Bis-(2-amino-5-selenazoyl) Ketone as a Superoxide Anion-Scavenger

We investigated the superoxide anion scavenging effects of 2-amino-1, 3- selenazoles and bis-(2-amino-5-sele-nazoyl) ketones using a highly sensitive quantitative chemiluminescence method. At 166 μM, the 2-amino-1, 3-sele-nazoles and bis-(2-amino-5-selenazoyl) ketones scavenged in the range of 10.0 to 80.0% of O2-. Bis[2-dimethyl-amino-5-(1, 3-selenazolyl)] ketone exhibited the strongest superoxide anion-scavenging activity among the six kinds of 2-amino-1, 3-selenazoles and three kinds of bis-(2-amino-5-selenazoyl) ketones. The 50% inhibitory concentration (IC50) of bis[2-dimethylamino-5-(1, 3-selenazolyl)] ketone was determined to be 37.1 μM. Thus, bis[2-dimethylamino-5-(1, 3-selenazolyl)] ketone acted in vitro as effective and potentially useful O2- scavenger.