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Stability of Four Limonoidal Substances of Neem Extract under Controlled Aquatic and Soil Conditions

님나무 추출물의 Limonoid계 살충성분 4종의 환경매체 노출 안정성

  • Kim, Jin Hyo (Chemical Safety Division, National Academy of Agricultural Science, RDA) ;
  • Jeong, Du-Yun (Chemical Safety Division, National Academy of Agricultural Science, RDA) ;
  • Jin, Cho-Long (Chemical Safety Division, National Academy of Agricultural Science, RDA) ;
  • Kim, Won-Il (Microbial Safety Team, National Academy of Agricultural Science, RDA) ;
  • Lim, Sung-Jin (Chemical Safety Division, National Academy of Agricultural Science, RDA) ;
  • Choi, Geun-Hyoung (Chemical Safety Division, National Academy of Agricultural Science, RDA) ;
  • Park, Byung-Jun (Chemical Safety Division, National Academy of Agricultural Science, RDA)
  • 김진효 (농촌진흥청 국립농업과학원 화학물질안전과) ;
  • 정두연 (농촌진흥청 국립농업과학원 화학물질안전과) ;
  • 진초롱 (농촌진흥청 국립농업과학원 화학물질안전과) ;
  • 김원일 (농촌진흥청 국립농업과학원 유해생물팀) ;
  • 임성진 (농촌진흥청 국립농업과학원 화학물질안전과) ;
  • 최근형 (농촌진흥청 국립농업과학원 화학물질안전과) ;
  • 박병준 (농촌진흥청 국립농업과학원 화학물질안전과)
  • Received : 2014.03.18
  • Accepted : 2014.07.09
  • Published : 2014.09.30

Abstract

The stabilities of four limonoidal substances including azadirachtin A, azadirachtin B, deacetylsalannin and salannin were investigated both in controlled aquatic and soil conditions. The half-life of the total limonoid for neem extracts and its two commercial biopesticides was estimated 86.6-173 days in water under air, while degradation of the compounds was detected below 10% after eight weeks in deoxygenated water. The half-life in dry soil was estimated 43.3-57.7 days, and there was a similar degradation pattern with in aerobic water condition. In case of wet soil condition, the total bacteria of the soils ranged 6-8 log CFU/g soil for during the experiment, and the half-life of the total limonoid was 6.4-12.3 days. From the result, the fast limonoid degradation in wet soil environment was the result of both chemical oxidation and microbial degradation.

Acknowledgement

Supported by : 국립농업과학원

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