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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (17): 106-112.doi: 10.11924/j.issn.1000-6850.casb2023-0097

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Elimination of False Positive of Agricultural Residues in Sulfur-Containing Vegetables by Enzyme Inhibition Method

WANG Wen(), WANG Lifang, ZHANG Yu, CAO Lifen, GUO Baikun, WANG Bin()   

  1. Hangzhou Yuhang Food and Drug Monitoring & Testing Center, Hangzhou 311199
  • Received:2023-02-15 Revised:2023-04-05 Online:2023-06-15 Published:2023-06-12

Abstract:

Taking garlic as the research object, this paper established a false positive elimination technique for detecting pesticide residues in sulfur-containing vegetables by enzyme inhibition method. Combing the production principle of allicin and its effect on enzyme inhibition reaction, the pretreatment effects of microwave treatment, water bath treatment, phosphoric acid treatment and cysteine treatment and their effects on the recovery rate of pesticide were compared. The results showed that garlic samples treated with 15% phosphoric acid for 5 min had the best alliinase inactivation effect, which could effectively eliminate the false positive results caused by allicin inhibitory enzyme activity, and the average recovery rate of pesticide could reach 81.75%. Other three treatments had the problems of low recovery rate or could not be widely applied. The optimized phosphoric acid treatment was used for the determination of six representative sulfur-containing vegetables, which could achieve the desired effect and had no effect on the subsequent enzyme inhibition reaction. This method can be applied in the rapid detection of pesticide residues in sulfur-containing vegetables by enzyme inhibition method.

Key words: garlic, sulfur-containing vegetables, enzyme inhibition method, eliminate, false positive