Zhengtian pills (ZTPs) are traditional Chinese medicine (TCM) which have been commonly used to treat headaches. Volatile components of ZTPs extracted by ethyl acetate with an ultrasonic method were analyzed by gas chromatography mass spectrometry (GC-MS). Twenty-two components were identified, accounting for 78.884% of the total components of volatile oil. The three main volatile components inc...

1878-3317/$ e see front matter Copyright 2011, Ta doi:10.1016/j.jecm.2010.12.005 A natural phenolic compound, protocatechuic acid (3,4-dihydroxybenzoic acid), is present in many edible and medicinal plants. Recent studies, including our animal experiments, indicate that this simple phenolic acid could be protective against the development of epithelial malignancy in different tissues and cardio...

Valsa mali var. mali (Vmm), the causal agent of apple tree canker disease, produces various toxic compounds, including protocatechuic acid, p-hydroxybenzoic acid, p-hydroxyacetophenone, 3-(p-hydroxyphenyl)propanoic acid and phloroglucinol. Here, we examined the relationship between toxin production and the pathogenicity of Vmm strains and determined their bioactivities in several assays, for fu...

The aim of this work is to investigate the synergistic antibacterial effect of phenolic compound mixtures against Listeria monocytogenes in brain heart infusion (BHI) medium, and to select the best mixture for testing their antibacterial activity in a meat model system. In BHI medium, the most effective mixtures were those of gallic and caffeic acids, gallic and protocatechuic acids, and rutin ...

A modified in vitro lipid peroxidation inhibition assay was used to guide the fractionation and the isolation of antioxidative principles of Fnnish pine bark extract. This approach yielded 3,4-dihydroxybenzoic acid (protocatechuic acid) and taxifolin-3-O-beta-glucopyranoside as major antioxidative compounds from the plant material. The structural elucidation of these compounds was undertaken wi...

WE shall present here an analysis of the linkage relationhsips among structural genes that control steps of the /3-ketoadipate pathway and two other dissimilatory pathways in a fluorescent pseudomonad, Pseudomonas putida. The convergent branches of the p-ketoadipate pathway (Figure 1 ) , which exists in many taxonomic groups of aerobic bacteria, provide a means for the conversion of certain aro...

Rhododendron formosanum is distributed widely in the central mountains in Taiwan and the major allelopathic compound in the leaves has been identified as (-)-catechin, which is also a major allelochemical of an invasive spotted knapweed in North America. Soil microorganisms play key roles in ecosystems and influence various important processes, including allelopathy. However, no microorganism h...

The effect of protocatechuic acid, tannic acid and trans-resveratrol on the activity of p-nitrophenol hydroxylase (PNPH), an enzymatic marker of CYP2E1, was examined in liver microsomes from acetone induced mice. trans-Resveratrol was found to be the most potent inhibitor (IC(50) = 18.5 +/- 0.4 microM) of PNPH, while protocatechuic acid had no effect on the enzyme activity. Tannic acid with IC(...