Zhejiang East Asia Pharmaceutical Co., Ltd.

In this study, an ambient mass spectrometry (AMS) based method was developed for rapid detection of organophosphorus pesticides in strawberry.This method combines an elec. arc and a microsyringe tip to realize tip-assisted ambient elec. arc ionization (TAAEAI).A high-voltage elec. arc can be applied to the microsyringe tip to generate an elec. field, which results in corona discharge at the microsyringe tip.The juiced strawberry sample loaded on the tip could be directly ionized with TAAEAI and then analyzed by a mass spectrometer.TAAEAI-MS was successfully applied to analyze 6 organophosphorus pesticides in three strawberry samples.Malathion and profenofos were detected from the investigated strawberry samples.This method could quant. the contents of organophosphorus pesticides in strawberry with high reproducibility, high precision, and high sensitivity.Sample matrixes did not interfere with the pesticide anal.The recoveries of organophosphorus pesticides spiked in strawberry samples varied between 82.6% and 116% with relative standard deviations (RSDs) less than 9.2%.The limits of detection (LODs) varied between 0.0124μg/g and 0.0245μg/g, while the limits of quantification (LOQs) varied between 0.0413μg/g and 0.0817μg/g.The coefficients of determination (R2) of the method were determined to be > 0.995.The method established here may have potential application in the detection of organophosphorus pesticides in vegetables and fruits.