Esters gallic acid

In the rosary pea Abrus precatorius L. Trigollenine as well as its gallic acid ester Precatorine (209) is found (71P195) (Scheme 69). 1-Carboxymethyl-nicotinic acid (210) was isolated as a colorless solid from the marine sponge Anthosigmella cf. raromicrosclera as a cysteine protease inhibitor (98JNP671). This compound was first synthesized in 1991. The sodium... [Pg.127]

Flavanols/Procyanidins Catechin, epicatechin, and their gallic acid esters Apples, grapes, plums, pears, mangoes, okra, peaches, Swiss chard, berry fruits and vegetables in general,... [Pg.134]

Catechins (1.41) can also be found as gallic acid esters that are esterified at the 3 hydroxyl group. Note the difference between the gallic acid ester of catechin (1.41) and gallocatechin (1.40). [Pg.12]

The contents of the ampule are diluted in water to a final volume of 50 mL. A 1-mL sample is then taken for the assay. To this sample 1.5 mL 0.667% (w/v) rhodanine in methanol is added. After exactly 5 min. 1 mL 0.5N KOH is added. After 2.5 min. water is added to a final volume of 25 mL. The absorbance is read at 520 nm after a 5-10 min. incubation. A standard curve is made by reaction of gallic acid in 0.2N sulfuric acid with the rhodanine solution. Hagerman and Butler (1989) argued that this assay is more suitable than the potassium iodate assay for the determination of hydrolysable tannins, although it has to be kept in mind that the rhodanine assay is sensitive to any gallic acid ester, including those in non-tannin compounds. [Pg.156]

Backensfeld T, Keitel S, Lipp R. 1997. Low-dose steroid tablets that contain gallic acid ester as an antioxidant, process for production and use. U.S. patent 6,156,341. [Pg.87]

Epicatechin 3-O-gallate (flavan-3-ol gallic acid ester) Cinnamomum sp. (Lauraceae), Rheum palmatum (Polygonaceae), Camellia sinensis (Theacaeae) PEP (52 nM) [116]... [Pg.588]

Epicatechin 3-O-gallate (flavan-3-ol gallic acid ester)... [Pg.544]

Tri-O-galloylglucose (glucose gallic acid ester) Rheum palmatum (Polygonaceae) [rhizome] PEP... [Pg.545]

Desmanthin-1 (= 2 "-0-Galloylmyricitrin 2"-0-Galloylmyricetin-3-0-Rha) (flavonol glycoside gallic acid ester) Myrcia multiflora (Myrtaceae) [leaf] AR (rat lens) (0.08)... [Pg.638]

Vanhoenacker et al. 2001). Gallic acid is one of the HBA with the highest concentrations in wine. It not only originates from the grape itself but is also formed by hydrolysis of hydrolyzable and condensed tannins, i.e. the gallic acid esters of flavan-3-ols. [Pg.510]

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