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Effects of Lipids on Analysis of Residue Pesticides in Herbal Medicines
김장억,이성은,김장억 한국응용생명화학회 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.3
Serious problems in residue analysis of acetamipirid,chlorpyrifos, and bifenthrin caused by lipids present in herbalmedicines, platycodon root, safflower, and persicae semen havebeen found during the pesticide residue analysis using a currentlyused analytical method. Particularly, recovery tests for artificiallyspiked pesticides showed poor recoveries for bifenthrin in persicaesemen, which may be due to the low polarity of the pesticide andhigh lipid content in the matrix. An unclear layer separationbetween water and organic solvent, methylene chloride, has beenalso observed during the liquid-liquid partitioning process, whichfavors modification of the liquid-liquid partitioning by replacementwith acetonitrile and a macroporous diatomaceous earth column,respectively. The effectiveness of newly modified methods wasevaluated based on the recoveries of three pesticides in the herbalmedicines at two fortification levels (1.0 and 4.0 mg/kg). Themodified methods increased recoveries to 81.8–98.9%, suggestingthose methods could be effective and feasible alternatives todetermine acetamiprid, bifenthrin, and chlorpyrifos in lipidicsamples.
안전사용기준에 따라 살포된 살균제 Tolclofos-methyl, Azoxystrobin 및 Difenoconazole의 인삼 중 잔류량
김장억,김태화,김영환,이주희,김진수,백승경,최수연,윤영남,유용만 韓國藥用作物學會 2008 한국약용작물학회지 Vol.16 No.6
The aim of this work is to assess the safety of fungicide tolclofos-methyl, difenoconazole and azoxystrobin in ginseng sprayed by safe use guideline. When tolclofos-methyl was sprayed on ginseng by safe use guideline, the residue amounts (MRL) of it in ginseng was 0.13 mg/kg which is below than 0.3 mg/kg, maximum residue limit established by Korea Food & Drug Administration (KFDA). The residue amounts of ginseng parts, head part was 0.37 mg/kg and main body part was 0.13 mg/kg. In case of difenoconazole, the residue amounts in ginseng was 0.81 mg/kg. which was exceed the MRL, 0.2 mg/kg. By the analyze results of ginseng part, the residues of head and main body part were 3.01 and 0.40 mg/kg, respectively. In experiment of vinyl mulching, the residue amount of difenoconazole in ginseng was 0.05 mg/kg. The residue amounts of azoxystrobin in ginseng sprayed by safe use guideline was 0.14 mg/kg. This residue was not exceed the MRL 0.5 mg/kg. The residue amounts by ginseng parts was 0.51 mg/kg for head part and 0.28 mg/kg for main body part. In case of vinyl mulching, the residue amount of azoxystrobin was 0.02 mg/kg.
고감도 신속 다종농약다성분 검색/검사법 개발 연구 - LC-MS/MS법
김장억,이상협,곽세연,홍성현,조성찬,김효정 한국환경농학회 2018 한국환경농학회 학술대회집 Vol.2018 No.-
내년 1월 1일부터 시행될 농약허용물질 목록 관리 제도는 기준이 설정되지 않은 농약을 일률적으로 0.01 mg/kg으로 적용하는 것이다. 이 제도를 원활히 수행하기 위해서는 이 수준을 분석할 수 있는 국가 공정 분석법의 확립이 필요하다. 본 연구는 1차 및 2차연도에 수행한 LC-MS/MS 대상 340종중 다성분 분석에 적합하다고 판단되는264성분을 선별하여 Group 1로 지칭하였으며, 해당 성분을 다종농약다성분 분석법-제2법으로 검증하고자 한다. 시료는 오렌지를 사용하였으며, 유지 농산물 분석을 위한 탈지과정을 추가한 시험법은 대두 시료를 사용하였다. 다종농약다성분 분석법-제2법에 명시된 시료량 및 추출용매량을 조절하여 시료량 10 g 및 추출용매량 20 mL로 진행하였으며, 이에 따라 시험방법을 비율에 따라 조절하였다. 264종 농약에 대한 validation test를 실시한 결과, 분석대상농약의 정량한계는 모두 0.01 mg/kg 이하로 나타났으며, matrix-matched standard calibration의 상관계수가 오렌지의 경우 0.9901-1.000으로 나타났으며, 대두는 0.8923-0.9999로 나타났다. 다성분 분석법 기준인 70∼120%, 변이계수 22% 이하의 회수율 시험을 만족하는 농약의 수는 오렌지 250성분, 대두 245성분이었다. 표준혼합용액 조제물질 검증은 pH에 따른 저장안정성 및 저장온도에 따른 안정성을 확인하기 위하여 시험 중이다.
김장억,Kim, Jang-Eok 한국작물보호협회 2009 자연과 농업 Vol.250 No.-
이제는 농업에 대한 새로운 마인드가 필요하고 과학적으로 입증된 사실에 대하여서는 절대적으로 수용한다는 자세가 필요하다. 소비자들도 농산물 중 잔류농약의 유무가 아니라 허용기준 이상인지 아닌지를 더욱 중요하게 생각하여야 한다.
김장억,Kim, Jang-Eok 한국작물보호협회 2010 자연과 농업 Vol.259 No.-
안전농산물에는 친환경농산물, GAP농산물, 관행농산물 중 안전성이 검증된 것 모두가 포함될 수 있다. '안전농산물 무상공급'으로 하지 않는다면 어떻게 그 많은 학교에 공급되는 모든 농산물을 친환경농산물중 유기농산물로 공급을 할 수 있겠는가?
제초제 Propanil 및 그 분해산물인 DCA(3,4-dichloroaniline) 와 Humic Monomer 들과의 산화적 짝지움반응
김장억,권태동 한국농화학회 1998 Applied Biological Chemistry (Appl Biol Chem) Vol.41 No.5
The herbicide propanil and its metabolite, DCA were incubated with oxidative catalysts in the presence or absence of humic monomers to evaluate the incorporation of them into humic substances. Propanil and DCA underwent little or no transformation by oxidatve catalysts in the absence of humic monomers. In the presence of humic monomers, the most effective co-substrate for transformation of propanil was syringic acid by laccase and HRP, that of DCA was catechol by laccase and HRP, and protocatechmic acid by birnessite. The transformation of DCA was the highest when it was incubated with catechol at pH 8.0 during 24 hrs by laccase, and with catechol at pH 3.0 during 2 hrs by HRP, and with protocatechuic acid at pH 5.0 during 2 hrs by birnessite. The DCA transformation increased with increasing concentration of humic monomers. The transformation of DCA was increased with about 5 times when it was incubated with lactase and birnessite together than lactase alone, but that of it was not effected when it was incubated with HRP and birnessite together. When DCA was incubated with dissolved organic carbon in the presence of oxidative catalysts, the transformation of it was not increased by lactase and birnessite but increased by HRP.