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- 저자 : 박인주 ( Inju Park ) (검색결과 4 건)
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이유선 ( Yu Seon Lee ),박인주 ( Inju Park ),신서영 ( Seoyoung Shin ),최근화 ( Keunhwa Choi ),유지현 ( Ji Hyun Yoo ),이정미 ( Jung Mi Lee ),장귀현 ( Gui-hyun Jang ),문귀임 ( Gui Im Moon ),허수정 ( Soojung Hu ),전대훈 ( Daehoon Jeon 한국환경농학회 2022 한국환경농학회 학술대회집 Vol.2022 No.-
As a herbicide that controls cell division by interfering with the synthesis step of very long-chain fatty acids constituting the cell wall, Pethoxamid is used before or just after germination of crops such as rice and corn. It has a short half-life and low resistance, so it is very effective in removing a wide range of weeds. In this study, an analytical method for the determination of Pethoxamid in foods and agricultural products was developed as Ministry of Food and Drug Safety(MFDS) method. We used five agricultural products(mandarine, potato, soybean, hulled rice, and chilli pepper) as group representative to verify for this study. The sample preparation process was conducted in two steps with QuEChERs(quick, easy, cheap, effective, rugged, and safe) method for making the extraction and purification process efficient. First, in order to extract the samples, 0.1% formic acid in acetonitrile was added and shaken for 10 minutes. Next, magnesium sulfate anhydrous and sodium acetate were added, followed by centrifugation(4,700 G, 10 minutes). Thereafter, to remove the interferences in samples, dispersive solid-phase extraction(d-SPE) using C18, magnesium sulfate anhydrous, PSA and GCB was performed for 10 minutes before LC-MS/MS(Liquid Chromatography-Tandem Mass Spectrometry) analysis with C18 column. The linear standard calibration curves were confirmed showing r-square values higher than 0.99(coefficient of determination with calibration range). Mean average accuracies of Pethoxamid were shown 78.8∼95.2%. The precision were also shown less than 7.5% for all five samples. These results are suitable for CODEX guideline for residue analysis(CAC/GL 40). In summary, the proposed method for determination of Pethoxamid residue in foods could be included in the Korean Food Code for enabling the safety management of pesticides.
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신서영 ( Seoyoung Shin ),박인주 ( Inju Park ),이정미 ( Jung Mi Lee ),장귀현 ( Gui-hyun Jang ),김현경 ( Hyun-kyung Kim ),허수정 ( Soojung Hu ),남봉현 ( Bonghyeon Nam ) 한국환경농학회 2023 한국환경농학회 학술대회집 Vol.2023 No.0
Nereistoxin is a natural toxin found in lugworms. Bensultap, cartap, thiocyclam and thiosultap, which are insecticides derived from the molecular structure of nereistoxin, are rapidly converted into nereistoxin in vivo and in the environment after spraying the drug, which binds to nicotinic acetycholine receptor of insects. It shows an insecticidal activity by inhibition of the Na+ and K+ conduction at the end plate membrane, which causes paralysis of central nervous system of insects. In Korea, the definition of residues of bensultap, cartap and thiocyclam is managed as nereistoxin. Currently, the analytical method of nereistoxin residue has a complicated and time-consuming process. Therefore, we tried to improve the usability and efficiency with the QuEChERS (quick, easy, cheap, effective, rugged, and safe) method so that it can be safely converted to nereistoxin. In this study, the validation for the quantitative analysis of nereistoxin was performed, which was verified by the Ministry of Food and Drug Safety. Five agricultural products (mandarin, potato, soybean, hulled rice, and chili pepper) showing group representatives were chosen for experiments. In order to extract, L-cysteine was added into the samples and mixed thoroughly. The samples were heated at 70℃ with 3% nickel chloride and 28% ammonium hydroxide to convert into the nereistoxin rapidly. After addition of sodium chloride and acetonitrile, centrifugation was performed followed by purification using dispersive solid-phase extraction (d-SPE) with anhydrous magnesium sulfate and primary and secondary amine (PSA) to remove the interferences in samples. The results of LC-MS/MS analysis using amide column show the linear standard calibration curves with r-square values higher than 0.99 (coefficient of determination with calibration range) and mean recovery rates of nereistoxin ranged at 84.4~106.2%, the precision less than 12.6% in all five samples. These results are suitable for CODEX guideline for residue analysis (CAC/GL 40). In summary, the proposed method for determination of nereistoxin residue in foods could be included in the Korean Food Code for enabling the safety management of pesticides.
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변규덕(Kyu Deok Byeon),김가영(Ga Young Kim),이인주(Inju Lee),이새로미(Saeromi Lee),박재로(Jaeroh Park),황태문(Taemun Hwang),주진철(Jin Chul Joo) 대한환경공학회 2016 대한환경공학회지 Vol.38 No.7
실제 하천과 호소에서 적용된 상용화된 28개 조류저감기술의 현장적용 자료를 조사하고, 이를 평가(evaluation)․분석(analysis)하여 분류(classification)하였다. 분류 기준은 공법구분, 적용 수체의 유속, 적용 시점의 3가지 기준에 의해 분류하였으며, 각 조류저감기술은 경제성, 현장 적용성, 효과 지속성, 수생태 안전성을 기준으로 평가를 실시하였다. 공법 원리별로 분류 시 물리적 공법이 32.2%, 화학적 공법이 25%, 생물학적 공법이 21.4%, 복합처리 공법이 21.4%를 차지하였다. 조사된 조류저감기술의 75%는 유속 0.2 m/s 이하의 정체된 호소, 저수지, 소형 하천을 대상으로 적용되었다. 가압부상장치와 컨베이어 벨트 및 탈수장치를 탑재한 이동식 녹조제거선과 광물기반 천연 부유응집제 기술이 타 기술 대비 현장 적용성은 우수한 것으로 조사되었다. 발생현장에 적합한(site-specific) 맞춤형 조류저감기술의 도입은 pilot 규모의 장ㆍ단기 운전을 통해 효율을 검증 후 최종 도입하는 것이 바람직하다. 또한, 회수된 조류 바이오매스를 생물 자원화를 통해 에너지 회수형 조류저감기술 등의 신속한 개발 및 보급이 필요하다. Commercial 28 algae removal technologies that have been applied in domestic rivers and lakes with green tide were investigated, analyzed and classified. The classification of algae removal technologies was based on the three criteria (i.e., principle, flow rate of water body, and application period). Also, algae removal technologies were evaluated in terms of cost effectiveness, field applicability, effect durability, and eco friendliness. From the analysis results, technologies using physical, chemical, biological, and convergent controls were 32.2%, 25%, 21.4%, and 21.4%, respectively. The 75% of technologies have been applied to stagnant water body (≤0.2 m/s). Also, algae harvesting ship with dissolved air flotation, conveyor belt and filtration processes and natural floating coagulant were found to have better field applicability, compared to other technologies. However, proper algae removal technology in specific rivers and lakes should be chosen after the evaluation of long-term pilot scale field test. Also, development of energy and resource recovery technologies from algae biomass is warranted.
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