고삼 추출물을 주성분으로 하는 유기농자재의 alkaloid계 살충성분 2종의 토양 및 수계 노출 안정성
Stability of Matrine and Oxymatrine from the Biopesticide from Sophora flavescens under Aquatic and Soil Environment
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BACKGROUND: The stabilities of the two alkaloidalinsecticides of S. flavescens including matrine andoxymatrine are important factor to establish expiry dateand usage manual for crop protection. However, theenvironmental stability of the compounds had not beenstudied with the extract and its commercial biopesticide. METHODS AND RESULTS: The environmentalstabilities of the two alkaloids were performed with extractof S. flavescens, and its two commercial biopesticides bothin controlled aquatic and soil conditions. The half-lives ofthe total matrines for the extract and its two commercialbiopesticides were estimated over 200 days both underaerobic and anaerobic water condition. Under dry soilcondition, the initial decay rates of the matrines werecalculated 0.0804-0.1275 (t1/2 5.4-8.6 days), and thehalf-lives under wet soil condition were calculated33.0-231 days. Total soil bacteria on the wet soil ranged6.0-8.0 log CFU/g-soil during the experiments period. CONCLUSION: The aquatic mixture of the extractshowed excellent stability both with the extract and itsbiopesticides, however, the stability of soil mixture wereshorter than the aquatic mixture, suggesting that soil metalconsider as a catalyst for the degradation of the twoalkaloids
Abstract
BACKGROUND: The stabilities of the two alkaloidalinsecticides of S. flavescens including matrine andoxymatrine are important factor to establish expiry dateand usage manual for crop protection. However, theenvironmental stability of the compounds had not beenstudied with the extract and its commercial biopesticide. METHODS AND RESULTS: The environmentalstabilities of the two alkaloids were performed with extractof S. flavescens, and its two commercial biopesticides bothin controlled aquatic and soil conditions. The half-lives ofthe total matrines for the extract and its two commercialbiopesticides were estimated over 200 days both underaerobic and anaerobic water condition. Under dry soilcondition, the initial decay rates of the matrines werecalculated 0.0804-0.1275 (t1/2 5.4-8.6 days), and thehalf-lives under wet soil condition were calculated33.0-231 days. Total soil bacteria on the wet soil ranged6.0-8.0 log CFU/g-soil during the experiments period. CONCLUSION: The aquatic mixture of the extractshowed excellent stability both with the extract and itsbiopesticides, however, the stability of soil mixture wereshorter than the aquatic mixture, suggesting that soil metalconsider as a catalyst for the degradation of the twoalkaloids
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