ABSTRACT
A multiresidue method is described for the analysis of 106 multiclass pesticides (organochlorine, organophosphate, carbamate, pyrethroid, and triazine classes) in apple juice in a single injection. The determination procedure was based on matrix solid-phase dispersion of juice on diatomaceous earth in a glass column and subsequent extraction with a mixture of hexane-dichloromethane (1 + 1) at a flow rate of 5 mL/min. The analytes were determined by capillary gas chromatography with mass spectrometric detection and confirmed by their retention times and ion ratios. The coefficients of variation for analysis of samples fortified over the range of 0.01-0.2 mg/kg were 1.62 to 18.4%, and the recoveries for all analytes were between 70 and 110%.
Subject(s)
Beverages/analysis , Malus/chemistry , Pesticide Residues/analysis , Calibration , Gas Chromatography-Mass Spectrometry , Indicators and Reagents , Reference Standards , Reproducibility of ResultsABSTRACT
Objective:To develope a method for the separation and preparation ginkgolic acid ? 1. Methods: Ginkgolic acids were extracted by alcohol, and adsorbed by silica gel to remove most of the polar impurities. It was preparated with RP HPLC. Results: The extraction ratio of ginkgolic acid ? 1 by this extraction process was above 84%, and the purity of ginkgolic acid ? 1 reached 98%. Conclusion: This procedure is simple and relatively effective.
