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홍경식;최경자;김흥태;황인택;조광연;김진철
- 농약과학회지
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- 제6권3호
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- pp.202-208
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- 2002
피에서 분리한 Fusarium oxysporum균주로부터 여러 번의 chromatography를 통하여 좀개구리밥의 생장을 억제하는 물질을 분리하였다. 질량분석과 핵자기공명분석을 통하여 이 물질은 dehydrofusaric acid로 동정되었다. Dehydrofusaric acid는 좀개구리밥의 생장에 대한 $EC_{50}$ 값이 $1.5{\mu}g/ml$로 매우 활성이 높은 것으로 나타났다. 또한 이 물질은 식용피, cress, 강피 및 동진벼의 뿌리의 생장도 억제하였으나, 식용피와 cress의 발아 및 네 가지 식물의 지상부의 생장에는 전혀 영향을 주지 않았다.
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Lee, Jeong-Min;Jang, Gi-Chul;Hwang, Keon-Joong
- 한국연초학회지
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- 제29권2호
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- pp.132-139
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- 2007
This study was performed to apply the more rapid and accurate sample preparation, and the high selectivity and sensitivity of the analyte detection by gas chromatography-triple quadrupole mass spectrometry (GC-MS/MS). QuEChERS (quick, easy, cheap, effective, rugged and safe) method was validated for 49 agrochemicals in the CORESTA Agrochemical Advisory Committee guide and amenable to GC-MS/MS determination. In QuEChERS method, the effects of sorbents (PSA, $C_{18}$ and GCB) and matrix of the analytes in tobacco types (flue-cured, burley and oriental) were investigated. MS/MS acquisition provided high specificity and selectivity for agrochemicals and low limit of quantification. QuEChERS by using PSA alone and the matrix-matched standards gave good recoveries and RSD values in three types of tobaccos. QuEChERS method was no needed to be complex clean-up procedure and would be used as the fast and easy method for agrochemical residue analysis in tobacco.
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