Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2020, Vol. 41 ›› Issue (3): 596-602.DOI: 10.3969/j.issn.1000-2561.2020.03.024

• Agricultural Product Processing, Preservation, Storage, Analysis and Detection • Previous Articles     Next Articles

Dissipation, Residues and Dietary Risk Assessment of Difenoconazole and Thifluzamide in Banana

ZHOU Min1,2,HE Xiufen2,DONG Cunzhu1,GE Huilin2,*()   

  1. 1. College of Plant Protection, Hainan University, Haikou, Hainan 570228, China
    2. Analysis and Testing Center, Chinese Academy of Tropical Agricultural Sciences / Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables, Haikou, Hainan 571101, China
  • Received:2019-06-21 Revised:2019-08-21 Online:2020-03-25 Published:2020-04-16
  • Contact: GE Huilin


A supervised residue trial was carried out in Yunnan in 2016 to study the digestion process of difenoconazole and thifluzamide in banana fruit, banana flesh and soil to analyze the residual digestion behavior and dietary intake risk in banana. The risk of long-term dietary exposure in China was assessed. The results showed that the linear equation of the standard curve of difenoconazole was y=1.45×10 7x+4.14×10 4, R 2=0.9962, and that of thifluzamide was y=2.99× 10 6x+1.43×10 4, R 2=0.9954. At the level of 0.04-1 mg/kg, the average recovery of difenoconazole was 75%-110%, and the relative standard deviation (RSD) was 0.9%-6.2%, while the average recovery of thifluzamide was 76%-114%, and RSD was 3.0%-9.5%. The limit of quantification (LOQ) of difenoconazole and thifluzamide in soil, banana fruit and banana flesh was 0.04 mg/kg, and the limit of detection (LOD) was 5 pg. The digestion of difenoconazole and thifluzamide was basically in accordance with the first-order kinetic equation. The half-life of difenoconazole in banana fruit and soil was 16 and 20 days, and the half-life of thifluzamide in banana fruit and soil was 20 and 27 days. Risk assessments indicated that the long-term dietary intake risk of difenoconazole in banana was acceptable, while thifluzamide had a certain long-term dietary risk.

Key words: banana, difenoconazole, thifluzamide, ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS), residue and dissipation, risk assessment

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