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Journal articles on the topic 'Quantification des radicaux'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Armatte, Michel. "Introduction aux travaux d’Alain Desrosières : histoire et sociologie de la quantification." Statistique et société 2, no. 3 (2014): 17–23. https://doi.org/10.3406/staso.2014.918.

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Alain Desrosières fut mon ami, mon collègue et mon partenaire privilégié dans une recherche dont je voudrais ici rendre compte, parce que, bien au-delà de ses qualités humaines, au-delà de l’histoire de la Statistique à laquelle il fut en France le premier à consacrer un ouvrage spécifique, il a développé une pensée originale sur l’analyse du rapport d’une société avec ses instruments de quantification (dont la statistique et la comptabilité), et cette pensée nous a libérés de l’alternative douloureuse des années 1970 consistant à en être tantôt les thuriféraires, admirateurs de leur puissance

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2

Schwarz-Selinger, T., V. Dose, W. Jacob, and A. von Keudell. "Quantification of a radical beam source for methyl radicals." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 19, no. 1 (2001): 101–7. http://dx.doi.org/10.1116/1.1326939.

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3

Blakley, Richard L., Dwight D. Henry, Walter T. Morgan, William L. Clapp, Carr J. Smith, and David Barr. "Quantitative Electron Paramagnetic Resonance: The Importance of Matching the Q-Factor of Standards and Samples." Applied Spectroscopy 55, no. 10 (2001): 1375–81. http://dx.doi.org/10.1366/0003702011953504.

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Electron paramagnetic resonance (EPR) quantification of free radicals from different samples facilitates comparison of free radical concentrations. Stable free radicals, such as 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO), in a suitable solvent (e.g., benzene) can be used as a quantification standard. Free radicals found in samples can be shorter lived than radicals in prepared standards and require stabilizing spin-trapping agents such as N-tert-butyl-α-phenylnitrone (PBN) in an appropriate solvent (e.g., benzene). Analysis in our laboratory showed that free radicals from spin-trapped sample

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Morgan, Christopher G., Mark M. Gleason, and Ronald Vane. "Quantification of Contaminant Removal by Evactron Cleaning Using Quartz Crystal Thickness Monitors." Microscopy Today 15, no. 5 (2007): 22–25. http://dx.doi.org/10.1017/s1551929500061198.

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Hydrocarbon (HC) contamination is a persistent problem for users of electron microscopes (EMs), often leading to image distortion and interference with nanoprobing. The Evactron De-Contaminator (D-C) has been available for HC contamination removal in EMs since 1999. The Evactron D-C uses low power radio frequency (RF) generated plasma in order to produce oxygen radicals that clean the EM. The Oxygen Radical Source (ORS) is attached to the EM chamber, and a controlled leak of oxygen containing gas such as room air is passed through the plasma in order to produce oxygen radicals. The oxygen radi

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Cho, Eun Chul, Ju A. La, Sora Lim, and Ji Eun Song. "Gold/Silver-Polymer Hybrid Nanostructures as Thermoreversible Optical Sensors and Probes for the Quantification Radical Compounds." MRS Proceedings 1802 (2015): 41–44. http://dx.doi.org/10.1557/opl.2015.833.

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ABSTRACTWe present gold (Au) and silver (Ag) nanoparticles (NPs) could be used not only for stimuli-responsive optical sensors but also for the quantification of radical compounds when these nanoparticles are suitably combined with polymeric materials. When Au NPs are assembled 2-dimensionally on the surface of hydrogel NPs which respond to temperatures, the hybrid NPs displayed thermoreversible multiple color switching. Accordingly, optical bandwidths of the hybrid NPs are reversibly changed with temperatures: with hybrid NPs assembled with 51 nm Au NPs, prominent optical signals are recorded

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6

Goyal, Parveen Kumar, Santosh Kumar Verma, and Anil Kumar Sharma. "Quantification of Total Phenolic and Flavonoid Contents, and Evaluation of Free Radical Scavenging Potential of Vernonia cinerea." Asian Pacific Journal of Health Sciences 4, no. 3 (2017): 279–87. http://dx.doi.org/10.21276/apjhs.2017.4.3.42.

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7

Koshiishi, Ichiro, Kazunori Tsuchida, Tokuko Takajo, and Makiko Komatsu. "Quantification of lipid alkyl radicals trapped with nitroxyl radical via HPLC with postcolumn thermal decomposition." Journal of Lipid Research 46, no. 11 (2005): 2506–13. http://dx.doi.org/10.1194/jlr.d500006-jlr200.

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8

Peralta, E., G. Roa, J. A. Hernandez-Servin, R. Romero, P. Balderas, and R. Natividad. "Hydroxyl Radicals quantification by UV spectrophotometry." Electrochimica Acta 129 (May 2014): 137–41. http://dx.doi.org/10.1016/j.electacta.2014.02.047.

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9

Hughes, H. M., I. M. George, J. C. Evans, C. C. Rowlands, G. M. Powell, and C. G. Curtis. "The role of the liver in the production of free radicals during halothane anaesthesia in the rat. Quantification of N-tert-butyl-alpha-(4-nitrophenyl)nitrone (PBN)-trapped adducts in bile from halothane as compared with carbon tetrachloride." Biochemical Journal 277, no. 3 (1991): 795–800. http://dx.doi.org/10.1042/bj2770795.

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Halothane or CCl4 was co-administered with the spin trap N-tert-butyl-alpha-(4-nitrophenyl)nitrone (PBN) to rats fitted with bile duct cannuli or to isolated perfused liver preparations. Rats maintained under halothane anaesthesia generated significant amounts of free radicals, and 5-9 nmol was excreted in bile over 1 h. No adducts were detected in urine or plasma. The hepatic origin of these free radicals was confirmed by studies on isolated perfused livers where the addition of halothane to the perfusate resulted in the biliary elimination of the same PBN-trapped radical adducts. Similarly,

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10

Gardner, Jonathan M., and Steven D. Aust. "Quantification of hydroxyl radical produced during phacoemulsification." Journal of Cataract & Refractive Surgery 35, no. 12 (2009): 2149–53. http://dx.doi.org/10.1016/j.jcrs.2009.06.030.

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11

Tanev, Mihail, Georgi Tomov, and Yordanka Karakirova. "EPR Spectroscopy Investigation of Oxygen Radical Production by Methylene Blue and Indocyanine Green in Aqueous Solutions under Laser Irradiation in the Context of Antibacterial Photodynamic Therapy." Folia Medica 63, no. 3 (2021): 372–76. http://dx.doi.org/10.3897/folmed.63.e52102.

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Introduction: Antibacterial photodynamic therapy is a promising treatment modality in the anti-infective therapy of numerous oral diseases. It involves photo activation of a reactive substance (dye), thus releasing reactive oxygen species (ROS-radicals) which are highly destructive to the bacterial cell. However, thorough investigation of radical production properties of different dyes is not common in literature.Aim: The aim of this study was to investigate and evaluate oxygen radical-producing potential of two commonly used photoactive dyes in the context of antibacterial photodynamic therap

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12

Fuchs, Hendrik, Sascha Albrecht, Ismail–Hakki Acir, et al. "Investigation of the oxidation of methyl vinyl ketone (MVK) by OH radicals in the atmospheric simulation chamber SAPHIR." Atmospheric Chemistry and Physics 18, no. 11 (2018): 8001–16. http://dx.doi.org/10.5194/acp-18-8001-2018.

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Abstract. The photooxidation of methyl vinyl ketone (MVK) was investigated in the atmospheric simulation chamber SAPHIR for conditions at which organic peroxy radicals (RO2) mainly reacted with NO (“high NO” case) and for conditions at which other reaction channels could compete (“low NO” case). Measurements of trace gas concentrations were compared to calculated concentration time series applying the Master Chemical Mechanism (MCM version 3.3.1). Product yields of methylglyoxal and glycolaldehyde were determined from measurements. For the high NO case, the methylglyoxal yield was (19 ± 3) % a

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Rutely C., Burgos Castillo, Fontmorin Jean-M., Tang Walter Z., Dominguez-Benetton Xochitl, and Sillanpää Mika. "Towards reliable quantification of hydroxyl radicals in the Fenton reaction using chemical probes." RSC Advances 8, no. 10 (2018): 5321–30. http://dx.doi.org/10.1039/c7ra13209c.

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14

Moussa, Senigra, Oum Elkhair Rahim, Rezkallah Chafika, Ammar Haouat, and Ghemam Amara Djilani. "Identification, quantification, and antioxidant capacity of active compounds in Fagonia cretica organic extracts." Brazilian Journal of Animal and Environmental Research 7, no. 4 (2024): e76066. https://doi.org/10.34188/bjaerv7n4-141.

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This study aims to identify and quantify the active compounds and antioxidant capacity for scavenging free radicals in the organic extracts of *Fagonia cretica*. Extracts were prepared based on the polarity differences of solvents from the dried plant material, starting with the hydromethanolic extract, followed by fractionation into n-hexane, chloroform, ethyl acetate, and 1-butanol, respectively. The following compounds were evaluated: saponins, tannins, steroids, terpenes, cardenolides, flavonoids, coumarins, saturated and unsaturated steroids, along with the estimation of phenolic and flav

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15

Taha, Youssef M., Matthew T. Saowapon, Faisal V. Assad, et al. "Quantification of peroxynitric acid and peroxyacyl nitrates using an ethane-based thermal dissociation peroxy radical chemical amplification cavity ring-down spectrometer." Atmospheric Measurement Techniques 11, no. 7 (2018): 4109–27. http://dx.doi.org/10.5194/amt-11-4109-2018.

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Abstract. Peroxy and peroxyacyl nitrates (PNs and PANs) are important trace gas constituents of the troposphere which are challenging to quantify by differential thermal dissociation with NO2 detection in polluted (i.e., high-NOx) environments. In this paper, a thermal dissociation peroxy radical chemical amplification cavity ring-down spectrometer (TD-PERCA-CRDS) for sensitive and selective quantification of total peroxynitrates (ΣPN = ΣRO2NO2) and of total peroxyacyl nitrates (ΣPAN = ΣRC(O)O2NO2) is described. The instrument features multiple detection channels to monitor the NO2 background

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16

Xu, Jing, Xinguo Wu, Wei Yan, Ruxiu Cai, and Zhixin Lin. "A new kinetic method for quantification phenoxyl free radicals." Talanta 70, no. 2 (2006): 323–29. http://dx.doi.org/10.1016/j.talanta.2006.02.055.

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17

Botelho, Ricardo Vieira, Matheus Fernandes de Oliveira, and Jose Marcus Rotta. "Quantification of Vertebral Involvement in Metastatic Spinal Disease." Open Orthopaedics Journal 7, no. 1 (2013): 286–91. http://dx.doi.org/10.2174/1874325001307010286.

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Introduction: For patients with a solitary and well-delimitated spinal metastasis that resides inside the vertebral body, without vertebral canal invasion, and who are in good general health with a long life expectancy, en bloc spondylectomy/total vertebrectomy combined with the use of primary stabilizing instrumentation has been advocated. However, clinical experience suggests that these qualifying conditions occur very rarely. Objective: The purpose of this paper is to quantify the distribution of vertebral involvement in spinal metastases and determine the frequency with which patients can

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Chatgilialoglu, Chryssostomos, Carla Ferreri, Nicholas E. Geacintov, et al. "5′,8-Cyclopurine Lesions in DNA Damage: Chemical, Analytical, Biological, and Diagnostic Significance." Cells 8, no. 6 (2019): 513. http://dx.doi.org/10.3390/cells8060513.

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Purine 5′,8-cyclo-2′-deoxynucleosides (cPu) are tandem-type lesions observed among the DNA purine modifications and identified in mammalian cellular DNA in vivo. These lesions can be present in two diasteroisomeric forms, 5′R and 5′S, for each 2′-deoxyadenosine and 2′-deoxyguanosine moiety. They are generated exclusively by hydroxyl radical attack to 2′-deoxyribose units generating C5′ radicals, followed by cyclization with the C8 position of the purine base. This review describes the main recent achievements in the preparation of the cPu molecular library for analytical and DNA synthesis appl

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19

Chiorcea-Paquim, Ana-Maria. "Electrochemical Sensing of Curcumin: A Review." Antioxidants 12, no. 12 (2023): 2029. http://dx.doi.org/10.3390/antiox12122029.

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Curcumin is a natural polyphenol derived from turmeric (Curcuma longa) root that has been used for centuries as a spice, coloring agent, and medicine. Curcumin presents anti-inflammatory, antioxidant, anticarcinogenic, antimicrobial, antiviral, antimalarial, hepatoprotective, thrombosuppressive, cardiovascular, hypoglycemic, antiarthritic, and anti-neurodegenerative properties. It scavenges different forms of free radicals and acts on transcription factors, growth factors and their receptors, cytokines, enzymes, and genes, regulating cell proliferation and apoptosis. Curcumin is electroactive,

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20

S., Selva Kumar*and J. Monica. "IN VITRO ANTIOXIDANT ACTIVITIES OF CHLOROFORM EXTRACT OF CTENOLEPSIS CERASIFORMIS." INDO AMERICAN JOURNAL OF PHARMACEUTICAL SCIENCES 05, no. 05 (2018): 3976–79. https://doi.org/10.5281/zenodo.1249939.

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The sources of many of the new drugs and active ingredients of medicines are derived from natural products. The starting point for plant-based new drug discovery should be identification of the right candidate plants by applying traditional system of medicine. In many cases, the people claim the good remedy of such kind of plant -based products or herbal products. Chromatographical methods of separations of bioactive principles from the plants are the most commonly used technique for the identification, quantification and characterisation purpose. Herbal medicinal plants are getting the paramo

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21

Fogarasi, Erzsébet, Mircea Dumitru Croitoru, Ibolya Fülöp, et al. "Malondialdehyde levels can be measured in serum and saliva by using a fast HPLC method with visible detection / Determinarea printr-o metodă HPLC-VIS rapidă a concentraţiilor serice şi salivare ale malondialdehidei." Revista Romana de Medicina de Laborator 24, no. 3 (2016): 319–26. http://dx.doi.org/10.1515/rrlm-2016-0029.

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Abstract Oxidative stress appears when the amount of free radicals that are formed in a living organism exceed its spin-trapping ability. One of the most dangerous free radicals that are formed in the human body is the hydroxyl radical. It can alter several biomolecules, including the unsaturated fatty acids; this process is known as lipid peroxidation and can lead to cell necrosis and generation of several harmful byproducts including malondialdehyde, which serves also as a biomarker of oxidative stress. A new HPLC method with visible detection was developed for the detection of malondialdehy

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ICHIKAWA, Kazuhiro, Sang-Kuk HAN, and Hideo UTSUMI. "Quantification of hydroxyl radical during ozonation in batch system." Journal of Japan Society on Water Environment 22, no. 11 (1999): 921–25. http://dx.doi.org/10.2965/jswe.22.921.

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23

Hu, Na, and Sarah A. Green. "Acetyl radical generation in cigarette smoke: Quantification and simulations." Atmospheric Environment 95 (October 2014): 142–50. http://dx.doi.org/10.1016/j.atmosenv.2014.06.027.

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24

Mitra, Indrani, Achintya Saha, and Kunal Roy. "Quantification of contributions of different molecular fragments for antioxidant activity of coumarin derivatives based on QSAR analyses." Canadian Journal of Chemistry 91, no. 6 (2013): 428–41. http://dx.doi.org/10.1139/cjc-2012-0527.

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Attempts have been made in the present work using in silico techniques for identification of essential structural features imparting antioxidant potential to naturally available coumarin molecules and their synthetic derivatives. Four different types of modeling tools have been employed for the qualitative and quantitative assessment of the molecular fragments constituting the biological pharmacophore. The descriptor-based quantitative structure–activity relationship (QSAR) and group-based QSAR (G-QSAR) models provide a quantitative estimation of the substituent requirements and the chemical n

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Wang, Wenjie, Jipeng Qi, Jun Zhou, et al. "The improved comparative reactivity method (ICRM): measurements of OH reactivity under high-NO<sub><i>x</i></sub> conditions in ambient air." Atmospheric Measurement Techniques 14, no. 3 (2021): 2285–98. http://dx.doi.org/10.5194/amt-14-2285-2021.

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Abstract. The comparative reactivity method (CRM) was developed more than a decade to measure OH reactivity (i.e., OH loss frequency) in both laboratory and field studies. However, accurate OH reactivity quantification remains challenging under real ambient conditions, especially for OH reactivity measurements in high-NOx (e.g., > 10 ppbv) environments, as ambient NO enhances the regeneration of OH radicals in the CRM reactor. To solve this problem, we design a new and improved CRM reactor (ICRM) and add NO into the system continuously so that the HO2 radical concentration is suppressed. We

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Cassin, Savannah R., Sean Flynn, Pierre Chambon, and Steve P. Rannard. "Quantification of branching within high molecular weight polymers with polyester backbones formed by transfer-dominated branching radical telomerisation (TBRT)." RSC Advances 11, no. 39 (2021): 24374–80. http://dx.doi.org/10.1039/d1ra03886a.

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The characterisation and quantification of branching is key to understanding new complex macromolecules. Here we establish approaches to evaluate the unique and novel architectures formed by Transfer-dominated Branching Radical Telomerisation (TBRT).

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27

Krewenka, Christopher, Sandra Rizzi, Chi Huu Nguyen, et al. "Radical Scavenging Is Not Involved in Thymoquinone-Induced Cell Protection in Neural Oxidative Stress Models." Antioxidants 12, no. 4 (2023): 858. http://dx.doi.org/10.3390/antiox12040858.

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Thymoquinone (TQ), an active compound from Nigella sativa seeds, is often described as a pharmacologically relevant compound with antioxidative properties, while the synthesis of TQ in the plant via oxidations makes it inapplicable for scavenging radicals. Therefore, the present study was designed to reassess the radical scavenging properties of TQ and explore a potential mode of action. The effects of TQ were studied in models with mitochondrial impairment and oxidative stress induced by rotenone in N18TG2 neuroblastoma cells and rotenone/MPP+ in primary mesencephalic cells. Tyrosine hydroxyl

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Xie, Jiangzhou, Changyong Zhang, and T. David Waite. "Hydroxyl radicals in anodic oxidation systems: generation, identification and quantification." Water Research 217 (June 2022): 118425. http://dx.doi.org/10.1016/j.watres.2022.118425.

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29

Campbell, Steven J., Svetlana Stevanovic, Branka Miljevic, Steven E. Bottle, Zoran Ristovski, and Markus Kalberer. "Quantification of Particle-Bound Organic Radicals in Secondary Organic Aerosol." Environmental Science & Technology 53, no. 12 (2019): 6729–37. http://dx.doi.org/10.1021/acs.est.9b00825.

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Gál, Dezső, András Németh, and Tamás Kriska. "Quantification of the formation of free radicals in macrophage systems." Reaction Kinetics and Catalysis Letters 68, no. 1 (1999): 105–13. http://dx.doi.org/10.1007/bf02475492.

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31

Siddhartha, Pragyadeep Shikhar Verma Sharad Srivastava* AKS Rawat. "QUANTIFICATION OF ANTIOXIDANT POLYPHENOLS FROM BOENNINGHAUSENIA ALBIFLORA." INDO AMERICAN JOURNAL OF PHARMACEUTICAL RESEARCH 07, no. 01 (2017): 7532–40. https://doi.org/10.5281/zenodo.1007287.

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The aim of this study was to screen various extracts prepared from aerial part and root of Boenninghausenia albiflora for their metabolite profiling and in-vitro antioxidant activity. Arial part and root were subjected to quantitative screening test for various constituents which revealed the presence of sugar (6.5 and 8.4%), starch (7.0 and 10%), and tannins (37.5 and 36.96 μg tannic acid equivalent /mg dry extract), respectively. The order of total phenolic content was descended in following order: hydro-alcoholic extract of aerial part (HEA) methanolic extract of aerial part (MEA) hydro-a

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RHEMREV, JOHANN P. T., FLORIS W. P. C. VAN OVERVELD, GUIDO R. M. M. HAENEN, TOM TEERLINK, AALT BAST, and JAN P. W. VERMEIDEN. "Quantification of the Nonenzymatic Fast and Slow TRAP in a Postaddition Assay in Human Seminal Plasma and the Antioxidant Contributions of Various Seminal Compounds." Journal of Andrology 21, no. 6 (2000): 913–20. http://dx.doi.org/10.1002/j.1939-4640.2000.tb03422.x.

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ABSTRACT: Total radical‐trapping antioxidant potential (TRAP) measurements of human seminal plasma (N = 25) were performed by using a post‐addition assay based on trapping 2,2′ Azino‐bis(3‐ethylbenzthiazoline‐6‐sulfonic acid) (ABTS) radicals. This method enables the antioxidant capacity of human seminal plasma and its constituents to be quantified. The standard procedure consisted of determination of the Trolox equivalent antioxidant capacity (TEAC) after incubating the test sample in the ABTS radical solution for 10 seconds (fast TRAP) and 300 s (total TRAP). Interestingly, seminal plasma sho

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Regoli, Francesco, and Gary W. Winston. "Quantification of Total Oxidant Scavenging Capacity of Antioxidants for Peroxynitrite, Peroxyl Radicals, and Hydroxyl Radicals." Toxicology and Applied Pharmacology 156, no. 2 (1999): 96–105. http://dx.doi.org/10.1006/taap.1999.8637.

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Lee, Chang-Dae, Jajung Ku, Sullim Lee, and Sanghyun Lee. "Quantification of Phytochemicals in Cephalotaxus harringtonia: Insights into Plant Tissue-Specific Allocation." Horticulturae 10, no. 12 (2024): 1286. https://doi.org/10.3390/horticulturae10121286.

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Cephalotaxus harringtonia has garnered recent attention for its promising medicinal properties attributed to its alkaloid composition, including harringtonine and homoharringtonine known for their radical scavenging activities. High-performance liquid chromatography was used to assess the distribution of harringtonine, homoharringtonine, and ginkgetin in different plant parts of C. harringtonia. Additionally, DPPH and ABTS+ assays were conducted to evaluate the radical scavenging activity of C. harringtonia extracts. These results revealed that bud extracts from C. harringtonia exhibited the h

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Mladenova, Ralitsa, Nikolay Solakov, Kamelia Loginovska, and Yordanka Karakirova. "Analysis of Gamma-Irradiation Effect on Radicals Formation and on Antiradical Capacity of Horse Chestnut (Aesculus hippocastanum L.) Seeds." Applied Sciences 15, no. 6 (2025): 3287. https://doi.org/10.3390/app15063287.

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The irradiation by gamma-rays is a widely used technique for disinfection in the pharmaceutical and cosmetic industries. In view of growing concerns by consumers about this technique, further investigation of the effects of radiation is required. In this work electron paramagnetic resonance (EPR) spectroscopy was applied to study the free radicals in irradiated horse chestnut (Aesculus hippocastanum L.) seeds and to evaluate the free radical scavenging activity (FRSA) using the stable DPPH radical. In order to evaluate the antiradical potential, a spectrophotometric study was also used. The id

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Zaytsev, Alexander, Martin Breitenlechner, Anna Novelli, et al. "Application of chemical derivatization techniques combined with chemical ionization mass spectrometry to detect stabilized Criegee intermediates and peroxy radicals in the gas phase." Atmospheric Measurement Techniques 14, no. 3 (2021): 2501–13. http://dx.doi.org/10.5194/amt-14-2501-2021.

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Abstract. Short-lived highly reactive atmospheric species, such as organic peroxy radicals (RO2) and stabilized Criegee intermediates (SCIs), play an important role in controlling the oxidative removal and transformation of many natural and anthropogenic trace gases in the atmosphere. Direct speciated measurements of these components are extremely helpful for understanding their atmospheric fate and impact. We describe the development of an online method for measurements of SCIs and RO2 in laboratory experiments using chemical derivatization and spin trapping techniques combined with H3O+ and

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DYKENS, JAMES A., J. MALCOLM SHICK, CRAIG BENOIT, GARRY R. BUETTNER, and GARY W. WINSTON. "Oxygen Radical Production in the Sea Anemone Anthopleura Elegantissima and its Endosymbiotic Algae." Journal of Experimental Biology 168, no. 1 (1992): 219–41. http://dx.doi.org/10.1242/jeb.168.1.219.

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Host animals in algal-invertebrate endosymbiotic associations are exposed to photosynthetically generated hyperoxia while in sunlight, conditions conducive to photodynamic excitations and production of cytotoxic oxygen-derived radicals such as the superoxide anion (O2−) and the hydroxyl radical (OH). All previous vidence of oxyradical production in symbiotic associations has been circumstantial. We here present direct evidence, from electron paramagnetic resonance studies on tissue homogenates of the photosymbiont-containing sea anemone Anthopleura elegantissima (Brandt), of substantial light-

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Zhang, Zifang, Junhua Bai, Yan Gong, and Lifang Zhang. "Visual Detection of Ascorbic Acid via Smartphone with Portable Probe Based on Assembled FePO4@GO Peroxidase-like Nanozyme." Molecules 29, no. 21 (2024): 5097. http://dx.doi.org/10.3390/molecules29215097.

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Ascorbic acid (AA) plays an important role in many physiological and biochemical processes. Adequate quantification of AA is required for controlling the intake of AA for health management. In this study, a portable probe was fabricated based on the assembled FePO4@GO nanozyme by homogeneous precipitation. FePO4@GO exhibits excellent peroxidase (POD) activity. As an efficient free radical scavenger, ascorbic acid scavenges 1O2 free radicals produced by hydrogen peroxide catalyzed by peroxidase enzymes and then inhibits the color reaction of 3,3′,5,5′-tetramethylbenzidine (TMB). A good linear r

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A. Ayob, Shemaa. "Walnut Oil Extract and Its Ability to Scavenge Free Radicals, Phenolic Content and Effective Antioxidants." Tikrit Journal of Pure Science 30, no. 1 (2025): 31–39. https://doi.org/10.25130/tjps.v30i1.1804.

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Walnuts have been the oldest food for living things. It contains biologically active antioxidants, vitamin E, omega-3 fatty acids, moreover minerals such as sodium, calcium, iron, copper, magnesium and manganese, protein and fiber, etc making it a comprehensive healthy meal. This phenols in green walnut fruits have extracted in our study using methanol. Protocatechuic acid, sinapic acid, gallic acid, chlorogenic acid, and catechin have found among the individual and total phenols. Single-phenolic compound quantification is carried out using a SYKAMN chromatography system and reverse phase HPLC

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Gielis, Jan F., Gaëlle A. Boulet, Jacob J. Briedé, et al. "Longitudinal quantification of radical bursts during pulmonary ischaemia and reperfusion." European Journal of Cardio-Thoracic Surgery 48, no. 4 (2015): 622–29. http://dx.doi.org/10.1093/ejcts/ezu518.

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Tannous, Joy H., and Arno de Klerk. "Quantification of the Free Radical Content of Oilsands Bitumen Fractions." Energy & Fuels 33, no. 8 (2019): 7083–93. http://dx.doi.org/10.1021/acs.energyfuels.9b01115.

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Zhang, Xianhui, Renwu Zhou, Kateryna Bazaka, et al. "Quantification of plasma produced OH radical density for water sterilization." Plasma Processes and Polymers 15, no. 6 (2018): 1700241. http://dx.doi.org/10.1002/ppap.201700241.

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Arangio, Andrea M., Haijie Tong, Joanna Socorro, Ulrich Pöschl, and Manabu Shiraiwa. "Quantification of environmentally persistent free radicals and reactive oxygen species in atmospheric aerosol particles." Atmospheric Chemistry and Physics 16, no. 20 (2016): 13105–19. http://dx.doi.org/10.5194/acp-16-13105-2016.

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Abstract. Fine particulate matter plays a central role in the adverse health effects of air pollution. Inhalation and deposition of aerosol particles in the respiratory tract can lead to the release of reactive oxygen species (ROS), which may cause oxidative stress. In this study, we have detected and quantified a wide range of particle-associated radicals using electron paramagnetic resonance (EPR) spectroscopy. Ambient particle samples were collected using a cascade impactor at a semi-urban site in central Europe, Mainz, Germany, in May–June 2015. Concentrations of environmentally persistent

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Borges, J. C., M. R. Silva, A. C. Tedesco, D. S. Costa, C. R. Esper, and P. H. Franceschini. "12 QUANTIFICATION OF REACTIVE OXYGEN SPECIES IN BOVINE SEMEN WITH DIFFERENT SEMINAL QUALITY AND WITH EXTENDER CONTAINING ANTIOXIDANT EVALUATED BY ARTIFICIAL INSEMINATION." Reproduction, Fertility and Development 22, no. 1 (2010): 164. http://dx.doi.org/10.1071/rdv22n1ab12.

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The aim this study was to evaluate the effects on artificial insemination (AI) of minimizing oxidative stress by adding an antioxidant into the sperm microenvironment. For that purpose, semen of bulls with different seminal quality was evaluated in nature and after addition of extender with and without antioxidant, followed by freezing and thawing, with respect to thiobarbituric acid reactive substances (TBARS) concentration, total antioxidant capacity (TAC), and AI success. TBARS is an indicator of lipid peroxidation and TAC measures free radicals. Twelve ejaculates from 5 bulls were treated

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Wang, Yun, Xuefei Lv, Yu Li, Guang Peng, Javed Iqbal, and Yulin Deng. "Preparation of trypsin aptamer modified silica particles by surface initiated atom transfer radical polymerization for proteome identification." Analytical Methods 8, no. 21 (2016): 4277–84. http://dx.doi.org/10.1039/c5ay02080h.

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Craciun, Veronica Isabela, Felicia Gabriela Gligor, Anca Maria Juncan, Luca Liviu Rus, and Claudiu Morgovan. "Ubidecarenone Quantification in Food Supplements A new HPLC method." Revista de Chimie 70, no. 10 (2019): 3575–78. http://dx.doi.org/10.37358/rc.19.10.7599.

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Coenzyme Q10 has a powerful antioxidant effect because it protects cells against free radicals and plays an important role in metabolism. Although controversial some preliminary evidence suggests that Coenzyme Q10 can help prevent or treat treatment of diseases of the cardiovascular and musculoskeletal systems and liver problems. Age increase and medical conditions are associated with lower Coenzyme Q10. There are evidences that diet supplementation with supplements containing Coenzyme Q10 may be beneficial. This paper aims to develop an HPLC method for identifying and dosing Ubidecarenone in

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Allabaksh, Shaik, and R. Senthilraj. "A QUANTITATIVE HPLC ANALYSIS OF PHYTOCONSTITUENTS AND ASSESSMENT OF ANTIOXIDANT PROPERTIES OF THE RHIZOME OF Curcuma angustifolia ROXB." Rasayan J. Chem 17, no. 02 (2024): 588–97. http://dx.doi.org/10.31788/rjc.2024.1728798.

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The study undertaken aimed to rigorously standardize the primary phytochemical categories within the rhizome of Curcuma angustifolia, commonly referred to as Indian Arrowroot, by employing reverse-phase High-Performance Liquid Chromatography (HPLC). This research also ventured into assessing the antioxidant potential of rhizomederived extracts from Curcuma angustifolia. In this context, the ethanol extract of the Curcuma angustifolia Roxb. rhizome was meticulously analyzed for its content of vital phytochemicals such as flavonoids (0.013±0.78mg/ml), alkaloids (0.11±0.45mg/ml), and phenolics (4

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Agatonovic-Kustrin, Snezana, and David W. Morton. "Quantification of polyphenolic antioxidants and free radical scavengers in marine algae." Journal of Applied Phycology 30, no. 1 (2017): 113–20. http://dx.doi.org/10.1007/s10811-017-1139-x.

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Kozuleva, Marina, Irina Klenina, Ivan Mysin, et al. "Quantification of superoxide radical production in thylakoid membrane using cyclic hydroxylamines." Free Radical Biology and Medicine 89 (December 2015): 1014–23. http://dx.doi.org/10.1016/j.freeradbiomed.2015.08.016.

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La, Ju A., and Eun Chul Cho. "Manipulation of Silver Nanocubes Detection Sensitivity to Radical Compounds by Modifying Their Surfaces with Anionic/Cationic Polyelectrolytes for Wide-Range Quantification of Radicals." Analytical Chemistry 86, no. 13 (2014): 6675–82. http://dx.doi.org/10.1021/ac501430t.

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