Residual pattern of FENHEXAMID (cas 126833-17-8) on pepper fruits grown under greenhouse conditions using HPLC and confirmation via tandem mass spectrometry

Add time:07/29/2019    Source:sciencedirect.com

FENHEXAMID (cas 126833-17-8) (25%, SC) was sprayed on pepper fruits grown under greenhouse conditions at the recommended dose rate of 20 g/20 L water. Fruit samples were collected randomly at 0 (2 h after application), 1, 2, 4, 6, 8, 11, and 14 days post-application. The samples were extracted with acetonitrile, partitioned with water, passed through a cleanup procedure, and analysed via HPLC. Residues were confirmed via LC–tandem mass spectrometry (LC–MS/MS) in positive-ion electrospray ionisation (ESI+) mode. The rate of disappearance of fenhexamid on pepper fruits was described as first-order kinetics (r2 = 0.992) with a half-life of 4.7-day. Based on the pattern of decline of the fungicide residues in relation to the estimated maximum residue limits (MRL = 5 mg/kg), a safety pre-harvest interval of 1 day is suggested for peppers at the recommended dosage.

► It is the first report concerned with residue levels of fenhexamid in peppers. ► It gives the information on the pattern of fenhexamid disappearance in peppers. ► Fenhexamid is a safe fungicide with a pre-harvest interval of 1 day.

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