Residues of neonicotinoids insecticides in different parts of apple fruits
Received:January 10, 2019    Download the full
DOI:10.16801/j.issn.1008-7303.2019.0068
Key Words:neonicotinoids  apple  bagged fruit  residue  transformation  thiamethoxam  nitenpyram  imidacloprid
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Author NameAffiliationE-mail
LU Haibo Forestry College, Hebei Agricultural University, Baoding 071000, Hebei Province, China
Hebei North University, Hebei Key Laboratory of Quality & Safety Analysis-Testing for Agro-Products and Food, Zhangjiakou 075000, Hebei Province, China 
 
WEI Dong Hebei North University, Hebei Key Laboratory of Quality & Safety Analysis-Testing for Agro-Products and Food, Zhangjiakou 075000, Hebei Province, China  
GONG Xuechen Hebei North University, Hebei Key Laboratory of Quality & Safety Analysis-Testing for Agro-Products and Food, Zhangjiakou 075000, Hebei Province, China  
HUANG Zhihong Hebei North University, Hebei Key Laboratory of Quality & Safety Analysis-Testing for Agro-Products and Food, Zhangjiakou 075000, Hebei Province, China  
GAO Baojia Forestry College, Hebei Agricultural University, Baoding 071000, Hebei Province, China baojiagao@163.com 
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Abstract:
      To investigate the transformation of neonicotinoids insecticides(thiamethoxam, nitenpyram, imidacloprid, acetamiprid, clothianidin, dinotefuran)in different parts of apple fruits, the selected 10 years old apple trees were sprayed with 6 neonicotinoids insecticides on leaves during the period of the aphid outbreak (July 10th) and the maturation stage before harvest 1 d (September 25th), respectively. The residues and characteristics of 6 neonicotinoids insecticides distribution in different tissues of bagged apple, non-bagged apple and fruits in storage were analyzed by HPLC and external standard method. The results showed that contents of the 6 neonicotinoids insecticides in different tissues of the fruits tended to increase first and the decrease gradually in 72 h after the spraying under the fruit bagged condition. The residues in apple peel were all lower than 0.08 mg/kg, while the residues in pulp and carpopodium were significantly higher than that in the peel. The residues of nitenpyram and imidacloprid in peel were lower than the quantity limit. The results indicated that the neonicotinoids insecticides in bagged fruits derived from the transportation in the branches and leaves, and it went into the fruits via the carpopodium and tended to accumulate in the pulp. 72 h after the spraying, the neonicotinoids insecticide contents in the pulp of then on-bagged fruits was 7.75, 3.52, 3.36, 6.57, 2.92 and 3.06 times higher than those of the bagged fruits, respectively. The fruits bagging could lower down the neonicotinoids insecticide residues in the fruits significantly. After spraying on the fruits at the maturation stage before harvest, the residues were mainly in apple peel. 14 d and 21d after spraying, there was no residue detected in apple pulp. The neonicotinoids insecticide residues mainly remained in the peel, which did not tend to diffuse to the pulp during storage.
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