College of Biosystems Engineering and Food Science, Zhejiang Key Laboratory of Agro-Food Processing, Zhejiang R&D Center of Food Technology and Equipment, Fuli Institute of Food Science, Zhejiang University, Hangzhou, China.
Ningbo Research Institute, Zhejiang University, Ningbo, China.
Food Sci Technol Int. 2023 Jul;29(5):510-517. doi: 10.1177/10820132221096995. Epub 2022 Apr 28.
Fungicides are often used to extend the storage time of postharvest satsuma mandarin fruit. In recent years, fungicide residue has become an issue of food safety. This study aimed to investigate the distribution and migration of three typical fungicides (imazalil, prochloraz, thiophanate-methyl) in postharvest satsuma mandarins using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Three fungicides could quickly penetrate satsuma mandarins and their gradient concentrations of residues in the fruit were: carpopodium > mesocarp > epicarp > pulp. However, the residues of three fungicides in the edible pulp were obviously lower than the maximum residue limit (MRL = 5.0 mg/kg in China). Residues of the three fungicides decreased in epicarp and carpopodium but increased in mesocarp and pulp during storage. Fungicides could quickly penetrate the fruit, settling primarily in the carpopodium but little in the pulp. Both epicarp and carpopodium were the breakthrough pathways for the fungicides entering the fruit, while epicarp was the main route for the penetration of fungicides. These findings shed new information on the behavior of fungicides and the safety issue of satsuma mandarins.
杀菌剂常用于延长采后温州蜜柑的贮藏时间。近年来，杀菌剂残留已成为食品安全问题。本研究采用液相色谱-串联质谱法（LC-MS/MS）研究了三种典型杀菌剂（咪鲜胺、丙环唑、噻菌灵）在采后温州蜜柑中的分布和迁移情况。三种杀菌剂可快速穿透温州蜜柑，其在果实中的残留浓度呈梯度分布：果蒂>囊衣>中果皮>果肉。然而，三种杀菌剂在可食用果肉中的残留量明显低于最大残留限量（MRL=中国 5.0mg/kg）。在贮藏过程中，三种杀菌剂在果皮和果蒂中的残留量减少，但在中果皮和果肉中的残留量增加。杀菌剂可快速穿透果实，主要分布在果蒂，但在果肉中分布较少。果皮和果蒂都是杀菌剂进入果实的突破途径，而果皮是杀菌剂渗透的主要途径。这些发现为杀菌剂的行为和温州蜜柑的安全问题提供了新的信息。
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