Food Safety: Detection of Pesticide Residues in Vegetables
HPLC-MS/MS method for multi-residue analysis of pesticides in vegetable samples for food safety compliance.
Food Safety: Detection of Pesticide Residues in Vegetables Article ID: AN-002 Category: Application Notes Subcategory: Food Safety Testing Author: Manus AI Published Date: 2026-02-03 --- Introduction The widespread use of pesticides in modern agriculture has led to concerns about their residues in food products, particularly fresh fruits and vegetables. Monitoring pesticide residues is essential to ensure food safety and protect public health. Regulatory bodies in many countries, including Pakistan and various nations in South America, have established Maximum Residue Limits (MRLs) for pesticides in food. High-Performance Liquid Chromatography (HPLC) is a key technology for the sensitive and selective detection of these residues. This application note presents a method for the simultaneous detection of three common pesticides (Carbofuran, Malathion, and Chlorpyrifos) in vegetable samples using a modified QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) sample preparation method followed by RP-HPLC with UV detection. Experimental Conditions | Parameter | Condition | | :--- | :--- | | Instrument | Standard HPLC system with UV Detector | | Column | C18, 5 µm, 4.6 x 250 mm | | Mobile Phase | Acetonitrile : Water (70:30, v/v) | | Flow Rate | 1.2 mL/min | | Column Temperature | 35 °C | | Detection Wavelength | 220 nm | | Injection Volume | 20 µL | Sample Preparation (QuEChERS Method) The QuEChERS method is a streamlined sample preparation technique that simplifies the extraction and cleanup of pesticide residues from complex food matrices. 1. Extraction 1. Homogenize 10 g of a representative vegetable sample (e.g., tomato, spinach) with 10 mL of acetonitrile in a 50 mL centrifuge tube. 2. Add the QuEChERS extraction salts (4 g MgSO₄, 1 g NaCl, 1 g sodium citrate, 0.