Estimation of free radical-quenching activity of leaf pigment extracts

被引:81
作者
Arnao, MB [1 ]
Cano, A [1 ]
Alcolea, JF [1 ]
Acosta, M [1 ]
机构
[1] Univ Murcia, Dept Plant Biol Plant Physiol, Murcia 30100, Spain
关键词
anti-oxidant activity; free radical; ABTS; decolouration method; carotenoids; leaves; barley; oat; citrus;
D O I
10.1002/pca.571
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
The chromogen 5,2'-azino-bis-(3-ethylbenzthiazoline-6-sulphonic acid) radical (ABTS(.+)) can be directly generated by the enzymatic system formed by hydrogen peroxide and horseradish peroxidase in ethanolic media. The reaction is time- and concentration-dependent, and the ABTS(.+) generated shows excellent stability. The method is an adaptation of the decolouration method previously reported (Cano et al. 1998, Phytochem Anal 9:196-202), which was used for estimating anti-oxidant activity in aqueous media. When the assay described here was used to quantity the anti-oxidant activity of two anti-oxidants, Trolox (an analogue of vitamin E) and beta -carotene, the latter had 2.5 times better anti-oxidant capacity than Trolox at the same concentration. The free radical quenching activity (anti-oxidant activity) of leaf pigment extracts was measured and related to the the carotenoid contents in leaf extracts of barley, oat and citrus. The possibilities of using this experimental approach to evaluate the status of photoprotective pigments are discussed. Copyright (C) 2001 John Wiley & Sons, Ltd.
引用
收藏
页码:138 / 143
页数:6
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