Abstract
The aim of this work is to investigate the presence of methomyl pesticide residue and the rate of disappearance in mint cultivated in the aquaponics system based on the application of UPLC-MS to establish a safety time interval before crop harvesting. Results showed that an effective and sensitive method based on UPLC-MS has been used for the determination of methomyl pesticide residues in mint. The initial residue level was much higher in roots (79.52 μg/kg), and it can be decreased to 16.73 (after 15 days) μg/kg and 3.31 (20 days) μg/kg, while the least was detected on the mix leaves and stems (44.54 μg/kg), and it can be decreased to 15.35 (after 20 days). In our case, we suggest that a safety interval in the range of 15–20 days should be allowed after the detection of methomyl in water, and the concentration of methomyl was lower than the acceptable daily intake (ADI) of the China Food and Drug Administration (CFDA) (20 μg/kg).
Highlights
Mint (Mentha haplocalyx) or bohe in Chinese is an herbaceous plant that originates from the Mediterranean region and is cultivated worldwide
To the best of our knowledge, only one scientific report has been reported on the presence of methomyl pesticide residue and rate of disappearance in peppermint after foliar application [9]. e aim of this work is to investigate the presence of methomyl pesticide residue and the rate of disappearance in mint cultivated in the aquaponics system based on the application of ultrahigh-performance liquid chromatography (UPLC)-MS to establish a safety time interval before crop harvesting
Methomyl residues in mint cultured in the aquaponic system with a known concentration (200 μg/L) of the target pesticides in water were investigated
Summary
Mint (Mentha haplocalyx) or bohe in Chinese is an herbaceous plant that originates from the Mediterranean region and is cultivated worldwide. Pesticide residue analysis can be considered as a difficult task since large amount of chlorophylls, oil, and other colored compounds are contained in mint. SPE was the one that has been commonly applied for pesticide residue analysis. Several methods have been reported to determine methomyl and other pesticides residue in mint using gas chromatography [9, 10], liquid chromatography [11], gasliquid chromatography [12], high-performance liquid chromatography (HPLC), high-performance liquid chromatography-mass spectrometry (HPLC-MS), and HPLCMS/MS. Ultrahigh-performance liquid chromatography (UPLC) presents an interesting alternative for methomyl pesticide residue determination in traditional Chinese medical herbs [6, 13], a method which is an advanced form of HPLC with improved solution, enhanced sensitivity, and shorter retention times [14]
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