In the light of the increasing burden of pollutants in major rivers and stringent environmental legislation, adaptation to eco-friendly treatment approaches is desperately required to decontaminate industrial effluents before its discharge to rivers and other fresh water-bodies. In present study, we have designed a simple and efficient method for removal of phenols from effluent wastewater usin...

Electrochemical oxidation of some p-substituted phenols (p-nitrophenol, p-hydroxybenzaldehyde, phenol, p-cresol, and p-methoxyphenol) with electron-donating and -withdrawing substituents was studied to reveal the relationship between the structure and the electrochemical reactivity of p-substituted phenols using a boron-doped diamond electrode by voltammetry and bulk electrolysis. Voltammetric ...

A series of p- and m-substituted phenols were examined for their effect on the cyclooxygenase activity of prostaglandin H synthase in 0.1 M phosphate buffer at pH 8.0 and 25.0 +/- 0.1 degrees C. A biphasic response was observed. At low concentrations phenols stimulate, but at higher concentrations inhibit, cyclooxygenase activity. Both enhancement and inhibition are increased by phenolic substi...

INTRODUCTION Phenols are the most abundant compounds in nature. They are strong antioxidants. Too high level of free radicals leads to cell and tissue damage, which may cause asthma, Alzheimer disease, cancers, etc. Taking phenolics with the diet as supplements or natural medicines is important for homeostasis of the organism. MATERIALS AND METHODS The ten most popular water soluble phenols w...

A rapid and sensitive method using pressure-assisted electrokinetic injection (PAEKI) as the on-line sample enrichment technique and electrospray-tandem mass spectrometry as the monitor has been developed for the determination of four halogenated phenols, 2,4,6-trichlorophenol, 2,4-dichlorophenol, 2,3,4,6-tetrachlorophenol and tetrabromobisphenol A, in water samples. In 8-min of injection, the ...

Phenols and their derivatives commonly exist in the environment. These compounds are used as the components of dyes, polymers, drugs and other organic substances. The presence of phenols in the ecosystems is also related with production and degradation of numerous pesticides and the generation of industrial and municipal sewages. Some phenols are also formed during natural processes. These comp...

Laccases are multi-copper oxidases widely distributed in plants, animals, insects and microorganism. These enzymes catalyze the one-electron oxidation of a wide range of organic and inorganic substances, including mono, di and poly phenols, aminophenols, methoxy phenols, aromatic amines and ascobate with the concomitant four electron reduction of oxygen to water. Laccase has the focus of much a...

ALTHOUGH it is easily demonstrated that when tyrosinase acts upon tyrosine 1-3:4-dihydroxyphenylalanine (dopa) is produced, it has hitherto not been clear why this is possible. Tyrosinase acts far more rapidly on dopa than on tyrosine, and dopa would therefore not be expected to accumulate in the reaction. However, from a mealworm tyrosinase-tyrosine reaction, which has proceeded 2-5 hr., dopa ...