Residue Analysis and Dietary Risk Assessment of Metalaxyl in Chinese Bayberry and <i>Dendrobium officinale</i>
Xiaomei Wang | Nan Fang | Xiangyun Wang | Yanjie Li | Jinhua Jiang | Yuqin Luo | Xueping Zhao | Changpeng Zhang | Qiang Wang
Metalaxyl is frequently used to protect a variety of crops from fungal diseases. This study aims to establish a method for the determination of metalaxyl in Chinese bayberry, fresh <i>Dendrobium officinale</i> (<i>D. officinale</i>), and dried <i>D. officinale</i> by gas chromatography-tandem mass spectrometry (GC-MS/MS) and further assess dietary risk. The samples were extracted with acetonitrile and purified by the dispersed solid phase extraction method. Chinese bayberry, fresh <i>D. officinale,</i> and dried <i>D. officinale</i> samples were collected from Hangzhou and Zhangzhou in 2021 to clarify metalaxyl residue levels. The metalaxyl was quantitated by the external standard method. In the range of 0.001–0.1 mg L<sup>−1</sup>, there was good linearity under the optimal conditions. The recoveries ranged from 83.90% to 110.47%, with relative standard deviations ranging from 0.86% to 5.81%. The detection rates in Chinese bayberry, fresh <i>D. officinale,</i> and dried <i>D. officinale</i> were 97.92%, 49.29%, and 50.71%, respectively. The dietary risk of metalaxyl residues in Chinese bayberry, fresh <i>D. officinale,</i> and dried <i>D. officinale</i> was acceptable for consumers.
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