Subcritical Fluid Extraction for Efficient Removal of Pesticide Residues from Lycium barbarum
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Abstract:
To effectively remove the pesticide residues in Lycium barbarum and improve food safety, in this study, subcritical fluid extraction technology was used to remove 7 kinds of common pesticide residues such as chlorpyrifos, cypermethrin and carbendazim. The effects of different solvent types, extraction temperature, extraction time and times on the removal rate of the pesticides were investigated. The research revealed that the optimal extraction conditions for subcritical fluid removal of pesticide residues were as follows: extracting agent, butane: methanol, 2:1 (W/W); extraction temperature, 30 ℃; extraction duration, 40 min; extraction times, 2. Under these conditions, the removal rates of carbocarb, cyhalothrin, cypermethrin and chlorpyrifos were 95.53%, 92.73%, 93.58% and 93.41%, respectively, with the removal rates of imidacloprid, carbendazim and fipronil as 86.61%, 89.04% and 89.59%, respectively. After the treatment, the loss rates of polysaccharide, betaine and water of Lycium barbarum were 4.50%, 4.41% and 0.54%, respectively, indicating that the loss of active components was small. The subcritical fluid extraction technology can reduce the pesticide residues in Lycium barbarum not only significantly but also non-destructively. It is a green and environmentally friendly method for the removal of pesticide residues.
