Author(s): ZHANG Ya-qiong, LUO Jin-feng, WANG Lei, DING Xiao-wen, DENG Xin-ping, College of Food Science, Southwest University, Agricultural Products Processing Laboratory of Chongqing, College of Plant Protection, Southwest University
Pages: 110-114
Year: 2013 Issue:  17
Journal: Science and Technology of Food Industry
Keyword:  pesticide residues; detergent; vegetable; elution rate;
Abstract: In order to make out a simple and feasible way to remove residual pesticide in vegetable,the effects of different washing detergents on levels of five pesticide residues and vitamin C damage rate in vegetables were studied in the simulation system.By washing five kinds of pesticides in romaine lettuce and spinach with tap water,2% salt water and 2% NaHCO 3 aqueous solution respectively,the pesticide residues content in vegetables was measured by gas chromatography and the vitamin C content was measured by ultraviolet spectrophotometry.The results showed that the average elution rates of avermectin by tap water,2% salt water and 2% NaHCO 3 aqueous solution were 26%,51% and 42% respectively.The average elution rates of chlorothalonil by tap water,2% salt water and 2% NaHCO 3 aqueous solution were 54%,68% and 64% respectively.The average removal rates of trichlorfon were 13%,23% and 25% respectively.The average elution rates of chlorpyrifos were 26%,35% and 43% respectively.The average elution rates of beta-cypemethrin were 15%,24% and 29% respectively.The average damage rate of vitamin C were 15%,19% and 20% respectively.The effects of salt water and NaHCO 3 aqueous solution were better than tap water alone and the damage rate of vitamin C were low.So salt and NaHCO 3 these two detergents could be used as effective methods to remove the pesticide residues in leafy vegetables in daily life.