Both green tea and Se-enriched green tea have been reported to exhibit antimutagenic and cancer chemopreventive
properties [10]. Oxidative modification of DNA, proteins,
lipid and small cellular molecules by reactive oxygen species
(ROS) plays a role in a wide range of common diseases
and age-related degenerative conditions. Our previous study
showed that Se-enriched green tea exhibited significantly
higher in vitro antioxidant activities than regular green tea
[11, 12]. It is of great interest to investigate the antioxidant
contributions of tea polyphenols, tea polysaccharides and tea
proteins. However, there are many systems to assess the antioxidant power of the specific substances. In the paper, two
common antioxidant methods used widely all over the world
(AAPH and DPPH radical scavenging methods) were applied
to compare the antioxidant activities of crude tea polyphenols, polysaccharides and proteins from Se-enriched tea and
regular green tea.