Liquid column chromatography, planar chromatography (TLC) on modified and unmodified silica layers, reversed-phase high-pressure liquid chromatography (HPLC), as well as ESI-TOF MS and 1H-NMR have been used for separation, purification and identification of phenolic acids in the barks of Sambucus nigra and Viburnum opulus (Caprifoliaceae). By the use of these procedures three cinnamic acid deri...

Plant phenolics and flavonoids have a powerful biological activity, which outlines the necessity of their determination. The phenolics and flavonoids content of 20 medicinal plants were determined in the present investigation. The phenolic content was determined by using Folin-Ciocalteu assay. The total flavonoids were measured spectrophotometrically by using the aluminium chloride colorimetric...

Cancer is the main leading cause of cancer deaths worldwide and chemotherapy is mainly used to treat cancer. However, the severe side effects of the drugs led the researchers to search for an alternative. Gallic acid, being a polyphenols, has been reported for its antiproliferative activity against many cancer cell lines. Moreover, its cytoprotective activity made gallic acid a potential compou...

A simple, rapid and sensitive method for the estimation of gallic acid has been developed. It is based on reduction of V(V) by gallic acid to V(IV) which forms complex with Eriochrome cyanine-R (ECR) in presence of cetyl trimethyl ammonium bromide (CTAB) resulting in a stable violet colored species. This showed maximum absorption at 580 nm. The calibration line was linear for gallic acid concen...

Tannase activity of bacteria capable of degrading tannin-protein complexes was determined by a newly developed visual reading method. The method is based on two phenomena: (i) the ability of tannase to hydrolyze methyl gallate to release free gallic acid and (ii) the green to brown coloration of gallic acid after prolonged exposure to oxygen in an alkaline condition. The method has been success...

Citation: Teodoro GR, Gontijo AVL, Salvador MJ, Tanaka MH, Brighenti FL, Delbem ACB, Delbem ÁCB and Koga-Ito CY (2018) Effects of Acetone Fraction From Buchenavia tomentosa Aqueous Extract and Gallic Acid on Candida albicans Biofilms and Virulence Factors. Front. Microbiol. 9:647. doi: 10.3389/fmicb.2018.00647 Effects of Acetone Fraction From Buchenavia tomentosa Aqueous Extract and Gallic Acid...

BACKGROUND Gallic acid (3,4,5-trihydroxybenzoic acid) is found in a wide variety of plants; it is extensively used in tanning, ink dyes, as well as in the manufacturing of paper. The gallate moiety is a key component of many functional phytochemicals. In this work electron paramagnetic spectroscopy (EPR) was used to detect the free radicals generated by the air-oxidation of gallic acid. RESUL...

BACKGROUND Theaflavins including theaflavin (TF), theaflavin-3-gallate (TF3G), theaflavin-3'-gallate (TF3'G), and theaflavin-3,3'-digallate (TFDG), are the most important bioactive polyphenols in black tea. Because of their poor systemic bioavailability, it is still unclear how these compounds can exert their biological functions. The objective of this study is to identify the microbial metabol...

A library of 600 taxonomically diverse Panamanian plant extracts was screened for DPPH scavenging and UV-B protective activities, and the methanolic extracts of Mosquitoxylum jamaicense, Combretum cacoucia, and Casearia commersionia were submitted to HPLC-based activity profiling. The compounds located in the active time windows were isolated and identified as gallic acid derivatives and flavon...

The aim of this study was to investigate in vitro antioxidant activity and anti-bacterial activity of the petroleum ether, ethyl acetate and methanol extract obtained from the whole part of Jurinea dolomiaea Boiss (Asteraceae). Total phenolic and flavonoid contents of these extracts were determined as gallic acid and rutin equivalents, respectively. Total antioxidant activity, reducing power of...