This study was carried out to investigate the residual characteristics and calculate processing factor of the environment friendly material matrine in fresh red pepper by drying. Spray solution of matrine was prepared by dilution of the commercial product (2% SL) with water at 1:1000 (v/v) ratio and sprayed once and twice at a rate of 2,000 L/ha on to red pepper plants at seven day intervals. Samples were collected at 0, 1, 3, 5 and 7 days after last application and then dried using a hot air dry oven at 60? for 36 hours until the water content was reduced to 14%. Recoveries and storage period stabilities of matrine in the samples ranged from 106.6 to 119.1% and 106.6 to 113.1%, respectively. The residual concentrations of matrine in fresh red pepper and dried red peppers treated only once were found to be from less than 0.01 to 0.11 and from 0.03 to 0.25 mg/kg, respectively. In case of twice application, the residual concentrations ranged from 0.02 to 0.12 and from 0.04 to 0.4 mg/kg, respectively. Processing factor of matrine in the fresh red pepper by drying was found to be from 1.5 to 3.3, indicating that the residual concentration of matrine in dried red pepper increased about two or three times by drying.

Residual characteristics and processing factor of the insecticidal organic material matrine in red pepper

248th National Meeting (2014)

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