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1

Sangkanu, Suthinee, Wanlapa Nuankaew, Thanet Pitakbut, and Sukanya Dej-adisai. "Phytochemical Investigation and Biological Activities of Desmodium heterocarpon Extract as Anti-Tyrosinase: Isolation of Natural Compounds, In Vitro and In Silico Study." Life 14, no. 11 (2024): 1400. http://dx.doi.org/10.3390/life14111400.

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Tyrosinase is an important enzyme in the biosynthesis of melanin. Many skin-whitening agents that inhibit tyrosinase activity from natural sources have been identified because they are harmless and non-toxic. In this work, 114 samples of 54 Fabaceae plants were assessed for their anti-tyrosinase activity using a dopachrome method. The results found that Desmodium heterocarpon stems and roots demonstrated the highest tyrosinase inhibitory activity at 20 µg/mL (92.50 ± 1.09%), whereas the water extract of Artocarpus lacucha and kojic acid demonstrated 87.41 ± 0.61% and 95.71 ± 0.33%, respectivel
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2

Vikas, V. Vaidya Manjiri A.Shinde* Pushkar M. Pradhan. "SEPARATION AND QUANTIFICATION OF PHARMACOLOGICALLY ACTIVE MARKERS p-METHOXY BENZOIC ACID, 3, 4-DIHYDROXYBENZOIC ACID AND GALLIC ACID FROM CAPPARIS SPINOSA AND FROM MARKETED FORMULATION BY HPTLC." INDO AMERICAN JOURNAL OF PHARMACEUTICAL SCIENCES 05, no. 02 (2018): 1226–32. https://doi.org/10.5281/zenodo.1190298.

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A simple, accurate, precise and reproducible High Performance Thin Layer Chromatographic (HPTLC) method for simultaneous quantification of p-methoxybenzoic acid, 3, 4-dihydroxybenzoic acid and Gallic acid in the leaf extract of Capparis spinosa was developed. Chromatography was performed on silica gel 60 F254 pre-coated HPTLC plates with double development using two solvent systems. Using first solvent system, Chloroform: Ethyl acetate: Formic acid: Glacial acetic acid 7.5 : 2 : 0.5 : 0.5 (v/v/v/v) the plate was developed till 80 mm while the second development was carried out till 85 mm using
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3

Ayer, William A., Lois M. Browne, Meow-Chen Feng, Helena Orszanska, and Hussein Saeedi-Ghomi. "The chemistry of the blue stain fungi. Part 1. Some metabolites of Ceratocystis species associated with mountain pine beetle infected lodgepole pine." Canadian Journal of Chemistry 64, no. 5 (1986): 904–9. http://dx.doi.org/10.1139/v86-149.

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Metabolites formed in still culture by Ceratocystisclavigera, C. ips, and C. huntii, three of the four Ceratocystis species associated with the blue stain disease of pine, have been identified. In addition to the ubiquitous fungal metabolites ergosterol, ergosterol peroxide, and fatty acids we have isolated succinic acid, β-phenethyl alcohol (1), tryptophol (2), prolylleucyl anhydride (3), tyrosol (4), 3-phenylpropane-1,2-diol (5), 6,8-dihydroxy-3-methylisocoumarin (8), 6,8-dihydroxy-3-hydroxymethylisocoumarin (9), p-hydroxybenzaldehyde (10), phenylacetic acid (11), p-hydroxyphenylacetic acid
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4

Kumarathasan, Prem, Renaud Vincent, Patrick Goegan, Marc Potvin, and Josée Guénette. "Hydroxyl radical adduct of 5-aminosalicylic acid: A potential marker of ozone-induced oxidative stress." Biochemistry and Cell Biology 79, no. 1 (2001): 33–42. http://dx.doi.org/10.1139/o00-091.

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The use of 5-aminosalicylic acid in assessment of reactive oxygen species formation was investigated by in vitro Fenton and ozonation reactions, and by in vivo ozone-exposure experiments. Enzymatic hydroxylation was evaluated by a microsomal assay. Fischer 344 male rats (250 g) injected with 5-aminosalicylic acid (100 mg·kg-1 i.p.; 30 min) were exposed to ozone (0, 1, 2 ppm; nose only, 2 h); bronchoalveolar lavage, lung homogenates, and plasma were recovered. Oxidation products of 5-aminosalicylic acid were as follows: salicylic acid, by deamination; 2,3-dihydroxybenzoic acid and 2,5-dihydroxy
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5

Dandela, Rambabu, Srinu Tothadi, Udaya Kiran Marelli, and Ashwini Nangia. "Systematic synthesis of a 6-component organic-salt alloy of naftopidil, and pentanary, quaternary and ternary multicomponent crystals." IUCrJ 5, no. 6 (2018): 816–22. http://dx.doi.org/10.1107/s2052252518014057.

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The single-crystal X-ray structure of a 6-component organic-salt alloy (hexanary) of naftopidil (1) (an active pharmaceutical ingredient) with benzoic acid (2) and four different hydroxy-substituted benzoic acids, i.e. salicylic acid (3), 2,3-dihydroxybenzoic acid (4), 2,4-dihydroxybenzoic acid (5) and 2,6-dihydroxybenzoic acid (6), is reported. The hexanary assembly originates from the observation that the binary salts of naftopidil with the above acids are isostructural. In addition to the 6-component solid, we also describe five 5-component, ten 4-component, and ten 3-component organic-salt
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6

Akita, Masaharu, Atsushi Yokoyama, and Hitoshi Kontani. "Teratogenicity of salicylate and its metabolites (2, 4-Dihydroxybenzoic acid and 2, 5-Dihydroxybenzoic acid) studied in the rat embryo culture method." Japanese Journal of Pharmacology 79 (1999): 295. http://dx.doi.org/10.1016/s0021-5198(19)35195-9.

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7

Yang, Ai Mei, Yun Men, Han Han, et al. "Chemical Constituents from Gentiana algida Pall." Advanced Materials Research 881-883 (January 2014): 419–22. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.419.

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Eight compounds were isolated from the ethanol extract of G. algida Pall. the structure of these compounds were identified as: oleic acid (1), linoleic acid (2), octacosanoic acid (3), β-sitosterol (4), 2,3-dihydroxybenzoic acid ethyl ester (5), n-butyl isobutyl phthalate (6), daucosterol (7), 5,8-dimethoxy furocoumarin (8). These structures were identified by NMR MS IR and other spectroscopic techniques. These compounds were isolated from this plant for the first time.
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8

M., Jude Jenita, Antony Muthu Prabhu A. та Rajendiran N. "Encapsulation of 3,5-dihydroxybenzoic acid and 3,4,5-trihydroxybenzoic acid by α- and β -cyclodextrins : Spectral and theoretical studies". Journal of Indian Chemical Society Vol. 91, Sep 2014 (2014): 1711–30. https://doi.org/10.5281/zenodo.5733117.

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Department of Chemistry, Annamalai University, Annamalainagar-608 002, Tamilnadu, India <em>E-mail</em> : drrajendiran@rediffmail.com <em>Manuscript received online 22 February 2014, accepted 06 April 2014</em> Inclusion complex formation of &alpha;-CD, &beta;-CD, hydroxy propyl-&alpha;-CD (Hp-&alpha;-CD) and hydroxy propyl-&beta;-CD (Hp-&beta;-CD) of 3,5-dihydroxybenzoic acid (DHBA) and 3,4,5-trihydroxybenzoic acid (THBA) were investigated. The inclusion complexes of both guest molecules with the four CDs were analysed by UV-Visible, steady state and time resolved fluorescence, FTIR, <sup>1</
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9

Smith, C. J., J. A. E. Gibson, and W. J. Bond. "Evaluating the potential of inorganic and organic ligands to extract aluminium from an acidic soil using batch and leaching cells." Soil Research 35, no. 3 (1997): 539. http://dx.doi.org/10.1071/s96024.

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Batch and leaching cell approaches were used to study the effect of a range of inorganic and organic ligands on the distribution of aluminium (Al) between the exchangeable and solution phase and to assess the ability of the ligands to mobilise aluminium in an acidic red earth (Calcic Rhodoxeralf). Anions were chosen to represent a range of potential abilities to form complexes with Al. They included chloride, fluoride, citrate, salicylate, 2,3-dihydroxybenzoic acid, catechol, and 2 different coal-derived fulvates. Batch experiments, using a 1 : 5 soil : solution ratio, showed that citrate, 2,3
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10

Anwar, Muhammad Aijaz, Nighat Afzaa, Sadia Ferheen, et al. "Nematicidal Potential of the Galinsoga parviflora." Biological Sciences - PJSIR 54, no. 2 (2011): 83–87. http://dx.doi.org/10.52763/pjsir.biol.sci.54.2.2011.83.87.

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Seven pure compounds of the Galinsoga parviflora: �-sitosterol (1); octacosanoic acid (2); ursolic acid (3); 4-hydroxybenzoic acid (4); 3,4-dihydroxybenzoic acid (5); gallic acid (6); �-sitosterol' 3-0-, �-D glucopyranoside (7) and the plant crude extract fractions were assayed in the laboratory for their nematicidal properties against plant parasitic nematodes Meloidogyne incognita (root-knot) and Cephalobus litoralis in different concentrations after 24 and 48 h. It was observed that crude extract, hexane, chloroform, ethyl acetate, methanol fractions and compounds no 1, 3, 4, and 7 showed s
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11

Faroque, Muhammad Umer, Sajida Noureen, Maqsood Ahmed, and Muhammad Nawaz Tahir. "Electrostatic properties of the pyrimethamine–2,4-dihydroxybenzoic acid cocrystal in methanol studied using transferred electron-density parameters." Acta Crystallographica Section C Structural Chemistry 74, no. 1 (2018): 100–107. http://dx.doi.org/10.1107/s2053229617017788.

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The crystal structure of the cocrystal salt form of the antimalarial drug pyrimethamine with 2,4-dihydroxybenzoic acid in methanol [systematic name: 2,4-diamino-5-(4-chlorophenyl)-6-ethylpyrimidin-1-ium 2,4-dihydroxybenzoate methanol monosolvate, C12H14ClN4 +·C7H5O4 −·CH3OH] has been studied using X-ray diffraction data collected at room temperature. The crystal structure was refined using the classical Independent Atom Model (IAM) and the Multipolar Atom Model by transferring electron-density parameters from the ELMAM2 database. The Cl atom was refined anharmonically. The results of both refi
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12

Santiago de Oliveira, Yara, Wendell Saraiva Costa, Poliana Ferreira Borges, Maria Silmara Alves de Santana, and Alejandro Pedro Ayala. "The design of novel metronidazole benzoate structures: exploring stoichiometric diversity." Acta Crystallographica Section C Structural Chemistry 75, no. 5 (2019): 483–95. http://dx.doi.org/10.1107/s2053229619003838.

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The use of supramolecular synthons as a strategy to control crystalline structure is a crucial factor in developing new solid forms with physicochemical properties optimized by design. However, to achieve this objective, it is necessary to understand the intermolecular interactions in the context of crystal packing. The feasibility of a given synthon depends on its flexibility to combine the drug with a variety of coformers. In the present work, the imidazole–hydroxy synthon is investigated using as the target molecule benzoylmetronidazole [BZMD; systematic name 2-(2-methyl-5-nitro-1H-imidazol
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13

Arevalo, Carolina, Cinzia Lotti, Anna Lisa Piccinelli, Mariateresa Russo, Ines Ruiz, and Luca Rastrelli. "Magnoflorine and Phenolic Derivatives from the Leaves of Croton xalapensis L. (Euphorbiaceae)." Natural Product Communications 4, no. 12 (2009): 1934578X0900401. http://dx.doi.org/10.1177/1934578x0900401218.

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The alkaloid magnoflorine 1, has been isolated for the first time from Croton xalapensis (Euphorbiaceae), in addition two phenylpropenols derivates, 3,4-dimethoxy-(E)-cinnamyl alcohol 2 and 3,4-dimethoxy-5-hydroxy-(E)-cinnamyl alcohol 3, 3,4,5-trimethoxycinnamic acid 4, gallic acid 5, methyl gallate 6 and 3,4-dihydroxybenzoic acid 7 have been also found; these compounds were identified by spectroscopic analysis particularly, 2D NMR and ESI-MS/MS techniques. The high concentration of magnoflorine, calculated with quantitative HPLC, of the aqueous extract, probably contributes to the remarkable
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14

Kricheldorf, Hans R., Olaf Stöber, and Dierk Lübbers. "New polymer syntheses, 81 . Poly(3-oxybenzoate) randomly branched with 3,5-dihydroxybenzoic acid or 5-hydroxyisophthalic acid." Macromolecular Chemistry and Physics 196, no. 11 (1995): 3549–62. http://dx.doi.org/10.1002/macp.1995.021961109.

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15

Luo, Yong Ming, Zhong Li Zhang, and Yue Ming Zuo. "Studies on Chemical Constituents from the Aerial Parts of Saururus chinensis." Advanced Materials Research 393-395 (November 2011): 1427–30. http://dx.doi.org/10.4028/www.scientific.net/amr.393-395.1427.

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To investigate into the active chemical constituents of Sanrurus chinensis. Repeated silica gel column chromatography was used in the isolation and purification; determination and spectral analysis were adopted to identify the chemical structures. Nineteen chemical compounds were isolated from the aerial parts of Saururus chinensis and identified as sauchinone (1),sauchinone A (2), licarin B (3),saucernetin(4), Saucerneol I(5), Kaemferol(6), Kaemferol- 3-O-rhamnopyranosyl(1→6)glucopyranoside(7), luteolin(8), quecretin (9), quecretin-7-O-β- D-glueopyranoside (10), quecretin-7-O -α-D-glueopyranos
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16

Diatta, Armel, Anastasie Manga, Abdoulaye Gassama, and Catherine Lavaud. "Activité Anti-Hyperglycémiante Et Élucidation Structurale Des Composés Isolés Des Feuilles De Spondias Purpurea L. (Anacardiaceae)." European Scientific Journal, ESJ 13, no. 36 (2017): 312. http://dx.doi.org/10.19044/esj.2017.v13n36p312.

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Spondias purpurea L. (Anacardiaceae) is a Senegalese traditional pharmacopoeia plant, which leaves are used in the treatment of various diseases. The leaves’ ethanolic extract exhibited antihyperglycemic activity on models of temporary hyperglycemia. The tests were performed on normoglycemic rats with a glucose tolerance test. The phytochemical investigation of the leaves resulted in the isolation of four flavonoids (quercetin 9, kaempferol 10, quercetin-3- ß-glucopyranoside 6, kaempferol3-ß-galactopyranoside 8), five phenolic compounds (2,4-dihydroxybenzoic acid 2, 4-hydroxybenzoic acid 5, pr
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17

Luo, Yong Ming, Hua Liu, and Xiao Ying Yin. "Chemical Constituents and Bioactivity of Chloranthus fortunei." Advanced Materials Research 746 (August 2013): 28–30. http://dx.doi.org/10.4028/www.scientific.net/amr.746.28.

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From Chloranthus fortunei, A new sesquiterpene lactones, fortuniolide A (1) were isolated, together with five known compounds, shizukaol B (2), and C (3) lasianthuslactone A(4), β-sitosterol (5) and 3,4-dihydroxybenzoic acid (6). The structures of the isolated compounds were established by means of NMR and MS analyses. These compounds were firstly isolated from this plant. Compound 1 is new natural products and have inhibitory activities on the release of β-glucuronidase from rat PMNs induced by PAF.
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18

Kontoghiorghes, George J. "New Insights into Aspirin’s Anticancer Activity: The Predominant Role of Its Iron-Chelating Antioxidant Metabolites." Antioxidants 14, no. 1 (2024): 29. https://doi.org/10.3390/antiox14010029.

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Epidemiological studies have suggested that following long-term, low-dose daily aspirin (LTLDA) administration for more than 5 years at 75–100 mg/day, 20–30% of patients (50–80 years old) had a lower risk of developing colorectal cancer (CRC) and about the same proportion in developing iron deficiency anemia (IDA). In cases of IDA, an increase in iron excretion is suspected, which is caused by aspirin chelating metabolites (ACMs): salicylic acid, salicyluric acid, 2,5-dihydroxybenzoic acid, and 2,3-dihydroxybenzoic acid. The ACMs constitute 70% of the administered aspirin dose and have much lo
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19

Nofrizal, Deddi P. Putra, and Dayar Arbain. "Antioxidant and Antibacterial Constituents from Two Sumatran Ferns, Trichomanes javanicum and Oleandra pistillaris." Natural Product Communications 12, no. 8 (2017): 1934578X1701200. http://dx.doi.org/10.1177/1934578x1701200829.

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Mangiferin (1), vitexin (2) and 4- O-β-D-glucopyranosylcaffeic acid (3), by means of classical extraction, fractionation and chromatographic separation, have been isolated for the first time from aerial parts (stems and leaves) of Trichomanes javanicum Blume (Hymenophyllaceae) as well as 3,4-dihydroxybenzoic acid (4) and gallic acid (5) from the rhizome of Oleandra pistillaris (Sw.) C. Chr. (Oleandraceae). These compounds were characterized by spectroscopic methods and then compared to those of data reported in the literature. Compound (1) and (4) showed significant antioxidant activity (IC50
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20

Su, Zushang, Ping Wang, Wei Yuan, Greg Grant, and Shiyou Li. "Phenolics from the Fruits of Maclura pomifera." Natural Product Communications 12, no. 11 (2017): 1934578X1701201. http://dx.doi.org/10.1177/1934578x1701201122.

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Two new compounds, maclurin A (1) and maclurin B (2), and six known ones, ononin (3), pterofuran (4), osajin (5), pomiferin (6), 3,4-dihydroxybenzoic acid (7), and 2,3,4-trihydroxybenzoic acid (8) were isolated from the fruit of Maclura pomifera. Compounds 3 and 4 were isolated from the genus for the first time. Structure elucidation was achieved by spectroscopic measurements and by comparison with literature data. Compounds 2-4 exhibited activities against the cancer cell lines A549 and Panc-28 with GI50 values from 18.1 to 32.2, and 20.6 to 43.5 μM, respectively. Compounds 2 and 4 also showe
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21

Luo, Yong Ming, Yong Dong Luo, Fang You Chen, Hua Liu, and Jian Jiang Fu. "Studies on the Chemical Constituents of Chloranthus henryi." Advanced Materials Research 1033-1034 (October 2014): 279–82. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.279.

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FromChloranthushenryi,ten compounds were isolated and identified as 1β,8β-Dihydroxy-eudesman 4(15),7(11)-dien8α,12-olide (1), 4β,8β-dihydroxy-5α (H)- eudesm-7(11) -en-8,12-olide (2), 12-oxo-15-hydroxylabda-8(17), 13E-dien-19-oic acid (3), 12(S), 15-dihydroxy labda - 8(17),13E-dien-19-oic acid (4) , curcolonol (5), flavokawain A (6), 2 ́-hydroxy-4, 3 ́, 4 ́, 6 ́– tetramethoxychalcone (7), daucosterol (8), β-sitosterol (9) and 3,4-dihydroxybenzoic acid (10). The structures of the isolated compounds were established by means of NMR and MS analyses. These compounds were firstly isolated from this
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22

Pupkova, Yu, O. Sharutina та V. Sharutin. "Structual features of the dearylation reaction рroducts of pentarylantimony with polyfunctional acids". Bulletin of the South Ural State University series "Chemistry" 16, № 2 (2024): 46–57. http://dx.doi.org/10.14529/chem240204.

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It has been established that in reactions with pentaphenylantimony, 2,3-dihydroxybenzoic and 5-hydroxypyridine-2-carboxylic acids behave as bifunctional compounds and form binuclear products [Ph4Sb]+[Ph4Sb(O,O¢-C6H3COOH-3]- (I), Ph4SbOC(O)C5H3NOSbPh4-4 (II), respectively. The reaction with 2,3-dihydroxybenzoic acid occurs with the participation of just hydroxy groups, while the interaction with 5-hydroxypyridine-2-carboxylic acid proceeds with the participation of hydroxy and carboxy groups. 2,6-Dihydroxybenzoic acid reacts with penta(para-tolyl)antimony only at the carboxyl group, giving tetr
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23

Faroque, Muhammad Umer, Sajida Noureen, Shafaat Hussain Mirza, Muhammad Nawaz Tahir, and Maqsood Ahmed. "Structure and electrostatic properties of the pyrimethamine–3,5-dihydroxybenzoic acid cocrystal in water solvent studied using transferred electron-density parameters." Acta Crystallographica Section C Structural Chemistry 75, no. 1 (2019): 46–53. http://dx.doi.org/10.1107/s2053229618017060.

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Pyrimethamine is an antimalarial drug. The cocrystal salt form of pyrimethamine with 3,5-dihydroxybenzoic acid in water solvent has been synthesized, namely 2,4-diamino-5-(4-chlorophenyl)-6-ethylpyrimidin-1-ium 3,5-dihydroxybenzoate hemihydrate, C12H14ClN4 +·C7H5O4 −·0.5H2O. X-ray diffraction data were collected at room temperature. Refinement of the crystal structure was carried out using the classical Independent Atom Model (IAM), while the electrostatic properties were studied by transferring electron-density parameters from an electron-density database. The Cl atom was refined anharmonical
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24

Wang, Feifei, Jie Tan, Ruixiang Jiang, et al. "DPPH Radical Scavenging Activity of New Phenolics from the Fermentation Broth of Mushroom Morehella importuna." Molecules 28, no. 12 (2023): 4760. http://dx.doi.org/10.3390/molecules28124760.

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In recent years, wild morel mushroom species have begun to be widely cultivated in China due to their high edible and medicinal values. To parse the medicinal ingredients, we employed the technique of liquid-submerged fermentation to investigate the secondary metabolites of Morehella importuna. Two new natural isobenzofuranone derivatives (1–2) and one new orsellinaldehyde derivative (3), together with seven known compounds, including one o-orsellinaldehyde (4), phenylacetic acid (5), benzoic acid (6), 4-hydroxy-phenylacetic acid (7), 3,5-dihydroxybenzoic acid (8), N,N′-pentane-1,5-diyldiaceta
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25

Kvasnička, František, Jana Čopíková, Rudolf Ševčík, Jana Krátká, Andrej Syntytsia, and Michal Voldřich. "Determination of phenolic acids by capillary zone electrophoresis and HPLC." Open Chemistry 6, no. 3 (2008): 410–18. http://dx.doi.org/10.2478/s11532-008-0032-5.

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AbstractSelected phenolic acids are determined by capillary zone electrophoresis and HPLC, each using UV detection. The optimised CZE background electrolyte contained 50 mM acetic acid, 95 mM 6-aminocaproic acid, 0.1% polyacrylamide, 1% polyvinylpyrrolidone, and 10% methanol. Twelve phenolic acids (gallic, p-hydroxybenzoic, 3,4-dihydroxybenzoic, vanillic, syringic, o-coumaric, p-coumaric, caffeic, sinapic, ferulic, salicylic and chlorogenic) were separated within 10 minutes. Chromatographic separation of these phenolic acids was carried out on an Eclipse XBD C8 column using a mobile phase grad
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26

Li, Na, Yuting Chen, Ruixin Chen, Mingjuan Zhang, Tingting Wu, and Kang Liu. "Synthesis and Structure Characterization of Three Pharmaceutical Compounds Based on Tinidazole." Crystals 13, no. 6 (2023): 947. http://dx.doi.org/10.3390/cryst13060947.

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Tinidazole (TNZ), a 5-nitroimidazole derivative, has received increasing attention due to its pharmacological activities in treatment for amebic and parasitic infections. In this paper, we synthesized three novel drug supramolecular compounds successfully based on TNZ. The three compounds discussed were formed by TNZ and 2,6-dihydroxybenzoic acid (2,6-DHBA), 4-methylsalicylic acid (4-MAC), and 5-chloro-2-hydroxybenzoic acid (5-C-2-HBA). The N-H···O and O-H···O hydrogen bonds and weak C-H···O hydrogen bonds are the primary intermolecular forces in the construction of the three compounds. Crysta
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27

Józefczuk, Jan, and Bogdan Marian Woźniewicz. "Diagnosis and Therapy of Microscopic Colitis with Presence of Foamy Macrophages in Children." ISRN Gastroenterology 2011 (July 6, 2011): 1–9. http://dx.doi.org/10.5402/2011/756292.

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We discuss the diagnosis of and efficacy 5-amino-2-hydroxybenzoic acid (5-ASA), Saccharomyces boulardii, or magnesium in therapy of microscopic colitis with presence of foamy macrophages. A basis for diagnosis and inclusion to the analysed group was presence of characteristic foamy macrophages in histopathological examination of hematoxylin and eosin-stained specimens collected from the large intestine, reviewed under ×200 or ×320 magnification. No statistically significant improvement was found following the use of 5-amino-2-dihydroxybenzoic acid in therapy of the disease. The use of Saccharo
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28

Nowak, Anna, Paula Ossowicz-Rupniewska, Rafał Rakoczy, et al. "Bacterial Cellulose Membrane Containing Epilobium angustifolium L. Extract as a Promising Material for the Topical Delivery of Antioxidants to the Skin." International Journal of Molecular Sciences 22, no. 12 (2021): 6269. http://dx.doi.org/10.3390/ijms22126269.

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Bacterial cellulose membranes (BCs) are becoming useful as a drug delivery system to the skin. However, there are very few reports on their application of plant substances to the skin. Komagataeibacter xylinus was used for the production of bacterial cellulose (BC). The BC containing 5% and 10% ethanolic extract of Epilobium angustifolium (FEE) (BC-5%FEE and BC-10%FEE, respectively) were prepared. Their mechanical, structural, and antioxidant properties, as well as phenolic acid content, were evaluated. The bioavailability of BC-FESs using mouse L929 fibroblasts as model cells was tested. More
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29

Nirmal Ram, Jeyaraman Selvaraj, Udhayasuriyan Sathya, Sundaramoorthy Gomathi, and David Bradford Cordes. "Structure determination and Hirshfeld surface analysis of new cocrystal and salt forms of 5-aminotetrazole with hydroxy- and nitro-substituted carboxylic acids." Acta Crystallographica Section C Structural Chemistry 78, no. 7 (2022): 414–23. http://dx.doi.org/10.1107/s2053229622006519.

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Two new crystalline solids, namely, 5-aminotetrazole–3,5-dihydroxybenzoic acid–water (1/4/6), CH3N5·4C7H6O4·6H2O (I), and 5-aminotetrazolium 3,5-dinitrosalicylate, CH4N5 +·C7H3N2O7 − (II), have been synthesized and characterized by single-crystal X-ray diffraction and Hirshfeld surface analysis. The crystal packing arrangements of I and II are governed by N—H...O and O—H...O hydrogen-bonding interactions. In cocrystal I, adjacent acid molecules are linked through O—H...O hydrogen bonds, forming a dimer with an R 2 2(8) motif. In salt II, the tetrazolium cation and acid anion are linked through
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30

Palumbo, G., G. Carlucci, P. Mazzeo, G. Frieri, M. T. Pimpo, and D. Fanini. "Simultaneous determination of 5-aminosalicylic acid, acetyl-5-aminosalicylic acid and 2,5-dihydroxybenzoic acid in endoscopie intestinal biopsy samples in humans by high-performance liquid chromatography with electrochemical detection." Journal of Pharmaceutical and Biomedical Analysis 14, no. 1-2 (1995): 175–80. http://dx.doi.org/10.1016/0731-7085(95)01608-2.

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31

Augšpole, Ingrīda, Anda Liniņa, Ingmārs Cinkmanis, and Sanita Vucāne. "Phenolic Compounds in Organic and Conventional Winter Wheat (Triticum aestivum L.) Wholemeal." Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences. 75, no. 6 (2021): 444–48. http://dx.doi.org/10.2478/prolas-2021-0066.

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Abstract Winter wheat wholemeal is an important component of the human diet and may be a significant source of antioxidants. The objective of this study was to determine individual phenolic compounds in five winter wheat varieties: ‘Fredis’, ‘Edvins’, ‘94-5-N’, ‘Skagen’, and ‘SW Magnific’ wholemeal, grown according to organic and conventional agricultural practices. Ten phenolic compounds (vanilin, rutin, catechin hydrate, quercetin, p-coumaric acid, ferulic acid, 3.4-dihydroxybenzoic acid, 2-hydroxycinnamic acid, trans (3)-hydroxycinnamic acid, and gallic acid) were detected using high-perfor
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Ahire, Jayesh J., and Leon M. T. Dicks. "2,3-Dihydroxybenzoic Acid-Containing Nanofiber Wound Dressings Inhibit Biofilm Formation by Pseudomonas aeruginosa." Antimicrobial Agents and Chemotherapy 58, no. 4 (2014): 2098–104. http://dx.doi.org/10.1128/aac.02397-13.

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ABSTRACTPseudomonas aeruginosaforms biofilms in wounds, which often leads to chronic infections that are difficult to treat with antibiotics. Free iron enhances biofilm formation, delays wound healing, and may even be responsible for persistent inflammation, increased connective tissue destruction, and lipid peroxidation. Exposure ofP. aeruginosaXen 5 to the iron chelator 2,3-dihydroxybenzoic acid (DHBA), electrospun into a nanofiber blend of poly(d,l-lactide) (PDLLA) and poly(ethylene oxide) (PEO), referred to as DF, for 8 h decreased biofilm formation by approximately 75%. This was shown by
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33

Sánchez, M. J., M. A. Rodríguez, and F. García Montelongo. "Ternary Complex Nickel(II)/3-(4′,5′-Dimethyl-2′-Thiazolylazo)-2,6-Dihydroxybenzoic Acid/Cyanide. Spectrophotometric Determination of Nickel." Analytical Letters 22, no. 9 (1989): 2075–82. http://dx.doi.org/10.1080/00032718908051237.

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34

Zechmann, Carsten, Tassilo Muskat, and Jürgen Grotemeyer. "Wavelength- and Time-Resolved Luminescence Spectroscopy for Investigation of the Matrix-Assisted Laser Desorption Process." European Journal of Mass Spectrometry 8, no. 4 (2002): 287–93. http://dx.doi.org/10.1255/ejms.490.

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This work deals with investigations of fluorescence phenomena during interaction of ultraviolet laser radiation with four substances (2,5-dihydroxybenzoic acid, 3-hydroxypicolinic acid, dithranol and ferulic acid) commonly used as matrices in matrix-assisted laser desorption/ionization (MALDI). Wavelength-resolved fluorescence measurements allowed classification of UV-MALDI matrices on the basis of their Stokes shift. Matrices showing a high Stokes shift dissipated high amounts of laser energy by means of intra- and intermolecular energy transfer processes, hence contributing less to the ioniz
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35

Almaas, Runar, Ola D. Saugstad, David Pleasure, and Terje Rootwelt. "Effect of Barbiturates on Hydroxyl Radicals, Lipid Peroxidation, and Hypoxic Cell Death in Human NT2-N Neurons." Anesthesiology 92, no. 3 (2000): 764–74. http://dx.doi.org/10.1097/00000542-200003000-00020.

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Background Barbiturates have been shown to be neuroprotective in several animal models, but the underlying mechanisms are unknown. In this study, the authors investigated the effect of barbiturates on free radical scavenging and attempted to correlate this with their neuroprotective effects in a model of hypoxic cell death in human NT2-N neurons. Methods Hydroxyl radicals were generated by ascorbic acid and iron and were measured by conversion of salicylate to 2,3-dihydroxybenzoic acid. The effect of barbiturates on lipid peroxidation measured as malondialdehyde and 4-hydroxynon-2-enal was als
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36

Adamiec, J., K. Cejpek, J. Rössner, and J. Velíšek. "Novel Strecker degradation products of tyrosine and dihydroxyphenylalanine." Czech Journal of Food Sciences 19, No. 1 (2013): 13–18. http://dx.doi.org/10.17221/6568-cjfs.

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Tyrosine was oxidised with either potassium peroxodisulphate or glyoxal. Volatile reaction products were isolated and analysed by GC/FID and GC/MS, derivatised with diazomethane and analysed by the same methods. Eight reaction products were identified. The major products were the expected Strecker aldehyde (4-hydroxyphenylacetaldehyde) and its lower homologue 4-hydroxybenzaldehyde. They were followed by 1-(4-hydroxyphenyl)-3-propionaldehyde, phenylacetaldehyde, benzaldehyde, phenol, 4-hydroxybenzoic, and benzoic acid. Analogously, the oxidation of 3,4-dihydroxyphenylalanine yielded the corresp
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Amin, A. S., I. S. Ahmed, and M. E. Moustafa. "SELECTIVE SPECTROPHOTOMETRIC DETERMINATION OF COBALT(II) IN SYNTHETIC MIXTURES AND PHARMACEUTICAL FORMULATES WITH 5-[o-CARBOXYPHENYLAZO]2,4-DIHYDROXYBENZOIC ACID." Analytical Letters 34, no. 5 (2001): 749–59. http://dx.doi.org/10.1081/al-100103217.

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38

Wang, Ling-Ling, Liang-Jin Xu, Meng-Jie Ma, Chun-Yue Huang, Tong Wu та Xiao Hu. "Phenolic Constituents from the Stems of Morus nigra and their α-Glucosidase Inhibitory Activities". Pharmaceutical Fronts 03, № 01 (2021): e8-e12. http://dx.doi.org/10.1055/s-0041-1730957.

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AbstractsA new sanggenon-type flavanone, nigragenon F (1), together with 11 known compounds, trans-resveratrol (2), (E)-4-isopentenyl-3,5,2′,4′-tetrahydroxystilbene (3), notabilisin E (4), notabilisin A (5), morusin (6), petalopurpurenol (7), 8-geranyl-5,7-dihydroxycoumarin (8), 2,4-dihydroxybenzaldehyde (9), 4-ethoxy-2,6-dihydroxybenzoic acid (10), 3-hydroxy-4-methoxybenzaldehyde (11), and 4-hydroxybenzaldehyde (12), were isolated from the stems of Morus nigra. Compound 10 was a new natural product, compounds 3, 4, 7, and 8 were reported from the Morus genus for the first time. All of the iso
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Wróblewska, Katarzyna B., Szymon Plewa, Paweł Dereziński, and Izabela Muszalska-Kolos. "Choline Salicylate Analysis: Chemical Stability and Degradation Product Identification." Molecules 25, no. 1 (2019): 51. http://dx.doi.org/10.3390/molecules25010051.

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Choline salicylate (CS) as a derivative of acetylsalicylic acid is commonly used in different drug forms. In medicine, it is applied topically to inflammation of the oral cavity mucosa and in laryngology. However, this substance in the form of an ionic liquid has not been investigated enough. There are no literature studies on stability tests constituting a stage of pre-formulation research. HPLC (Nucleosil C18, 4.6 × 150 mm, 5 μm; methanol-water-acetic acid 60:40:1, 230 nm or 270 nm) and UV (276 nm) methods for the determination of CS in 2% (g/mL) aqueous solutions were developed. Under stres
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40

Upare, Pravin P., Rachel E. Clarence, Hyungsub Shin, and Byung Gyu Park. "An Overview on Production of Lignocellulose-Derived Platform Chemicals Such as 5-Hydroxymethyl Furfural, Furfural, Protocatechuic Acid." Processes 11, no. 10 (2023): 2912. http://dx.doi.org/10.3390/pr11102912.

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Furan derivatives such as 5-hydroxymethyl furfural (HMF) and furfural (FA) and aromatic acids such as protocatechuic acid (PCA) represent the most essential classes of intermediates derived from lignocellulosic biomass. These bio-based compounds are potential feedstocks for producing bio-based chemicals and fuels. However, the derivatives of these bio-based compounds are useful in their antioxidative, antibacterial, and anti-aging activities. Protocatechuic acid (PCA, 2,3-dihydroxybenzoic acid), derived from lignin biomass, is also one of the essential bio-derived aromatic intermediates with a
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41

Kang, Sokbom, Aera Lee, Young Seung Park, et al. "Alteration in Lipid and Protein Profiles of Ovarian Cancer: Similarity to Breast Cancer." International Journal of Gynecologic Cancer 21, no. 9 (2011): 1566–72. http://dx.doi.org/10.1097/igc.0b013e318226c5f5.

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AbstractThis study was undertaken to evaluate protein and lipid profiles of ovarian cancer tissue samples. Twenty-three frozen ovarian cancer samples and 6 adjacent normal samples were analyzed using histology-directed, matrix-assisted laser desorption/ionization mass spectrometry. Sinapinic acid and 2, 5-dihydroxybenzoic acid/α-cyano-4-hydroxycinnamic acid were manually deposited on areas of each tissue section enriched in epithelial cells to identify protein and lipid profiles respectively, and mass spectra were acquired using a matrix-assisted laser desorption/ionization–time of flight inst
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42

Do, Thanh-Hung, Thuc-Huy Duong, Huy Truong Nguyen, et al. "Biological Activities of Lichen-Derived Monoaromatic Compounds." Molecules 27, no. 9 (2022): 2871. http://dx.doi.org/10.3390/molecules27092871.

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Lichen-derived monoaromatic compounds are bioactive compounds, associated with various pharmacological properties: antioxidant, antifungal, antiviral, cytotoxicity, and enzyme inhibition. However, little is known about data regarding alpha-glucosidase inhibition and antimicrobial activity. Very few compounds were reported to have these activities. In this paper, a series of monoaromatic compounds from a lichen source were isolated and structurally elucidated. They are 3,5-dihydroxybenzoic acid (1), 3,5-dihydroxybenzoate methyl (2), 3,5-dihydroxy-4-methylbenzoic acid (3), 3,5-dihydroxy-4-methox
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43

Yassin, Rabee M. A. "Using of Oxidative - Coupling Reaction in Spectrophotometric Determination of Metoclopramide Hydrochloride in Pharmaceutical Preparations." BASRA JOURNAL OF SCIENCE 40, no. 2 (2022): 465–85. http://dx.doi.org/10.29072/basjs.20220215.

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A simple, sensitive, and rapid spectrophotometric method has been developed for the determination of metoclopramide hydrochloride (METH). The method includes the oxidative coupling reaction of metoclopramide with 2,5-dihydroxybenzoic acid using potassium periodate as an oxidizing agent in an aqueous medium and at pH of 4.5 to give a water-soluble colored product. The highest absorbance occurs at a wavelength of 500 nm. The linear range of Beer's law was within the concentration range of 5-75 µg/ml of (METH) and the value of the molar absorptivity 2.196 x103 l.mol-1.cm-1 and Sandell's index val
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44

Le, Hoa Thi, Kyu H. Park, Woong Jung, Hyung Soon Park, and Tae Woo Kim. "Combination of Microwave-Assisted Girard Derivatization with Ionic Liquid Matrix for Sensitive MALDI-TOF MS Analysis of Human Serum N-Glycans." Journal of Analytical Methods in Chemistry 2018 (October 21, 2018): 1–7. http://dx.doi.org/10.1155/2018/7832987.

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We developed a new method for MALDI-TOF MS detection of N-glycans derived from human serum. The synergistic combination of microwave-assisted Girard T derivatization, solid-phase extraction desalting, and an ionic liquid matrix (2, 5-dihydroxybenzoic acid/aniline) (GT-SPE-DHB/An) allowed of more sensitive N-glycans detection than a conventional ionic liquid matrix in MALDI-TOF MS. The superior sensitivity of our method was confirmed by the number of assigned N-glycans in 900–2,000 m/z range. Using our GT-SPE-DHB/An method, we were successfully able to assign 31 glycans. However, with the estab
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45

Sekandi, Peter, Jane Namukobe, Jane Namukobe, et al. "Bioactive secondary metabolites from the leaves of Secamone africana (Olive.) Bullock." International Journal of Biological and Chemical Sciences 14, no. 5 (2020): 1820–30. http://dx.doi.org/10.4314/ijbcs.v14i5.25.

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Secamone africana leaves are used in the treatment of malaria and other ailments in Uganda. The aim of the study was to characterize the antiplasmodial compounds from the leaves of Secamone africana. The leaves were extracted sequentially using dichloromethane (DCM) and methanol (MeOH). The crude extracts and isolated compounds were evaluated for their antiplasmodial activity against the chloroquine sensitive Sierraleone I (D6) and chloroquine-resistant Indochina I (W2) strains of Plasmodium falciparum. Isolation and purification were done using chromatographic techniques including column chro
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Petrou, Athinoula L., Vladimiros Thoma, and Konstantinos Tampouris. "Kinetics and Mechanism of the Reaction between Chromium(III) and 2,3-Dihydroxybenzoic Acid in Weak Acidic Aqueous Solutions." Bioinorganic Chemistry and Applications 2010 (2010): 1–8. http://dx.doi.org/10.1155/2010/348692.

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The reaction between chromium(III) and 2,3-dihydroxybenzoic acid (2,3-DHBA) takes place in at least three stages, involving various intermediates. The ligand (2,3-DHBA)-to-chromium(III) ratio in the final product of the reaction is 1 : 1. The first stage is suggested to be the reaction of[Cr(H2O)5(OH)]2+with the ligand in weak acidic aqueous solutions that follows anIdmechanism. The second and third stages do not depend on the concentrations of chromium(III), and their activation parameters areΔH≠=61.2±3.1 kJmol−1,ΔS≠=−91.1±11.0 JK−1mol−1,ΔH≠=124.5±8.7 kJmol−1, andΔS≠=95.1±29.0 JK−1mol−1. Thes
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47

Sukhikh, Stanislav, Svetlana Ivanova, Olga Babich, et al. "Antimicrobial Screening and Fungicidal Properties of Eucalýptus globulus Ultrasonic Extracts." Plants 11, no. 11 (2022): 1441. http://dx.doi.org/10.3390/plants11111441.

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The prohibition of antibiotics has led to extensive research and use of phytogenic feed additives. James Barrie Kirkpatrick described four subspecies of eucalyptus (family Myrtaceae), including Eucalýptus globulus, in 1974. The maximum concentrations of quercetin-3D-glycoside (1703.30 g/mL), astragalin (1737.82 g/mL), chlorogenic acid (342.14 g/mL), catechin (282.54 g/mL), rosmarinic acid (36.39 g/mL), and 3,4-dihydroxybenzoic acid (27.55 g/mL) were found in samples of ultrasonic extraction with ethyl alcohol (extraction module 1:5, temperature of 32 °C, an ultrasonic exposure time of 25 min).
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48

Ambauen, Muff, Mai, Hallé, Trinh, and Meyn. "Insights into the Kinetics of Intermediate Formation during Electrochemical Oxidation of the Organic Model Pollutant Salicylic Acid in Chloride Electrolyte." Water 11, no. 7 (2019): 1322. http://dx.doi.org/10.3390/w11071322.

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The present study investigated the kinetics and formation of hydroxylated and chlorinated intermediates during electrochemical oxidation of salicylic acid (SA). A chloride (NaCl) and sulfate (Na2SO4) electrolyte were used, along with two different anode materials, boron doped diamond (BDD) and platinum (Pt). Bulk electrolysis of SA confirmed the formation of both hydroxylated and chlorinated intermediates. In line with the density functional theory (DFT) calculations performed in this study, 2,5- and 2,3-dihydroxybenzoic acid, 3- and 5- chlorosalicylic acid and 3,5-dichlorosalicylic acid were
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Lin, Chih-Hao, Chuping Lee, Yu-Cheng Wu, and I.-Chung Lu. "New Strategy to Preserve Phosphate by Ionic Liquid Matrices in Matrix-Assisted Laser Desorption/Ionization: A Case of Adenosine Nucleotides." Molecules 25, no. 5 (2020): 1217. http://dx.doi.org/10.3390/molecules25051217.

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Adenosine -5′-triphosphate (ATP) plays a valuable role in metabolic activity to produce adequate energy in a biosystem. A high ATP/AMP ratio has a correlation with diabetes that induces suppression of AMP-activated protein kinase (AMPK). Matrix-assisted laser desorption/ionization (MALDI)–mass spectrometry (MS) has outstanding potential in determining the ratio of several types of adenosine phosphates in a sample to rapidly understand the primary energy transfer in metabolism. Although MALDI is viewed as a soft ionization technique for MS analysis, excess photon energy might crack the phosphat
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50

Tambe, Siddhi S., Rohini R. Pujari, Vishnu P. Chaudhari, and Sandesh Lodha. "MOLECULAR DOCKING AND ADMET BASED MINING OF NATURAL COMPOUNDS FROM PTEROCARPUS MARSUPIUM AGAINST PRIME TARGETS OF DIABETES MELLITUS." INDIAN DRUGS 61, no. 04 (2024): 16–29. http://dx.doi.org/10.53879/id.61.04.14318.

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In the Ayurvedic system of medicine, Pterocarpus marsupium Linn bark extract is used for the treatment of diabetes. It has a rich profile of chemical constituents. However, phytochemicals with antidiabetic activity are not reported yet. To comprehend more about this plant’s antidiabetic mechanism of action, 26 reported phytochemicals, namely, pterostilbene, marsupsin/ carpusin, 7-O-α-L-rhamnopyranosyloxy4′-methoxy-5-hydroxy isoflavone, (-)-epicatechin, pterosupin, liquiritigenin, vijayoside, pteroside, propterol-b, beta-eudesmol, pseudobaptigenin, isoliquiritigenin, garbanzol, 5-de-oxykaempfer
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