食品科学 ›› 2006, Vol. 27 ›› Issue (3): 179-183.

• 分析检测 • 上一篇    下一篇

兔血清乙酰胆碱酯酶用于农药残留速测的最佳条件研究

 王文祥, 胡美英, 刘萱清, 蒲小明, 钟国华   

  1. 华南农业大学昆虫毒理研究室农药与化学生物学教育部重点实验室
  • 出版日期:2006-03-15 发布日期:2011-09-06

Study on Optimal Conditions of Assaying Pesticides Residue through Inhibition of Rabbit Serum Acetylcholinesterase

WANG  Wen-Xiang, HU  Mei-Ying, LIU  Xuan-Qing, PU  Xiao-Ming, ZHONG  Guo-Hua   

  1. Lab of Insect Toxicology, South China Agricultural University, Key Lab of Pesticide Chemical Biology,Ministry of Education, Guangzhou 510640, China
  • Online:2006-03-15 Published:2011-09-06

摘要: 研究了磷酸缓冲液pH值、反应时间、反应温度、底物、酶量对兔血清乙酰胆碱酯酶(AChE)活力测定的影响,结果表明,供试AChE活力最佳条件是:磷酸缓冲液(pH8.0)3.0ml,显色剂0.6%二硫双对硝基苯甲酸(DTNB)50μl,0.75%酶液(pH8.0)100μl,反应温度35℃,混匀稳定后加入底物1%碘化硫代乙酰胆碱(BTCI)50μl,反应180s后在412nm处测定光密度。在上述条件下,测定表明有机磷杀虫剂丙硫磷(Prothiofos)浓度在0.0125~0.4μg/ml,保育时间5~30min之间与AChE抑制率之间存在良好的相关性,可根据检测需要调整保育抑制时间。本试验结果将为应用兔血清AChE研制、改进有机磷和氨基甲酸酯类农药残留速测卡,实现农产品、食品农药残留快速检测提供重要参考。

关键词: 农药残留, 快速检测, 乙酰胆碱酯酶, 丙硫磷

Abstract: The conditions were studied for assaying of acetylcholinesterase (AChE) activity from rabbit serum, as the targetenzyme of organophosphate and carbamate pesticide. The results showed that the optimal reaction conditions were: 3.0ml of pH8.0buffer solution of phosphoric acid, 50μl of 0.6% DTNB and 100μl of 0.75% AChE were mixed with 50μl of 1% BTCI at 35℃,and then value detected of OD412 after 180s. The AChE activity showed good inhibition effect on the prothiofos, anorganophosphate pesticide, with 0.0125~0.4μg/ml as the concentration range and / or 5 ̄30 min as incubation time under the abovecondition. It indicated that the assay time could be adjusted. These results would be important to the R&D of rapid detectioncard for assaying pesticide residue by rabbit serum AChE and improveing test accuracy.

Key words:  , pesticide residue; rapid detection; acetylcholinesterase; prothiofos;