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Effects of dietary selenium supplementation on the activities of two antioxidant enzymes in Caridina denticulata sinensis exposed to ambient parathion

WANG Hong-wei,YANG Li-kun,ZHAO Jian-hua,JIANG Yu-mei,LI Ling,ZHANG Lan-jun(College of Life Science,Hebei University,Baoding 071002,China)  
The effects of dietary selenium supplementation on superoxide dismutase(SOD) and catalase(CAT) of Caridina denticulata sinensis exposed to ambient parathion were investigated.The shrimps were fed with inorganic selenium or organic selenium in the diet.Results showed that the 24 h,48 h,72 h and 96 h LC50 values of parathion were 15.40,8.73,4.59 and 1.09 μg/L.The activities of SOD and CAT were observed after 24 h of exposure to parathion with series concentration less than 1.09 μg/L.The activities of SOD and CAT fluctuated with the increasing of parathion concentration.Compared with the shrimps fed with inorganic selenium,the shrimps fed with organic selenium had a higher index of SOD and CAT activity.According to the results,there is a higher absorptance of Caridina denticulata sinensis to proper organic selenium than inorganic selenium.
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