a.1.(Chem.) Pertaining to, derived from, or designating, an organic acid which is obtained as a white crystalline substance from catechin, asafetida, oil of cloves, etc., and by distillation itself yields pyrocatechin.
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The bioactive compounds in mango peel extracts recently identified by HPLC were protocatechuic acid, gentisic acid and gallic acid, syringic acid, mangiferin, ellagic acid, gentisyl-protocatechuic acid and quercetin in both raw and ripe peels.
In another pathway, 1-hydroxy-2-naphthoic acid undergoes ring-cleavage and is further metabolized via o-phthalic acid and protocatechuic acid [16].
The carboxylic acids used in this study were oxalic acid (OX), malic acid (MAL), citric acid (CIT), 4-hydroxybenzoic acid (HB), protocatechuic acid (PCH), 4-hydroxycinnamic acid (HC; also known as p-coumaric acid), and caffeic acid (CAF).
This resulted in the isolation and characterization of protocatechuic acid (5), the predominant degradation product.
In a previous study we have shown that protocatechuic acid, a major metabolite of the anthocyanins, inhibits monocyte adhesion and reduces atherosclerosis in apolipoprotein E-deficient mice (40).
Anti-oxidant phenylethanoid glycosides reported from the plant along with protocatechuic acid, acteoside, jionoside D, isoacteoside, martynoside, and a rhamnosyl derivative of sisymbrifolin (Martin et al.
5 [micro]M), a hydroxybenzoic acid derivative like protocatechuic acid (1.
Moreover the results might have been caused by phenolic compounds in Roselle, such as protocatechuic acid and anthocyanin, which are reported to have antioxidant properties (Wang et al.
The scavenging activity of the extract on ROS was correlated to its protocatechuic acid content (Yen and Hsieh 2000).
p-hydroxybenzaldehyde, gallic, protocatechuic, etc.
Only the presence of baked muffin limited the release of protocatechuic acid and luteolin in the gastric and duodenal compartments.
Danshensu, protocatechuic aldehyde, protocatechuic acid, salvianolic acid A, salvianolic acid B, salvianolic acid C, salvianolic acid D, lithospermic acid, rosmarinci acid, caffeic acid, ferulaic acid, tanshinone I, tanshinone IIA, cryptotanshinone and dihydrotanshinone I were bought from Chengdu Must Bio-technology Co.