ABSTRACT Tea-like beverages were prepared from four sea algae (wakame, sea trumpet, hizikia, sea lettuce). The antioxidant properties of these beverages were investigated using four different methods, autoxidation test, superoxide anion radical, DPPH radical, and hydroxyl radical scavenging tests. Among them sea trumpet showed highly effects against autoxidation and the scavenging of superoxide anion radical. The antioxidant activities of these beverages correlated with the content of polyphenols. It suggests that these beverages has potential as pharmaceuticals to possess these functional properties such as strong antioxidant activities and scavenging activities of active oxygen species and have potential value in patients undergoing various diseases such as cancer, cardiovascular diseases, and diabetes
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