The most efficient steaming conditions below 200 degrees C for extracting antioxidants from used tea leaves and their reaction behavior during the steaming treatment were investigated. The antioxidative activity of the steamed extracts increased with increasing steaming temperature, and the yield of the ethyl acetate extract fraction from each steamed extract showing the greatest antioxidative ...

Carob has been used by humans since antiquity. Its major use is food, but traditional medicines of many nations it for treatments various health disorders. The fruits (pods or kibbles) were the main source nutrition and medicinal uses, decoctions extracts prepared from other parts tree, especially leaves. Modern science analyzed most chemical compositions different parts, among phytochemicals t...

Ethanol metabolites may directly or indirectly induce oxidative stress as a result of disturbed balance between proand antioxidative processes. An indirect effect of ethanol on the generation of oxidative stress is associated with the attenuation of intracellular defensive enzymatic antioxidants, e.g. gluthatione peroxidase, catalase, superoxide dismutase as well as waterand/or fat-soluble low-...

Factors such as oxidative stress and reduced acetylcholine level have been implicated in Alzheimer’s disease (AD) pathology and recently there has been a trend towards natural product research to find potential sources of antioxidants and acetylcholinesterase inhibitors in the plants kingdom. Centaurea is a genus with about 500 species world wild, many of them have shown to possess bio...

the essential oils of branchlets and fruits of juniperus excelsa subsp. excelsa and juniperus excelsa subsp. polycarpos were examined for their antioxidant activity. the compositions of the essential oils were studied by gc and gc-ms. to evaluation the antioxidants activity of the volatile oils, pure components and positive controls at different concentrations, thin-layer chromatography (tlc) s...

Natural polyphenol compounds are often good antioxidants, but they also cause damage to cells through more or less specific interactions with proteins. To distinguish antioxidant activity from cytotoxic effects we have tested four structurally related hydroxyflavones (baicalein, mosloflavone, negletein, and 5,6-dihydroxyflavone) at very low and physiologically relevant levels, using two differe...

As interest in the study of antioxidant intake from foods and other agricultural products increases, methods for performing radical scavenging activity assays based on the electron paramagnetic resonance spectroscopic method, in which there is no interference from the sample color and turbidity, are required. In this study, we have developed a rapid and simple electron paramagnetic resonance ba...