[Objective] To explore the optimal conditions for extracting polysaccharide from Auricularia auricular,and to study its physiochemical properties and antibacterial activities.[Method] The extraction conditions for Auricularia auricular polysaccharides were optimized by orthogonal test,and its physiochemical characteristics and antagonistic activities on bacteria and molds were tested.[Result] The optimized condition was with sample to liquid ratio of 1:50,temperature of 90 ℃ and extraction time of 2.5 h.Under the optimized condition,the yield of polysaccharide was 7.3%,with polysaccharide content of 77.81 %.Containing aldose and amylase,the polysaccharides of Auricularia auricular was soluble in water.The inhibitory effect on bacteria was significantly stronger than on molds that the minimum diameter of inhibition zone for bacteria is 12.7 mm,while 7.9 mm for the molds.[Conclusion] This study provides scientific basis for the development and utilization of Auricularia auricular polysaccharides.
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