Journal articles: 'Antioxidant activities'

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Martic, Sanela. "Phenolic Antioxidants: Redox Properties and Antioxidant Activities." ECS Meeting Abstracts MA2020-01, no. 43 (May 1, 2020): 2497. http://dx.doi.org/10.1149/ma2020-01432497mtgabs.

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Hou, J. P., H. Wu, Y. Wang, and X. C. Weng. "Isolation of some compounds from nutmeg and their antioxidant activities." Czech Journal of Food Sciences 30, No. 2 (March 9, 2012): 164–70. http://dx.doi.org/10.17221/509/2010-cjfs.

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Six compounds, licarin-B (1), dehydrodiisoeugenol (2), malabaricone B (3), malabaricone C (4), β-sitosterol (5), and daucosterol (6) were isolated from the seed (nutmeg) of Myristica fragrans Houtt and identified. Among them, malabaricone B was identified for the first time in nutmeg. Antioxidant activities of the isolated compounds were studied using oil stability index (OSI), reducing power, ABTS●+ scavenging, and DPPH● scavenging methods. The results showed that Malabaricone C is an efficient antioxidant agent which exhibits a stronger antioxidant activity than the commonly used synthetic antioxidants in all studied methods. This compound may have a potential to be used as a natural antioxidant in food.

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Kancheva, V. D., L. Saso, S. E. Angelova, M. C. Foti, A. Slavova-Kasakova, C. Daquino, V. Enchev, O. Firuzi, and J. Nechev. "Antiradical and antioxidant activities of new bio-antioxidants." Biochimie 94, no. 2 (February 2012): 403–15. http://dx.doi.org/10.1016/j.biochi.2011.08.008.

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Liu, Qing, Guo-Yi Tang, Cai-Ning Zhao, Xiao-Ling Feng, Xiao-Yu Xu, Shi-Yu Cao, Xiao Meng, Sha Li, Ren-You Gan, and Hua-Bin Li. "Comparison of Antioxidant Activities of Different Grape Varieties." Molecules 23, no. 10 (September 23, 2018): 2432. http://dx.doi.org/10.3390/molecules23102432.

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Grapes are widely consumed in the world, and different grape varieties could exhibit distinctly different antioxidant activities. In this study, the free radical-scavenging and antioxidant activities of lipophilic, hydrophilic, and insoluble-bound fractions from 30 grape varieties were evaluated by ferric-reducing antioxidant powers (FRAP), Trolox equivalent antioxidant capacities (TEAC), total phenolic contents (TPC), and total flavonoid contents (TFC). The results indicated that the 30 grape varieties exhibited diverse FRAP values (1.289–11.767 μmol Fe(II)/g FW), TEAC values (0.339–4.839 μmol Trolox/g FW), TPC values (0.294–1.407 mg GAE/g FW) and TFC values (0.082–0.132 mg QE/g FW). Several grapes, such as Pearl Black Grape (Xinjiang), Summer Black Grape (Shaanxi), Pearl Green Grape (Xinjiang), Seedless Green Grape (Xinjiang), and Seedless Red Grape (Yunnan), exhibited strong free radical-scavenging and antioxidant activities, which could be consumed as good sources of natural antioxidants to prevent several diseases induced by oxidative stress, such as cardiovascular disease and cancer. Furthermore, several antioxidants were identified and quantified, including caffeic acid, catechin gallate, epicatechin, gallic acid, protocatechuic acid and rutin, which could contribute to the antioxidant activities of grapes.

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Somsila, Pimchanok, Uthai Sakee, Akeapot Srifa, and Watchara Kanchanarach. "Antioxidant and Antimicrobial Activities of Polycephalomyces nipponicus." Journal of Pure and Applied Microbiology 12, no. 2 (June 30, 2018): 567–76. http://dx.doi.org/10.22207/jpam.12.2.15.

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Ohkatsu, Yasukazu, Sachiko Kubota, and Takuma Sato. "Antioxidant and Photo-antioxidant Activities of Phenylpropanoids." Journal of the Japan Petroleum Institute 51, no. 6 (2008): 348–55. http://dx.doi.org/10.1627/jpi.51.348.

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Xu, Qing, Tian Zhong, and Hui Li Li. "Antioxidant and Free Radical Scavenging Activities of N-Modified Chitosans." Advanced Materials Research 1002 (August 2014): 91–98. http://dx.doi.org/10.4028/www.scientific.net/amr.1002.91.

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Recently, the search for effective natural antioxidants use in food and medicinal fields to replace synthetic ones has attracted the most attention. Chitosan, a natural nontoxic biopolymer, is known to possess antioxidant property, which is attributed that NH2 and OH attached in the pyranose ring react with unstable free radicals to form stable macromolecule radicals. It has been observed that the antioxidant activity of chitosan is closely related to the form of nitrogen atom in the molecules. This review focuses on the antioxidant and free radical scavenging activities of various nitrogen atom of chitosan, including N-acylated chitosans, Schiff bases of chitosan, N-alkyl chitosan, and N-quaternized chitosan. The free radical scavenging mechanisms are summarized and the effects on free radical scavenging activity of N-modified chitosan are discussed. This work may provide more insights into the antioxidant ability of N-modified chitosans and potentially enable them to be used as natural antioxidants for application in food, agriculture, cosmetic and biomedical science. Keywords: N-modified chitosan, Sythesis, Antioxidant, Free radical scavenging

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FUJIMOTO, Kenshiro, Hiroko OHMURA, and Takashi KANEDA. "Biological antioxidant activities of bromophenols and certain other antioxidants." Agricultural and Biological Chemistry 50, no. 1 (1986): 101–8. http://dx.doi.org/10.1271/bbb1961.50.101.

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Fujimoto, Kenshiro, Hiroko Ohmura, and Takashi Kaneda. "Biological Antioxidant Activities of Bromophenols and Certain Other Antioxidants." Agricultural and Biological Chemistry 50, no. 1 (January 1986): 101–8. http://dx.doi.org/10.1080/00021369.1986.10867342.

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Lee, Choon Young, Ajit Sharma, Julius Semenya, Charles Anamoah, Kelli N. Chapman, and Veronica Barone. "Computational Study of Ortho-Substituent Effects on Antioxidant Activities of Phenolic Dendritic Antioxidants." Antioxidants 9, no. 3 (February 25, 2020): 189. http://dx.doi.org/10.3390/antiox9030189.

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Antioxidants are an important component of our ability to combat free radicals, an excess of which leads to oxidative stress that is related to aging and numerous human diseases. Oxidative damage also shortens the shelf-life of foods and other commodities. Understanding the structure–activity relationship of antioxidants and their mechanisms of action is important for designing more potent antioxidants for potential use as therapeutic agents as well as preservatives. We report the first computational study on the electronic effects of ortho-substituents in dendritic tri-phenolic antioxidants, comprising a common phenol moiety and two other phenol units with electron-donating or electron-withdrawing substituents. Among the three proposed antioxidant mechanisms, sequential proton loss electron transfer (SPLET) was found to be the preferred mechanism in methanol for the dendritic antioxidants based on calculations using Gaussian 16. We then computed the total enthalpy values by cumulatively running SPLET for all three rings to estimate electronic effects of substituents on overall antioxidant activity of each dendritic antioxidant and establish their structure–activity relationships. Our results show that the electron-donating o-OCH3 group has a beneficial effect while the electron-withdrawing o-NO2 group has a negative effect on the antioxidant activity of the dendritic antioxidant. The o-Br and o-Cl groups did not show any appreciable effects. These results indicate that electron-donating groups such as o-methoxy are useful for designing potent dendritic antioxidants while the nitro and halogens do not add value to the radical scavenging antioxidant activity. We also found that the half-maximal inhibitory concentration (IC50) values of 2,2-diphenyl-1-picrylhydrazyl (DPPH) better correlate with the second step (electron transfer enthalpy, ETE) than the first step (proton affinity, PA) of the SPLET mechanism, implying that ETE is the better measure for estimating overall radical scavenging antioxidant activities.

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Imelda, Eva, Rinaldi Idroes, Khairan Khairan, Rodiah Rahmawaty Lubis, Abdul Hawil Abas, Ade John Nursalim, Mohamad Rafi, and Trina Ekawati Tallei. "Natural Antioxidant Activities of Plants in Preventing Cataractogenesis." Antioxidants 11, no. 7 (June 28, 2022): 1285. http://dx.doi.org/10.3390/antiox11071285.

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A cataract is a condition that causes 17 million people to experience blindness and is the most significant cause of vision loss, around 47.9%. The formation of cataracts is linked to both the production of reactive oxygen species (ROS) and the reduction of endogenous antioxidants. ROS are highly reactive molecules produced by oxygen. Examples of ROS include peroxides, super-oxides, and hydroxyl radicals. ROS are produced in cellular responses to xenobiotics and bacterial invasion and during mitochondrial oxidative metabolism. Excessive ROS can trigger oxidative stress that initiates the progression of eye lens opacities. ROS and other free radicals are highly reactive molecules because their outer orbitals have one or more unpaired electrons and can be neutralized by electron-donating compounds, such as antioxidants. Examples of natural antioxidant compounds are vitamin C, vitamin E, and beta-carotene. Numerous studies have demonstrated that plants contain numerous antioxidant compounds that can be used as cataract preventatives or inhibitors. Natural antioxidant extracts for cataract therapy may be investigated further in light of these findings, which show that consuming a sufficient amount of antioxidant-rich plants is an excellent approach to cataract prevention. Several other natural compounds also prevent cataracts by inhibiting aldose reductase and preventing apoptosis of the eye lens.

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Krpan, M., K. Marković, G. Šarić, B. Skoko, M. Hruškar, and N. Vahčić. "Antioxidant Activities and Total Phenolics of Acacia Honey." Czech Journal of Food Sciences 27, Special Issue 1 (June 24, 2009): S245—S247. http://dx.doi.org/10.17221/1112-cjfs.

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The antioxidant activities and total phenolic content of 30 samples of acacia honey from Croatian territory were analysed. Phenolics were determined by the modified Folin-Ciocalteu method, antiradical activity by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) method and potential antioxidant activity using the ferric reducing antioxidant power (FRAP) method. In all samples, physicochemical parameters (water content, electrical conductivity, total reducing sugars, sucrose content, acidity, hydroxymethylfurfural content, prolin content, optical rotation, diastase activity and invertase activity) were measured according to Croatian legislation and International regulatory standards. Honey can be considered as a dietary supplement as it contains some important components including α-tocopherol, ascorbic acid, flavonoids and phenolics. The composition and properties of honey are dependent on floral origins, climatic conditions of the produced area, processing and storage methods. The results of physicochemical analyses showed that all the values of investigated parameters are in agreement with the current legislation. Phenolic content ranged from 31.72 mg/kg to 80.11 mg/kg, antiradical activity expressed as IC50 ranged from 61.28% to 253.47% and antioxidant activity expressed as FRAP value from 6.95 to 142.43. A positive correlation was observed between total phenolic content and antioxidant activity, indicating that phenolic compounds are mainly responsible for the antioxidant power of acacia honey.

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Zhang, Gui Zhi, Bao Ping Ji, and Gang Chen. "Antioxidant Activities and Phenolic Composition of Apple Peel, Core and Flesh Extracts on Selected Apple Cultivars." Advanced Materials Research 554-556 (July 2012): 1103–9. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.1103.

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Phenolic antioxidants have multiple benefits to human health. Polyphenols are responsible for the antioxidant activity in apples. Antioxidant activities were assessed using the ferric reducing/antioxidant power (FRAP) and 2,2-dipheny l-1-picrylhydrazyl (DPPH) radical scavenging assays in different cultivars and different parts of apples grown in China. The phenolic compounds and antioxidant activities differed significantly among the four apple cultivars. Guoguang had the highest phenolic concentration and antioxidant activity and Golden Delicious had the lowest. The peels had the highest total phenolic and flavonoid contents followed by the cores and flesh. Anthocyanins were detected only in red apple peels. Peel and core had greater antioxidant activities than apple flesh. FRAP values were inversely correlated with phenolic contents, whereas no clear relationship could be observed between DPPH values and phenolic contents. The higher levels of phenolic compounds and antioxidant activities of apple peels and cores than flesh may be of technological interest as a valuable source of antioxidants.

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Singh, Priyanshi, T. S. Naqvi, and R. K. Singh. "Antioxidant and Antitumor Activities of Leaf Extract of Eclipta Alba." Universities' Journal of Phytochemistry and Ayurvedic Heights I, no. 32 (June 18, 2022): 1–4. http://dx.doi.org/10.51129/ujpah-2022-32-1(3).

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Abstract –Medicinal plants are nature’s hidden and unexplored treasures (nature’s pharmacy) for humanity since times immemorial. The plant EcliptaAlba has many medicinal value used in the traditional Ayurvedic and Unani System.EcliptaAlba (L.) commonly known as bhringraj as well as false daisy, a species of plant in the family Asteraceae.This herb contains many bioactive components such as coumestans i.e. wedelolactone anddimethyl wedelolactone, flavonoids, stero- ids, etc. We have examined it antioxidant activity through DPPH & reducing power assay and we got in it total phenolic content, flavonoids and sterol as good antioxident agents. The antioxidant activity was assessed through DPPH and reducing power assay, which was explained in terms of effective concentration EC50/IC50.

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Nguyen, D. V., M. Takácsová, M. N. Dang, and K. Kristiánová. "Antioxidant activities of allspice extracts in rapeseed oil." Czech Journal of Food Sciences 18, No. 2 (January 1, 2000): 49–51. http://dx.doi.org/10.17221/8308-cjfs.

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Spices are an important component of both commercial and homemade foods. Many spices have been shown to possess an antioxidant effect. In our study, we tested the activity of different allspice extracts (ethanol, chloroform, diethylether, benzene and hexane) on the stability of rapeseed oil. The order of antioxidant effectiveness was as follows: ethanol extract > chloroform extract> diethylether extract > benzene extract > hexane extract. The ethanol extract exhibited a remarkable antioxidant effect.

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Bahorun, T., F. Trotin, J. Pommery, J. Vasseur, and M. Pinkas. "Antioxidant Activities ofCrataegus monogynaExtracts." Planta Medica 60, no. 04 (August 1994): 323–28. http://dx.doi.org/10.1055/s-2006-959493.

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Ohkatsu, Yasukazu, Tetsuto Kajiyama, and Yuji Arai. "Antioxidant activities of tocopherols." Polymer Degradation and Stability 72, no. 2 (May 2001): 303–11. http://dx.doi.org/10.1016/s0141-3910(01)00022-2.

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18

Iwatsuki, Misato, Erika Komuro, Yorihiro Yamamoto, Etsuo Niki, Caroline A. Gee, and Robin L. Wilson. "Antioxidant activities of aminophenols." Free Radical Biology and Medicine 9 (January 1990): 23. http://dx.doi.org/10.1016/0891-5849(90)90254-g.

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Patro, Birija S., Gajanan J. Chintalwar, and Subrata Chattopadhyay. "Antioxidant activities ofSwertia decussataxanthones." Natural Product Research 19, no. 4 (June 2005): 347–54. http://dx.doi.org/10.1080/14786410412331280032.

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Ku, Kang-Mo, He-Sook Kim, Byung-Su Kim, and Young-Hwa Kang. "Antioxidant Activities and Antioxidant Constituents of Pepper Leaves from Various Cultivars and Correlation between Antioxidant Activities and Antioxidant Constituents." Journal of Applied Biological Chemistry 52, no. 2 (June 30, 2009): 70–76. http://dx.doi.org/10.3839/jabc.2009.013.

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Pirlak, Lütfi, Gülüstan Ünüvar, and Nilda Ersoy. "Determination of antioxidant activities of some apple cultivars." Horticultural Science 44, No. 3 (September 7, 2017): 120–25. http://dx.doi.org/10.17221/276/2015-hortsci.

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This study was conducted in order to determine the antioxidant activities of certain apple varieties. ‘Galaxy Gala’, ‘Scarlet Spur’, ‘Fuji’, ‘Pink Lady’ and ‘Granny Smith’ were characterized in this study. The antioxidant activities among the varieties were determined via three different procedures. Antiradical activity figures of the apple varieties were between 0.592 (‘Galaxy Gala’) and 0.802 (‘Scarlet Spur’). Inhibition levels of chelating activity with Fe+2 varied between 40.20–55.50%; ‘Scarlet Spur’ and ‘Pink Lady’ extracts had the highest inhibition with 55.50% and ‘Granny Smith’ extract had the lowest with the level. Among the extracts showing H2O2 clearance effect, Granny Smith (62.54%) and Scarlet Spur (44.67%) extracts had the highest inhibition levels. In this study conducted on apple varieties, total phenolic matter levels were determined in ‘Scarlet Spur’, ‘Pink Lady’, ‘Fuji’, ‘Galaxy Gala’ and ‘Granny Smith’.

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Gupta, Rahul Kumar, and Meena Shamrao Deogade. "Antioxidant Activities of Martynia annua Linn. Root Extract." International Journal of Ayurvedic Medicine 10, no. 4 (January 14, 2020): 326–28. http://dx.doi.org/10.47552/ijam.v10i4.1327.

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Background: Antioxidants play a significant role to protect harm caused by oxidative stress (OS). Plants having phenolic substances are reported to possess antioxidant properties. The present study was intended to research the antioxidant potential of aqueous extract, Hydroalcoholic extract and Alcoholic extract from Martynia annua root. Martynia annua (cat’s claw, bichu) belongs to Martyniaceae family. For centuries, extracts of leaves, roots, stems, roots and seeds of M. annua have been used to cure eplilepsy, inflammation, tuberculosis, skin infections etc. Methods: The antioxidant activities of Aqueous, Hydroalcoholic and Alcoholic extractives were evaluated by using DPPH free radical assay. DPPH (1,1-diphenyl-2-picrylhydrazyine) free radical analysis is one of the accurate and frequently employed method for evaluating antioxidant activity. Results: Aqueous, Hydroalcoholic and Alcoholic extracts of Martynia annua root were explored which revealed that with increase in concentration of extracts resulted in increased degree of reduction. The IC50 values were calculated for all three extracts. Ascorbic acid was used as control. Martynia annua exhibited IC50 of 69.58±3.44µg/ml, 70.91±2.91µg/ml & 68.49±3.15µg/ml for Hydro-alcoholic extract, aqueous extract & ethanolic extract respectively while Ascorbic acid exhibited IC 50 of 62.91±2.85µg/ml. Conclusions: Scientific evidence suggests that antioxidants reduce the risk for chronic diseases including cancer and heart disease and infectious diseases. Further evaluation of pharmacological activities and cell line studies of Martynia annua may prove useful in treatment of cancer and heart diseases.

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GÖYCINCIK, Sezer, and Hatice DANAHALİLOĞLU. "Antioxidant and Antibacterial Activities of Salen-type Schiﬀ Base and Metal Complexes." Bitlis Eren Üniversitesi Fen Bilimleri Dergisi 12, no. 2 (June 8, 2023): 329–36. http://dx.doi.org/10.17798/bitlisfen.1185118.

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2-Aminobenzylamine based unsymmetrical salen type Schiﬀ base and its Cu(II), Ni(II),Co(II) and Fe(III) metal complexes were researched in terms of their antioxidant and antibacterial activities in this study. 1,1-Diphenyl-2-picrylhydrazyl radical scavenging (DPPH) method, ferric reducing antioxidant power (FRAP) method and cupric reducing antioxidant capacity (CUPRAC) method were carried out for determination of antioxidant effects of compounds. The antioxidant activity of the compounds were compared with the standard antioxidants butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT). Fe, Ni and Cu complexes exhibited more scavenging activity than BHT. All compounds exhibit lower ferric reducing activity than BHA and BHT. Fe complex, Ni complex and the ligand have more antioxidant capacity than corresponding to BHT according to CUPRAC method. These assays showed that all compounds researched can use as synthetic antioxidants. Antibacterial effects of Schiﬀ base and its metal complexes were investigated by agar disc diffusion method. Antibacterial studies of the compounds were achieved against some gram-positive and gram-negative bacteria. Enterococcus faecium, Pseudomonas aeroginosa, Klebsiella pneumoniae and Escherichia coli were used as bacterial strains. The beneficial datas were acquired.

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Devi, Khoirom Ratipiyari, Paonam Priyobrata Singh, Moirangthem Medhapati Devi, and Gurumayum Jitendra Sharma. "Evaluation of Antioxidant Activities of Alpinia galanga (L.) Willd." Biosciences Biotechnology Research Asia 15, no. 4 (November 7, 2018): 899–908. http://dx.doi.org/10.13005/bbra/2700.

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Present research was designed to evaluate the free radical scavenging capacities and antioxidant activities of rhizome extracts of Alpinia galanga prepared in different solvent systems (60% aqueous methanol, 60% aqueous ethanol and distilled water) using different in vitro chemical assays. Antioxidant components such as total phenolic content (TPC), total flavonoid content (TFC) and ascorbic acid contents of the ginger species were screened. Antioxidant assays employed included sulphur free radical reactivity assay, ferric ion reducing power assay, DPPH free radical scavenging capacity assay, hydroxyl radical scavenging assay, nitric oxide scavenging activity assay and hydrogen peroxide scavenging assay. The obtained data reveal that the plant extracts contained significant amount of the observed antioxidant components and also exhibited significant free radical scavenging capacities. Methanol (60%) extract exhibited highest antioxidant activity than other solvents. The polyphenolic constituents of the plant extracts appear to be largely responsible for the radical scavenging capacity. The plant extracts act as promising source of antioxidants, and may be useful for development of nutraceuticals and pharmaceutical drugs.

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Prasad, K. Nagendra, Jing Hao, Chun Yi, Dandan Zhang, Shengxiang Qiu, Yueming Jiang, Mingwei Zhang, and Feng Chen. "Antioxidant and Anticancer Activities of Wampee (Clausena lansium(Lour.) Skeels) Peel." Journal of Biomedicine and Biotechnology 2009 (2009): 1–6. http://dx.doi.org/10.1155/2009/612805.

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Antioxidant activities of wampee peel extracts using five different solvents (ethanol, hexane, ethyl acetate, butanol and water) were determined by using in-vitro antioxidant models including total antioxidant capability, 1,1-diphenyl-2-picryl hydrazyl (DPPH) radical scavenging activity, reducing power, and superoxide scavenging activity. Ethyl acetate fraction (EAF) exhibited the highest antioxidant activity compared to other fractions, even higher than synthetic antioxidant butylated hydroxyl toluene (BHT). In addition, the EAF exhibited strong anticancer activities against human gastric carcinoma (SGC-7901), human hepatocellular liver carcinoma (HepG-2) and human lung adenocarcinoma (A-549) cancer cell lines, higher than cisplatin, a conventional anticancer drug. The total phenolic content of wampee fraction was positively correlated with the antioxidant activity. This is the first report on the antioxidant and anticancer activities of the wampee peel extract. Thus, wampee peel can be used potentially as a readily accessible source of natural antioxidants and a possible pharmaceutical supplement.

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Cheng, Shuang, Fei He, Longyang Fu, and Yadong Zhang. "Polysaccharide from rubescens: extraction, optimization, characterization and antioxidant activities." RSC Advances 11, no. 31 (2021): 18974–83. http://dx.doi.org/10.1039/d1ra01365c.

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Rubescens polysaccharide was extracted and extraction conditions were optimized. Polysaccharide was structurally elucidated and its antioxidant activity was investigated. Rubescens polysaccharide has the potential for the natural antioxidants.

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Chanderraj, Pradeep, and Lalitha Sundaram. "In vitro antioxidant activities and molecular docking of Cassia auriculata medicinal plant." Research Journal of Biotechnology 18, no. 1 (December 15, 2022): 107–11. http://dx.doi.org/10.25303/1801rjbt1070111.

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In global health statistics, cancer and inflammatory diseases are on the upswing and are among the leading causes of death. Such health issues have emerged as a major national health concern across the globe. As a result, this research looked at the use of medicinal plants in the having antioxidant and docking analysis. The objective of this network pharmacology study is to identify the possible targets and mechanisms of action for the bioactive constituents in Cassia auriculata. Data from present results revealed that Cassia auriculata acts as an antioxidant agent due to its free radical scavenging and molecular docking. All the results of the in vitro antioxidant assays revealed antioxidant and free radical scavenging potential of leaf extract compared with standard antioxidants SOD. This antioxidant activity may be endorsed to its high phenolic contents. Thus, our findings provide evidence that Cassia auriculata is a potential source of natural antioxidants. The intermolecular interactions and binding energies of the compounds containing 1U6D bioactive compounds showed significant interactions with active site residues.

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Madhab, Mausomi, Chhavi Mangla, S. Vijaya, Devidas Narhar Patil, Renju Ammu Joseph, S. Anuradha, Madhuri Rajendra Ekashinge, et al. "Different Biological Activities Especially Antioxidant Activity of Plant Based Functional Foods for Human Health." International Journal of Membrane Science and Technology 10, no. 4 (September 19, 2023): 2419–23. http://dx.doi.org/10.15379/ijmst.v10i4.3507.

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In recent years, the interest in plant-based functional foods with various biological activities, especially antioxidant properties, has grown exponentially due to their potential health benefits. Antioxidants play a crucial role in neutralizing harmful free radicals, which are reactive molecules that can cause cellular damage and contribute to various chronic diseases. Natural antioxidants are abundant in food and medicinal plants. These natural antioxidants, particularly polyphenols and carotenoids, have a variety of biological benefits, including anti-inflammatory, anti-aging, anti-atherosclerosis, and anticancer properties (Xu et al ., 2017). Fruits and vegetables are excellent sources of antioxidants because they contain a variety of antioxidant components. Fruits and vegetables have varying levels of antioxidant activity. Each fruit and vegetable contains a distinct type of antioxidant, and this might vary from species to species as well as climate to climate (Ravimannan et al ., 2017). The paper discusses the underlying principles of oxidative stress and the mechanisms by which antioxidants counteract its effects (Fang et al ., 2002). It delves into the various classes of antioxidants found in plant-based foods, such as polyphenols, carotenoids, flavonoids, vitamins (e.g., vitamin C and E), and trace minerals (e.g., selenium and zinc), explaining their diverse roles in protecting cells from oxidative damage (Peng et al., 2014). In this chapter we emphasize the vital role of plant-based functional foods as a source of natural antioxidants, contributing to the promotion of human health and well-being. Incorporating a diverse array of antioxidant-rich plant foods into the daily diet is crucial for supporting overall health and preventing chronic diseases.

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Ohkatsu, Yasukazu, and Takuma Satoh. "Antioxidant and Photo-antioxidant Activities of Chalcone Derivatives." Journal of the Japan Petroleum Institute 51, no. 5 (2008): 298–308. http://dx.doi.org/10.1627/jpi.51.298.

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Li, Peiyuan, Lini Huo, Wei Su, Rumei Lu, Chaocheng Deng, Liangquan Liu, Yongkun Deng, Nana Guo, Chengsheng Lu, and Chunling He. "Free radical-scavenging capacity, antioxidant activity and phenolic content of Pouzolzia zeylanica." Journal of the Serbian Chemical Society 76, no. 5 (2011): 709–17. http://dx.doi.org/10.2298/jsc100818063l.

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Pouzolzia zeylanica was extracted with different solvents (acetone, ethyl acetate and petroleum ether), using different protocols (cold-extraction and Soxhlet extraction). To evaluate the antiradical and antioxidant abilities of the extracts, four in vitro test systems were employed, i.e., DPPH, ABTS and hydroxyl radical scavenging assays and a reducing power assay. All extracts exhibited outstanding antioxidant activities that were superior to that of butylated hydroxytoluene. The ethyl acetate extracts exhibited the most significant antioxidant activities, and cold-extraction under stirring seemed to be the more efficacious method for acquiring the predominant antioxidants. Furthermore, the antioxidant activities and total phenolic (TP) content of different extracts followed the same order, i.e., there is a good correlation between antioxidant activities and TP content. The results showed that these extracts, especially the ethyl acetate extracts, could be considered as natural antioxidants and may be useful for curing diseases arising from oxidative deterioration.

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Aini, Nur, Bambang Purwono, and Iqmal Tahir. "STRUCTURE – ANTIOXIDANT ACTIVITIES RELATIONSHIP ANALYSIS OF ISOEUGENOL, EUGENOL, VANILIN AND THEIR DERIVATIVES." Indonesian Journal of Chemistry 7, no. 1 (June 15, 2010): 61–66. http://dx.doi.org/10.22146/ijc.21714.

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Structure Activity Relationship (SAR) technique between the theoretical parameters and antioxidant activities of isoeugenol, eugenol, vanillin and their derivatives as Mannich reaction products, have been analyzed. Antioxidant activities were examined by oxidation reaction of oleic acid at 60 °C with b-carotene methods, whereas theoretical parameters of the activities were determined by calculating Bonding Dissociation Enthalpy (BDE) and net charge of oxygen atom(-OH) using AM1 semi empiric methods. The result from both test showed in the following orders: BHT > Mannich product of isoeugenol > isoeugenol > Mannich product of eugenol > eugenol > Mannich product of vanillin > vanillin. The antioxidant activities increase with small the BDE value and high the net charge. Electron donating groups will increase the antioxidants activity with lowering the BDE value and increasing the net charge, while electron-withdrawing groups will decrease antioxidants activity. Keywords: SAR, antioxidants, Bonding Dissociation Entalphy, eugenol.

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YILMAZ, SEBAHAT, BERTAN BORAN BAYRAK, and REFIYE YANARDAG. "In vitro Angiotensin Converting Enzyme Inhibitory and Antioxidant Activities of Some Sulfur Compounds." Romanian Biotechnological Letters 27, no. 1/2022 (January 10, 2022): 3252–63. http://dx.doi.org/10.25083/rbl/27.1/3252-3263.

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The angiotensin converting enzyme (ACE) catalyzes the conversion of angiotensin I to a key vasoconstrictor angiotensin II in renin-angiotensin system (RAS), thus playing an important role in both regulating blood pressure and maintaining fluid balance through RAS. Free radicals are continuously produced in the biological system. Therefore, organisms need both exogenous and endogenous antioxidants to guard against the damage caused by these free radicals. In this way, they prevent the occurrence of numerous diseases via protecting cellular components and biomolecules. The aim of the current study was to investigate the ACE inhibitory and antioxidant activities of sulfur compounds. The ACE inhibitory and antioxidant activities of all sulfur compounds increased in a concentration-dependent manner. Among these compounds, methionine had the highest ACE inhibitory and antioxidant activityes based on reducing power, DPPH radical scavenging and ORAC methods. Cystine had the highest ABTS radical scavenging, FRAP and nitrite scavenging activities. However, S-benzyl cysteine and S-phenyl cysteine exhibited the lowest ACE inhibitory and antioxidant activities, respectively. These outcomes indicate that sulfur compounds have both ACE inhibitory and antioxidant activities and may serve as gateways for research toward understanding the beneficial pharmacological effects of sulfur compounds against cell damage caused by oxidative stress.

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Cervellati, Rinaldo, Ester Speroni, Paolo Govoni, Maria Clelia Guerra, Stefano Costa, Ulrike W. Arnold, and Hermann Stuppner. "Wulfenia carinthiaca Jacq., Antioxidant and Pharmacological Activities." Zeitschrift für Naturforschung C 59, no. 3-4 (April 1, 2004): 255–62. http://dx.doi.org/10.1515/znc-2004-3-424.

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Relative antioxidant activities of a methanolic extract of three phenylpropanoid glycosides and three iridoid glycosides from Wulfenia carinthiaca were evaluated using the Briggs- Rauscher (BR) reaction method. This method is based on the inhibitory effects by antioxidants on oscillations of the BR reaction. The total extract showed a certain antioxidant activity with respect to resorcinol chosen as standard. The three phenylpropanoid glycosides showed a very high relative antioxidant activity while iridoid glycosides had practically no activity. These experimental results were confirmed by empirical calculations based on the BDE (Bond Dissociation Enthalpy) theory. The total phenolic content was also measured for the phenylpropanoid glycosides using the Folin-Ciocalteu reagent. The obtained values as gallic acid equivalents were in perfect agreement with the relative antioxidant activities. From a pharmacological point of view the results obtained demonstrate that the methanolic extract of W. carinthiaca have antinociceptive and antiedematogenic effects in the different models adopted. The plant extract produced a significant inhibition, dose related, of the rat paw edema induced by carrageenin. The anti-inflammatory activity is probably due to the phenylpropanoid compounds present in the plant. The histological sections of paw tissue in animals treated with Wulfenia carinthiaca extract confirmed the anti-inflammatory effects. The results of the antinociceptive assay indicated a significant reduction on the number of abdominal writhes of mice, induced by acetic acid.

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Sumandiarsa, I. Ketut, Nurul Hamida, Joko Santoso, and Kustiariyah Tarman. "Antioxidant activities from different parts of Sargassum polycystum thalli through ultrasound-assisted extraction (UAE) method." Omni-Akuatika 18, no. 2 (November 22, 2022): 79. http://dx.doi.org/10.20884/1.oa.2022.18.2.907.

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Sargassum polycystum is well known as macroalgae that contain active compounds with great function as antioxidants. The antioxidants content of the seaweed has links closely to phenolic compounds. The study is aimed to determine active compound quality from different thalli parts of S. polycystum extracted by Ultra-sound-assisted extraction (UAE). Fresh samples were prepared into three parts, which are apical, middle, and base thallus. Extraction was carried out by ultrasonication method and using 90% acetone as solvent. Levels of total phenols were analyzed using the Reagent Folin-Ciocalteu. Antioxidant activities were analyzed using DPPH, FRAP, and CUPRAC methods. The highest total phenolic content was found at the apical of the thallus, about 875.64 mg GAE/g. The most excellent DPPH antioxidant activities in S. polycystum were found from the apical part of the thallus with an IC 50 value of 38.49 ppm. The FRAP and CUPRAC antioxidant’s capacity showed the highest in the apical part of the thallus, which was 989.93 mol Fe (II)/g and 555.52 µmol Trolox/g, respectively. The extraction results of different parts of the thallus show highly potent active compounds of alkaloids, steroids, phenols, flavonoids, and potent antioxidants activity.Keywords: antioxidants, phytochemical, ultrasonication, S. polycystum

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Liu, Qing, Guo-Yi Tang, Cai-Ning Zhao, Ren-You Gan, and Hua-Bin Li. "Antioxidant Activities, Phenolic Profiles, and Organic Acid Contents of Fruit Vinegars." Antioxidants 8, no. 4 (March 27, 2019): 78. http://dx.doi.org/10.3390/antiox8040078.

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Fruit vinegars are popular condiments worldwide. Antioxidants and organic acids are two important components of the flavors and health benefits of fruit vinegars. This study aimed to test the antioxidant activities, phenolic profiles, and organic acid contents of 23 fruit vinegars. The results found that the 23 fruit vinegars varied in ferric-reducing antioxidant power (FRAP, 0.15–23.52 μmol Fe(II)/mL), Trolox equivalent antioxidant capacity (TEAC, 0.03–7.30 μmol Trolox/mL), total phenolic content (TPC, 29.64–3216.60 mg gallic acid equivalent/L), and total flavonoid content (TFC, 2.22–753.19 mg quercetin equivalent/L) values. Among the 23 fruit vinegars, the highest antioxidant activities were found in balsamic vinegar from Modena (Galletti), Aceto Balsamico di Modena (Monari Federzoni), red wine vinegar (Kühne), and red wine vinegar (Galletti). In addition, polyphenols and organic acids might be responsible for the antioxidant activities of fruit vinegars. The most widely detected phenolic compounds in fruit vinegars were gallic acid, protocatechuic acid, chlorogenic acid, caffeic acid, and p-coumaric acid, with tartaric acid, malic acid, lactic acid, citric acid, and succinic acid the most widely distributed organic acids. Overall, fruit vinegars are rich in polyphenols and organic acids and can be a good dietary source of antioxidants.

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Razab, Rasyidah, and Azlina Abdul Aziz. "Antioxidants from Tropical Herbs." Natural Product Communications 5, no. 3 (March 2010): 1934578X1000500. http://dx.doi.org/10.1177/1934578x1000500321.

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Plants that contain high amounts of polyphenolic compounds are potential candidates for natural antioxidant sources. Studies are on going in the search for new sources of antioxidants. Not much data are available on the antioxidant capacity of tropical herbs. With this in mind, 19 commonly consumed Malaysian herbs were analyzed for their polyphenolic content and antioxidant activities. A majority of these plants have never been studied before with regards to their polyphenolic content and antioxidant activities. The shoots of Anacardium occidentale, the shoots and fruits of Barringtonia racemosa, Pithecellobium jiringa and Parkia speciosa had high polyphenolic contents (> 150 μg gallic acid equivalents/mg dried plant) and antioxidant activities when measured using the ferric reducing antioxidant power (FRAP) (>1.2 mM) and Trolox equivalent antioxidant capacity (TEAC) assays (>2.4 mM). A strong correlation was observed between the two antioxidant assays (FRAP vs TEAC) implying that the plants could both scavenge free radicals and reduce oxidants. There was also a strong correlation between the antioxidant activities and polyphenolic content suggesting the observed antioxidant activities were contributed mainly by the polyphenolics in the plants.

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Seneviratne, K. N., and R. T. Kotuwegedara. "Antioxidant Activities of the Phenolic Extracts of Seed Oils and Seed Hulls of Five Plant Species." Food Science and Technology International 15, no. 5 (October 2009): 419–25. http://dx.doi.org/10.1177/1082013209352718.

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Antioxidant activities of the phenolic extracts of seed oils and seed hulls of five plant species were compared with those of butylated hydroxyl toluene (BHT) solutions at comparable phenolic concentrations in order to understand the phenolic dependence of the antioxidant activity and to evaluate the potentials of these phenolic extracts as alternatives for synthetic antioxidants. For this purpose, colorimetrically determined total phenol contents of the plant extracts were adjusted to known concentrations by suitable dilutions and the solutions of BHT with comparable concentrations were prepared by diluting a stock solution. The correlations of the total phenol contents and o-diphenol contents with the antioxidant activities of the phenolic extracts were also tested. Antioxidant activities of the phenolic extracts from different plants varied even at equal total phenol concentrations. o-Diphenol contents showed better correlations with the antioxidant activities than total phenol contents. A clear idea about the antioxidant potentials and the dependence of antioxidant activities on the quality and the quantity of phenolic substances can be obtained by comparison of the antioxidant activities of different phenolic extracts at equal total phenol concentrations.

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Nishiyama, T., T. Kagimasa, and F. Yamada. "Comparison of heteroatom-bridged analogues of methylenebisphenols for antioxidant activities." Canadian Journal of Chemistry 72, no. 5 (May 1, 1994): 1412–14. http://dx.doi.org/10.1139/v94-176.

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A series of methylenebisphenols, thiobisphenols, oxybisphenols, and iminobisphenols were evaluated as antioxidants for tetralin at 60 °C by means of an oxygen-obsorption method. It was found that replacement of the bridged methylene group of methylenebisphenols by a nitrogen atom showed considerably better antioxidant effects. The antioxidant effects of these compounds were influenced by the positions of the phenolic hydroxyl groups in their molecules.

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Nam, Tae-gyu, Jin-Mo Ku, Christopher L. Rector, Hoyoung Choi, Ned A. Porter, and Byeong-Seon Jeong. "Pyridoxine-derived bicyclic aminopyridinol antioxidants: synthesis and their antioxidant activities." Organic & Biomolecular Chemistry 9, no. 24 (2011): 8475. http://dx.doi.org/10.1039/c1ob05144j.

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Sutriah, Komar, Zainal Alim Mas’ud, and Tun Tedja Irawadi. "SYNTHESIS OF ZINC-DIFATTYALKYLDITHIOCARBAMATES AND THEIR ANTIOXIDANT ACTIVITIES." Indonesian Journal of Chemistry 12, no. 2 (June 4, 2012): 189–94. http://dx.doi.org/10.22146/ijc.21362.

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Zinc-difattyalkyldithiocarbamates are organosulfur compounds with many functions, including as an antioxidant in a lubrication system. They were synthesized by reacting secondary fatty amine with ZnCl2 and CS2 giving result zinc-difattyalkyldithiocarbamates of around 77-87%. The synthesized products were characterized using infrared (IR) spectroscopic techniques. The IR spectra of zinc-difattyalkyldithiocarbamates showed sharp bands at 1450-1550 cm-1 for thioureida v (C-N), 950-1050 cm-1 for v (C-S), and in the far-red area 300-400 cm-1 for sulfur-metal bond. Products recovery was evaluated by AAS and the purity was analyzed by HPLC. Seven variants of zinc-difattyalkyldithiocarbamates were obtained. Antioxidant activity was evaluated by rancimat test regarding their induction time. At 125 ppm levels all variants showed higher value in each of their induction time as compared to those of butylated hydroxyanisole and butylated hydroxytoluene, commercial antioxidants No.1, and commercial antioxidants no.2. Three variants, i.e. Zn-bis(dilauryl)dithiocarbamate, Zn-bis(laurylpalmityl)dithiocarbamate, and Zn-bis(laurylstearyl)dithiocarbamate had higher values in their induction time than the other variants. The values are 16.67, 26.54, and 16.11 h, respectively.

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Kong, Fansheng, Shujuan Yu, Feng Zeng, and Xinlan Wu. "Preparation of Antioxidant and Evaluation of the Antioxidant Activities of Antioxidants Extracted From Sugarcane Products." Journal of Food and Nutrition Research 3, no. 7 (October 13, 2015): 458–63. http://dx.doi.org/10.12691/jfnr-3-7-7.

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Hu, Xiao-Fang, Zong-Bao Ding, Yue Chen, Jiang-Fu Luo, Jian-Min He, and Tian-Peng Yin. "Comparative study on the antioxidant activities of ten common flower teas from China." Open Chemistry 17, no. 1 (October 16, 2019): 841–48. http://dx.doi.org/10.1515/chem-2019-0091.

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AbstractFlower teas are widely consumed across the world because of their beneficial health effects. The antioxidant activities of methanol extracts from ten common flower teas in China were evaluated using four antioxidant assays. The total phenolic (TPCs) and total flavonoid contents (TFCs) were also investigated. Most of these flower teas exhibited potent antioxidant effects, of which rosae rugosae flos exerted the strongest antioxidant effects in four assays. Rosae rugosae flos also exerted the highest TPC, while fragrans showed the highest TFC. Correction analysis indicated that phenolics play a key role in the antioxidant effect of flower teas, while flavonoids were poorly correlated with antioxidant activity. The results supported the consumption of flower teas as functional foods and their application as sources of natural antioxidants in the food industry.

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Fatoumata, Tounkara, Fane Mah Moutaga, Konare Mamadou Abdoulaye, and Traore Nah. "THE IN VITRO ANTIOXYDANT ACTIVITIES OF DEFATTED ROSELLE (HIBISCUS SABDARIFFA L.) SEED PROTEIN HYDROLYSATES." International Journal of Advanced Research 10, no. 01 (January 31, 2022): 187–96. http://dx.doi.org/10.21474/ijar01/14030.

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The aim of this study was to produce natural antioxidants from Roselle seed proteins. In recent years, the potential application of natural antioxidants as substitutes as drawn much interest due to their safety and wide distribution. Literature indicated that Roselle whole seeds contained high amounts of protein, oil and carbohydrate However, There is scanty scientific documentation on the protein hydrolysis and the study of antioxidant activities of the hydrolysates.Roselle seed protein isolate and Roselle seed protein fractions namely globulin, albumin and glutelin were digested using pepsin followed by pancreatinat different time in order to produce hydrolysates with good antioxidant activity suitable for conversion to high-value products. . The antioxidant activities of the hydrolysates were investigated using different in vitro methods. The prepared samples were as effective as antioxidants in model systems, in scavenging of free radicals, and acting as reducing agents. This effect was concentration-dependent and was also influenced by the type of proteins. Among all the hydrolysates, the 3 hours samples and particularly those of protein isolate showed the highest antioxidant activity followed by albumin fraction, Glutelin and Globulin hydrolysates respectively (Protein isolate>Albumin >Glutelin> Globulin hydrolysates)..The study confirmed that fraction with strong antioxidant activities from Roselle seed protein can be successfully provided through enzymatic digestion.

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Ali, Hamdy Elsayed Ahmed, Sanaa Mahmoud Metwally Shanab, Mervat Aly Mohamed Abo-State, Emad Ahmed Ahmed Shalaby, Usama Mohamed Nour El Demerdash, and Mohd Azmuddin Abdullah. "Determination of Antioxidant Activities and Total Phenolic Contents of Three Cyanobacterial Species." Applied Mechanics and Materials 625 (September 2014): 826–29. http://dx.doi.org/10.4028/www.scientific.net/amm.625.826.

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The antioxidant activity and total phenolic content of different extracts (hexane, chloroform, ethyl acetate, ethanol (70%) and water) of three tested cyanobacterial species (Phormidium sp., Oscillatoria sp. and Nostoc muscorum ) were evaluated, using 2,2 ́-diphenyl-1-picrylhydrazyl (DPPH) scavenging method and Folin–Ciocalteu method, respectively. The ethanolic extract of Oscillatoria sp. possessed the highest antioxidant activity (69.13±0.35 %) and therefore could be potential source of natural antioxidants. The correlation coefficients between the antioxidant activities and the phenolic contents were very small in most of extracts (R2 = 0.0291-0.2934). However, the water extract demonstrated relatively higher value (R2= 0.7446). Thus, phenolic compounds may not be considered the major contributors for the antioxidant activities of these cyanobacterial species. So, other antioxidant substances may be present in the extract and share in this activity.

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Nasrin, Fatema. "Antioxidant and cytotoxic activities of Ageratum conyzoides stems." International Current Pharmaceutical Journal 2, no. 2 (January 1, 2013): 33–37. http://dx.doi.org/10.3329/icpj.v2i2.13195.

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Modern civilization is facing more than hundreds of disorders associated with free radicals and natural antioxidants from non-edible plants are gaining importance to fight these disorders. The intention of this report is to evaluate a well known medicinal weed Ageratum conyzoides stems for its antioxidant and cytotoxic Effects. Antioxidant potentiality of the crude methanolic extract of the Ageratum conyzoides (AC) stems was investigated on DPPH scavenging activity, reducing ability, total antioxidant capacity as well as total phenolic contents. Cytotoxic study was done by brine shrimp lethality bioassay and vincristin sulphate was used as standard. The total phenols and total antioxidant capacity of AC was found to be 38.125 ± 2.01mg/g equivalent of gallic acid and 333.37 ± 4.22mg/gm equivalent of ascorbic acid, respectively. The percentage (%) scavenging of DPPH free radical of the extract was found to be concentration dependent with IC50 value 46.01 ± 2.23µg/ml while IC50 value of standard ascorbic acid was found to be 29.56 ± 0.11?g/ml. The reducing power of AC was found to be concentration dependent. The cytotoxicity exhibited by AC was found promising with LC50 value 1.32?g/ml, comparing with the LC50 (0.689?g/ml) values of vincristin sulphate. The present investigation suggests that Ageratum conyzoides possesses remarkable antioxidant and cytotoxic property.DOI: http://dx.doi.org/10.3329/icpj.v2i2.13195 International Current Pharmaceutical Journal 2013, 2(2): 33-37

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T, Tamilarasi, Malarvili T, Suganthi K, and Anitha C. "Evaluation of Reactive Oxygen and Nitrogen Species Scavenging Activities of Ulva lactuca." International Journal of Zoological Investigations 08, special issue (2022): 143–51. http://dx.doi.org/10.33745/ijzi.2022.v08i0s.018.

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The objective of current study was to evaluate in vitro antioxidant activities of ethanol extract of Ulva lactuca L. The DPPH, total antioxidant capacity, superoxide, hydroxyl, and nitric oxide radicals assays were used to determine the ethanol extract of U. lactuca's in vitro antioxidant activity. At different concentrations, the radical scavenging activity was measured. The high concentration of phytochemical components in U. lactuca extract may be the cause of its antioxidant properties. The Ulva lactuca is a significant source of natural antioxidants that may provide defence against illnesses caused by free radicals. Additionally, research is needed to isolate and characterise the algal active chemicals for use in in vivo tests and to understand their mechanisms of action

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Karlidag, Semiramis, Merve Keskin, Sinan Bayram, Nazlı Mayda, and Asli Ozkok. "Honey: Determination of volatile compounds, antioxidant and antibacterial activities." Czech Journal of Food Sciences 39, No. 3 (June 29, 2021): 208–16. http://dx.doi.org/10.17221/63/2021-cjfs.

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Honey is an important functional food for human health and nutrition that is collected by honey bees and stored in the honeycombs. In this study, total phenolic content, antioxidant activity and volatile compounds of 13 different honey samples collected from various districts of Malatya province were investigated. As a result of this study, it was determined that the total phenolic content varied between 8.50 mg GAE 100 g–1 and 73.90 mg GAE 100 g–1 and it was observed that the honey samples were rich in aldehydes, aliphatic acid and esters, alcohols, hydrocarbons, carboxylic acid esters, ketones, terpenes, fatty acids and esters. In addition, the antibacterial effects of honey samples were determined against 18 different pathogenic bacteria using agar well diffusion (AWD) method, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC). In AWD assay, it was recorded that inhibition zone diameters varied between 9 mm and 14 mm and honey samples were found to have a partial inhibitory effect against selected target pathogens.

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Huang, Y., Z. Jiang, X. Liao, J. Hou, and X. Weng. "Antioxidant activities of two novel synthetic methylbenzenediol derivatives ." Czech Journal of Food Sciences 32, No. 4 (July 29, 2014): 348–53. http://dx.doi.org/10.17221/283/2013-cjfs.

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2-(tert-Butyl)-5-methylbenzene-1,4-diol and 3-(tert-butyl)-5-methylbenzene-1,2-diol were synthesised by Friedel-Craft reaction of 2-methylbenzene-1,4-diol and 4-methylbenzene-1,2-diol, respectively, with tertiary butanol providing reasonable yields. The antioxidant activities of these two products, mother compounds and 2-(tert-butyl)benzene-1,4-diol were investigated and compared by means of 2,2-diphenyl-1-picrylhydrazyl radical and Rancim at test; 3-(tert-butyl)-5-methylbenzene-1,2-diol is the most potent antioxidant tested by using Rancimat test experiment. The 2,2-diphenyl-1-picrylhydrazyl radical scavenging abilities of 2-methylbenzene-1,4-diol, 4-methylbenzene-1,2-diol and 2-(tert-butyl)benzene-1,4-diol are almost equal and more than twice as strong as 2-(tert-butyl)-5-methylbenzene-1,4-diol and 3-(tert-butyl)-5-methylbenzene-1,2-diol. The antioxidant activities of the five compounds evaluated by Rancimat test mainly depend on their steric synergist effects between the two phenolic hydroxyl groups in their molecules. The antioxidant activities of the five compounds mainly depend on how many 2,2-diphenyl-1-picrylhydrazyl radicals can be scavenged by one mole of them in 2,2-diphenyl-1-picrylhydrazyl test. One mole of 2-methylbenzene-1,4-diol, 4-methylbenzene-1,2-diol and 2-(tert-butyl)benzene-1,4-diol can scavenge four moles of 2,2-diphenyl-1-picrylhydrazyl radicals, but one mole of 2-(tert-butyl)-5-methylbenzene-1,4-diol or 3-(tert-butyl)-5-methylbenzene-1,2-diol can only scavenge two mole 2,2-diphenyl-1-picrylhydrazyl radicals because 2,2-diphenyl-1-picrylhydrazyl radicals are very bulky.

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Singha, Harpreet, and Ramesh Kumari Dasgupta. "ANTIOXIDANT ACTIVITIES OF CRUDE EXTRACTS OF PULSATILLA NIGRICANS STOCK." INDIAN RESEARCH JOURNAL OF PHARMACY AND SCIENCE 4, no. 3 (September 2017): 1139–43. http://dx.doi.org/10.21276/irjps.2017.4.3.7.

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Pujiawati, Y., L. Khotijah, and IKG Wiryawan. "Screening of antioxidant activities and their bioavailability of tropical plants." IOP Conference Series: Earth and Environmental Science 1182, no. 1 (June 1, 2023): 012083. http://dx.doi.org/10.1088/1755-1315/1182/1/012083.

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Abstract Indonesia has many types of plants that have the potential to be used as natural antioxidants. This study aims to characterize natural sources of antioxidants from five plants species: jackfruit leaves, turmeric, black tea, soursop peels, and aloe vera. The method used involved an analysis of phytochemicals in the form of polyphenols, tannins, and flavonoids. As well as analysis of antioxidant activity using the DPPH method. The data obtained were analyzed by ANOVA (Analysis of Variance) and Duncan’s test. Based on these data, the highest yields were found in jackfruit leaves, turmeric, black tea, and aloe vera (P<0.05), while the lowest yields were found in soursop peels. Based on phytochemical data, the highest total phenol was found in jackfruit leaves and soursop skin (P<0.05). While the highest flavonoid content was found in black tea and aloe vera (P<0.05), and the highest tannin content was found in black tea and soursop skin. Based on the method of measuring antioxidant activity, it was found that jackfruit leaves and black tea had the highest antioxidant activity.

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Journal articles on the topic 'Antioxidant activities'

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