Acta Agriculturae Zhejiangensis ›› 2024, Vol. 36 ›› Issue (7): 1677-1685.DOI: 10.3969/j.issn.1004-1524.20231046

• Quality and Safety of Agricultural Products • Previous Articles     Next Articles

Residue changes of 4 kinds of fungicides in the preliminary processing of Bletilla striata

SHI Guiyuan1,2(), HUANG Wenyuan2,3, DUAN Tingting2, LI Ming2, GUO Yiqing1,*(), ZHANG Ying2,3,*()   

  1. 1. College of Plant Protection, Yunnan Agricultural University, Kunming 650500, China
    2. Institute of Plant Protection, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
    3. Guizhou Center for Pesticide Risk Monitoring, Guiyang 550006, China.
  • Received:2023-08-31 Online:2024-07-25 Published:2024-08-05

Abstract:

To identify the changes and processing factors of carbendazim, triadimefon, tebuconazole and difenoconazole residues during preliminary processing of Bletilla striata. The three preliminary processing processes (washing, boiling and drying) of B. striata were simulated under laboratory conditions, the ultra high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) method was used to detect the pesticide residue concentrations at each stage of the preliminary processing of B. striata, and the processing factors were calculated. The results showed that there were great differences in the effects of different processing techniques on the residual concentrations of the four fungicides in B. striata. The washing process reduced the concentration of pesticide residues by 4.6% to 57.8%, and the processing factor ranged from 0.42 to 0.95. Adding 2% starch, 2% salt, and 2% baking soda to clean water could increase the pesticides removal rate by 1.4 to 7.3 times. The boiling process could reduced the concentration of pesticide residues by 38.6% to 67.8%, and the processing factor ranged from 0.32 to 0.61. The oven drying process, due to the concentration effect, the pesticide residue concentration increased by 2.1 to 3.2 times, and the processing factor ranged from 2.08 to 3.23. The whole process of washing with 2% salt solution, boiling for 4 min, oven drying at 60 ℃ had a greater degradation effect on the four fungicides than oven drying concentration effect, which could reduce the residual risk of the four fungicides in dry B. striata products, the processing factor of whole process ranged from 0.34 to 0.67. Therefore, it was feasible to evaluate the safety of four fungicide residues in dried B. striata after this preliminary processing by using four fungicide residues in fresh Bletilla striata. The research results could provide basic data reference for the safety risk assessment of B. striata products.

Key words: Bletilla striata, fungicide, residue change, preliminary processing, processing factor

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