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The quenching effects of commercial available natural colorants against reactive oxygen species (ROS) were investigated. The effectiveness was evaluated by measuring the quenching ratio of chemiluminescence (CL) intensity with each colorant on luminol or methyl-6-(p-methoxyphenyl)-3,7-dihydroimidaz[1,2-a]pyrazin-3-one CL induced by ROS. As a result, the grape seed extracts and polyphenolics dose-dependently...
The quenching effects of non-water-soluble (NWS) and water-soluble (WS) rosemary extracts against active oxygen species were investigated by a chemiluminescent assay. The EC 50 values of the NWS extract for superoxide anion, singlet oxygen, hydroxy radical, hypochlorite ion and linolenic acid peroxide were 0.23+/-0.02, 0.89+/-0.06, 0.067+/-0.005, 0.098+/-0.009 and 0.020+/-0.004 mg/ml...
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