Multi-residue analysis of four aminoglycoside antibiotic pesticides in plant agricultural products

Simplified and effective pretreatment methods combined with high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) for the determination of four aminoglycoside antibiotic pesticides kasugamycin, validamycin, streptomycin sulfate and zhongshengmycin in high starchy content matrix (rice), high water and high acidic content matrix (citrus) and high water content matrix (melon) were established. Single-factor and central composite design (CCD) experiments were employed to optimize the pretreatment conditions, resulting in the optimal factor combinations and achieving scientifically accurate outcomes. Validation results proved satisfactory, with all four target compounds exhibiting correlation coefficients (r) exceeding 0.99 within the linear range in three matrices. The recoveries were 81.5-102.2 %, and both inter-day and intra-day relative standard deviations (RSDs) were below 10.7 %. The limits of detection (LODs) were 0.1-4.0 μg/kg, with limits of quantitation (LOQs) consistently at 50 μg/kg. Furthermore, the methods were applied to potato, grape, and cucumber matrices to further validate their applicability.