Study on the Determination Method and Stability of Nitenpyram Residue in Lycium barbarum
In this paper,a method was established for the determination of the residues of nitenpyram in Lycium barbarum.The samples were extracted with methanol,purified by PSA and C18,detected by ultra performance liquid chromatography-mass spectrometry(HPLC),and quantified by external standard method.The results showed that there was a good linear relationship in the range of 0.01～1.00 mg·L-1,and the correlation coefficient was greater than 0.999.The average recoveries were 73.1％～86.1％and the relative standard deviations were 2.6％～6.7％at three supplemental levels(0.01,0.10 and 1.00 mg·kg-1).The limit of quantitation was 0.01 mg·kg-1.At-18 ℃ and storage time of 11 months,the degradation rate of nitenpyram in Lycium barbarum was less than 30％.This method has high accuracy and precision,which is a practical analysis method.
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