Residue changes of 4 kinds of fungicides in the preliminary processing of Bletilla striata
To identify the changes and processing factors of carbendazim,triadimefon,tebuconazole and difenocon-azole 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 chro-matography-tandem mass spectrometry(UHPLC-MS/MS)method was used to detect the pesticide residue concentra-tions 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 by38.6%to67.8%,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 con-centration effect,which could reduce the residual risk of the four fungicides in dry B.striata products,the process-ing factor of whole process ranged from 0.34 to 0.67.Therefore,it was feasible to evaluate the safety of four fungi-cide residues in dried B.striata after this preliminary processing by using four fungicide residues in fresh Bletilla stri-ata.The research results could provide basic data reference for the safety risk assessment of B.striata products.
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