Screening Of Pesticide Residues In Fresh Vegetables On Localmarket And Supermarket In Klongluang, Pathum Thani, Thailand
Fruits and vegetables consumption isrecommended at least 400 g per day due tothey were significant sources of vitamins, minerals, dietary fiber and phytochemical. Besides their nutrient value, these products can be a source of toxic substances--pesticide residues. The toxic residues may lead to chronic toxicity; including cancers, genetic changes, blood and nerve disorders, and reproductive effects. The objective of this study was to determine the presence of pesticide residues in fresh vegetableson local markets and supermarkets in Klongluang, PathumThani. 10 types of commercially available fresh vegetables(150 samples) namely,cabbage, tomato, broccoli, coriander, spring onion, Chinese cabbage, Chinese kale, Chinese morning glory, Thai eggplant and celery, were determined pesticide residues : Organophosphorus and Carbamates group. Theywere non-quantitative determined by enzyme cholinesterase inhibition-based colorimetric technique.The remaining acetylcholine wouldthen be developed with a red-brown colorof a commercially available test kit (GT pesticide test kit®). Results showed that, 5.33% of the vegetables samples, no residues were detect, 79.34% of the samples was detected pesticide residues at low-level (≤50% inhibitory concentrations), and 15% of the samples was detected pesticide residues at high-level (>50% inhibitory concentrations), exceeding a safety threshold. The percentage ofhigh-level contaminated samples was high for three different vegetables: Chinese cabbage (33.33 %), broccoli (33.33%) and spring onion (26.33%). The findings of this study provide useful information on the current contamination status of food establishments’ area in Klongluang, Pathumthaniand also points that, the continuous monitoring and strict regulation of pesticide use on vegetables are necessary.
Keywords - pesticide residues, food safety, vegetables, Thailand,