›› 1998, Vol. 41 ›› Issue (-1): 12-18.

• RESEARCH PAPERS • Previous Articles     Next Articles

INHIBITION OF ORGANOPHOSPHATE INSECTICIDES TOCARBOXYLESTERASE IN HELICO VERPA ARMIGERA

Wang Xu Gao Xiwu Zheng Bingzong Li Haitao   

  • Online:1998-12-20 Published:1998-12-20
  • Contact: Gao Xiwu

Abstract: The inhibition of 22 organophosphates (OP) to the activity of carboxylesterase, usinga-and β-naphthyl acetate as substrate separately, was investigated in cotton bollworms ( Helicoverpaarmigera ). The inhibition potential of paraoxon, dichlorvos, SV1, quinalphos, malaoxon, IBP were much stronger than the other insecticides tested. The relationship between chemical structureand the inhibition potential to carboxylesterase was also studied. The inhibition potential was: phosphate > phosphorothionate, phosphorothiolate > phosphorodithioate, phosphoramidate > phosphorothiolamidate and (C2H5O)2OP > (CH3O)2OP.

Key words: organophosphate insecticide, carboxylesterase, median inhibiting concentration