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Denoting a chemical compound containing three replaceable hydrogen atoms.
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A C20 cyclic trihydroxy unsaturated fatty acid was isolated and characterized from the aquatic sedge Eleocharis microcarpa Torr.
Resveratrol, a trihydroxy derivative of stilbene (3,5,4-trihydroxy-trans- stilbene) that exists in isomeric trans and cis forms, is a naturally occurring polyphenolic phytoalexin that can be isolated from red grapes (predominantly from grape skin), berries, peanuts, and red wine [28].
An oxylipin corresponding to peak 24, was identified as trihydroxy octadecenoic acid ([C.sub.18][H.sub.33][O.sub.5.sup.-]) with a m/z 329.23328 amu (Rt 18.28 min), determined by its small difference in ppm (0.21262) with the theoretical mass ion; this compound has been previously reported in A.
identification 1 Aloesin or aloeresin B 2 Chlorogenic acid 3 Caffeic acid 4 Aloe emodin- diglucoside 5 Isoquercitrin 6 Kaempferol-3-O- hexosyl-O-pentoside 7 6-Methyl-1,3,8- trihydroxyanthraquinone (emodin) 8 Luteolin-8-C-glucoside (orientin) 9 Feruloylquinic acid 10 10-Hydroxyaloin A 11 Isovitexin 12 Chrysoeriol-7- O-glucuronide 13 Caffeoyl ester of aloesin 14 Aloin A 15 Isoaloeresin D 16 2'-p- Methoxycoumaroyla- loeresin B 17 4,5-Dimethyl ether of Aloe emodin 18 Aloin B 19 6'-Malonylnataloin 20 Naringenin-4'-methoxy- 7-O-glucuronide 21 7-Methylether of 2'- feruloylaloesin 22 Aloe emodin-8-O- glucoside 23 5,3'-Dihydroxy-6,7,4'- trimethoxyflavone (eupatorin) 24 Trihydroxy octadecenoic acid 25 3,4-Di-O-caffeoyl- quinic acid Peak Elemental Retention no.
Resveratrol (R) is a trihydroxy derivative of stilbene (3,5,4-trihydroxystilbene) that is present in grapes, berries, peanuts, and red wine [21].
It has been proposed that the antioxidant activity of HBA depends on the number of hydroxyl groups in a molecule [18] and that it increases following the order: monohydroxy, dihydroxy, and trihydroxy, respectively [19].
Anthrarobin (1, 2, 10 trihydroxy anthracene) shows a very significant antioxidant potential at the concentrations used (Fig.
On the basis of above mentioned results it is concluded that anthrarobin (1, 2, 10 trihydroxy anthracene) is found to have significant antioxidant activity but none of its derivatives have good potential to scavenge free radicals created by DPPH or alkaline DMSO.
2,3,4- Trihydroxy analog 1 was found to be third most active among the series with IC50 value of 102.66 1.5 M.
Zinc chloride (ZnCl2, purity=98.0%) and trihydroxy aminomethane (Tris, BR) were provided by Shantou Xilong Chemical Corporation of Guangdong and Sino-American Biotechnology Company of Shanghai, respectively.
Fulgidic acid, an unsaturated trihydroxy C18 fatty acid, effectively suppressed the LPS-induced production of proinflammatory cytokines and various inflammatory mediators through inactivation of AP-1 transcription factor when compared to another active compound, pinellic acid [67].
Herein, 15 thyme honey samples from several regions of Greece were submitted to phytochemical analysis for the isolation, identification and determination (through modern spectral means) of the unique thyme honey monoterpene, the compound trihydroxy ketone E-4-(1,2,4-trihydroxy-2,6,6- trimethylcyclohexyl)-but-3-en-2-one.