Study on the Degradation Characteristics of Cypermethrin by Saccharomyces cerevisiae

The objective of this research was to investigate the effect of environmental factors on the degradation characteristics of cypermethrin by Saccharomyces cerevisiae with high tolerance and degradation rate on cypermethrin,and to discuss the internal relations between degradation rate of cypermethrin and biomass of the strain.The results indicated that environmental factors had a significant effect on the degradation of cypermethrin by Saccharomyces cerevisiae.Meanwhile,the optimum conditions for degradation of cypermethrin were as follows: cypermethrin 200mg.L-1,initial pH 7.0,substrate 20mL,inoculum 5%(v/v,3.0×107cells/mL),rotation speed 140 r.min-1,incubation temperature 31°C and incubation period 96h,then the degradation rate of cypermethrin reached 38.52%.