for the first time in the present study the effects of vanillin, vanillyl alcohol, vanillic acid, as well as the newly synthesized vanillin derivative, bis-vanillin, were investigated on the oxidation of dopamine hydrochloride by mushroom tyrosinase. among them, vanillin and bis-vanillin act as activators, while vanillyl alcohol and vanillic acid exhibited inhibitory effects, the ic50 values be...

A reversed-phase liquid chromatographic separation with pulsed amperometric detection of phenolic acids at a glassy carbon electrode is described. Chromatographic separation was carried out in isocratic conditions using 0.20 mol·L-1 acetic acid (pH 5.0)/water (80 : 20, v/v) as mobile phase under constant working potential mode of 0.80 V. Chromatographic peaks presented high resolution and separ...

Aerva lanata (Linn.) Juss. ex Schult. (Family-Amaranthaceae) is an important source of chemicals of immense medicinal and pharmaceutical importance such as O-acyl glycosides, β-sitosterol, daucosterol, syringic acid, vanillic acid, feruloyl tyramine, feruloyl homovanillylamine, narcissin and aervitrine which are effective as diuretic, anthelmintic, antidiabetic, expectorant and in the treatment...

The residual biodegradation products of wheat straw lignin attacked by Cyathus stercoreus for thirty days were identified. Low-molecualr-weight nonvolatile materials constituted less than 5% of the total 14C released from labeled lignin. In this portion, syringic acid, vanillic acid, p-hydroxy benzoic acid, acetic acid, and 2-methoxy-succinic acid were found. The majority of the water-soluble b...

Aim. This study investigated the efficacy of vanillic acid against selected pathogenic bacteria obtained from clinical samples. Method. The antibacterial collected samples was studied using a broth macrodilution method. minimum inhibitory concentration determined by treating each isolate with increasing amounts ranging 150 to 2000 µg/ml. Results. lowest concentrations found were 600 µg/ml for S...

Fourteen aromatic and 24 aliphatic acids were determined by GC-MS analysis of acidic fractions obtained from Paeonia peregrina and Paeonia tenuifolia roots. Benzoic acid and its monohydroxy-, dihydroxy- and trihydroxy-derivatives are the main acid components of both Paeonia species. Some fractions could serve as a source of benzoic, 4-hydroxybenzoic, vanillic and gallic acids, as well as of eth...

The biosynthetic pathway of capsinoid in 'CH-19 Sweet' was investigated. [(3)H]Valine and [(14)C]phenylalanine were injected into the fruits of the intact plant. Both of radioactivities were detected in capsinoid fractions. (14)C radioactivity was observed in phenylpropanoid compounds, and in vanillin, vanillylamine, vanillyl alcohol, and vanillic acid. We confirmed that capsinoid is biosynthes...

The effect of water stress and herbicide treatment on the phenolic compound concentration and photosynthesis rate in transgenic Codonopsis lanceolata plants over-expressing the γ-tmt gene was investigated and compared to that in control non-transgenic C. lanceolata plants. The total phenolic compound content was investigated using high-performance liquid chromatography combined with diode array...