This application note provides a method for comprehensive detection of pesticides in vegetable juice matrices using GC/MS and LC/MS methods. Methods have been developed on Agilent GC/MS and LC/MS instrument platforms that reliably detect and quantitate 39 pesticides in a vegetable juice matrix. Most of the limits of quantitation (LOQ) values for GC/MS SIM ranged from 5 to 50 ng/mL, compared with 0.25 ng/mL to 10 ng/mL for GC/MS/MS, and 0.1 ng/mL to 10 ng/mL for LC/MS/MS. Both sensitivity and selectivity are improved using MS/MS and recovery of most spiked pesticides ranged from 70 to 120%.
The document details a comprehensive analysis method for detecting pesticide residues in vegetable juice matrices. It utilizes a combination of Gas Chromatography-Mass Spectrometry (GC/MS) and Liquid Chromatography-Mass Spectrometry (LC/MS) techniques to ensure reliable detection and quantitation of 39 specific pesticides.
The study evaluates three distinct analytical platforms: single quadrupole GC/MS, triple quadrupole GC/MS/MS, and triple quadrupole LC/MS/MS. The methods employ the AOAC QuEChERS sample preparation technique and provide detailed instrument conditions, including column specifications, temperature programs, and mass spectrometry parameters for both scan and SIM/MRM modes.
The methods developed reliably detect and quantitate 39 pesticides in a vegetable juice matrix.
Sample preparation for all three instrument systems was performed using the AOAC QuEChERS method.
Using GC/MS in the SIM mode, the linear range was typically 25 ng/mL (ppb) to 1 pg/mL (ppm).