http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Leesun Kim,Hyun Ho Noh,Chang Jo Kim,RaeKeun Lee,Xiu Yuan,Min Kim,Hee Jeong Shin,Danbi Kim,Hee-Dong Lee,Kee Sung Kyung 한국농약과학회 2021 한국농약과학회 학술발표대회 논문집 Vol.2021 No.11
Traditionally in Korea, Protaetia brevitarsis seulensis (white spotted flower rainbow snail) has been used as a traditional medicine, and recently has attracted increased attention due to its antithrombotic efficacy. Spent mushroom compost is a feedstock for P. brevitarsis that may contain three fungicides, carbendazim, dimethomorph, and fenoxanil, which could be transferred to the edible insect. In this study, the analytical method for three fungicides in the edible insect was optimized using a simple extraction method combined with liquid chromatography tandem mass spectrometry. After the pulverized samples (5g) were extracted with acetonitrile (10mL) and formic acid (100 μL), fat and lipids in the samples were slowly precipitated at -20oC for 24 hours. After eight different clean-up methods were investigated, a dispersive solid-phase extraction tube containing 150 mg MgSO₄/25mg PSA/25mg C18 was selected based on optimal recovery of the target compounds. Recovery of carbendazim, dimethomorph, and fenoxanil was 77.9%-80.8% ± relative standard deviation (RSD) 0.8%-4.0%, 111.2%-116.7% ± RSD 2.8%-3.0%, and 111.9%-112.5% ± RSD 2.5%-5.2%, respectively. The simplified analytical method developed in this study can provide important data for establishing that the food meets pesticide safety standards and may be used for screening pesticides in P. brevitarsis before use in medical applications.
참외 껍질 유무에 따른 Acrinathrin, Diflubenzuron, Mandipropamid, Pyraclostrobin 잔류량 비교
김이선(Leesun Kim),박정훤(Jeong-Hwon Park),노현호(Hyun-Ho Noh),김창조(Chang-Jo Kim),김단비(Dan-Bi Kim),권혜영(Hyeyoung Kwon),진용덕(Yong-Duk Jin),노진호(Jin-Ho Ro) 한국농약과학회 2021 농약과학회지 Vol.25 No.3
For pesticide residue analysis in oriental melon, unpeeled sample is used in Korea but peeled sample is used in Japan, which can cause some difficulties in exporting melons to Japan. This study was designed to compare the amount of pesticide residue in unpeeled and peeled melon. Target pesticides, acrinathrin and diflubenzuron (insecticides) and mandipropamid and pyraclostrobin (fungicides) were applied two or three times onto the oriental melons at the interval of ten days. After the final application, the samples were collected at 0, 1, 3, 5, 7 and 14 days. Unpeeled and peeled melon samples were pulverized respectively for residue analysis. The residues in unpeeled samples were 0.02-0.28 ㎎ ㎏<SUP>-1</SUP> for acrynathrin, 0.03-0.43 ㎎ ㎏<SUP>-1</SUP> for diflubenzuron, 0.06-0.48 ㎎ ㎏<SUP>-1</SUP> for mandipropamid, and 0.03-0.32 ㎎ ㎏<SUP>-1</SUP> for pyraclostrobin. The residues of acrynathrin, diflubenzuron, mandipropamid, and pyraclostrobin in peeled samples were 0.01-0.02 ㎎ ㎏<SUP>-1</SUP>, 0.01-0.02 ㎎ ㎏<SUP>-1</SUP>, 0.01-0.04 ㎎ ㎏<SUP>-1</SUP>, and 0.01-0.02 ㎎ ㎏<SUP>-1</SUP>, respectively. The residue ratios in the unpeeled/peeled oriental melon at 0-14 DAT (days after treatment) were 3.5-28.6 for acrynathrin, 5.4-24.9 for diflubenzuron, 12.5-18.1 for mandipropamid, and 6.1-42.4 for pyraclostrobin. When the lowest residue ratio is applied to maximum residue level (MRL) guideline of Japan, MRLs of acrynathrin, diflubenzuron, madndipropamid, and pyraclostrobin residues in unpeeled oriental melon were changed into 0.07, 1.07, 0.12, and 0.31 ㎎ ㎏<SUP>-1</SUP>, respectively. When acrynathrin, diflubenzuron, mandipropamid, and pyraclostrobin residue in unpeeled oriental melon were under 0.07, 1.07, 0.12, and 0.31 ㎎ ㎏<SUP>-1</SUP>, it is possible to export the oriental melons to Japan without extra test.
LC-MS/MS를 이용한 갈색거저리 유충 중 Fenoxanil, Thiobencarb 및 Fludioxonil의 잔류분석
김이선 ( Leesun Kim ),백수진 ( Sujin Baek ),손경애 ( Kyungae Son ),노현호 ( Hyunho Noh ),문병철 ( Byeong-chul Moon ),김단비 ( Danbi Kim ),오민석 ( Min-seok Oh ),노진호 ( Jin-ho Ro ),김은선 ( Eunsun Kim ) 한국환경농학회 2020 한국환경농학회 학술대회집 Vol.2020 No.-
This study was designed to determine fenoxanil, thiobencarb, and fludioxonil residues in mealworms, the larvae of Tenebrio moliter using liquid chromatography tandem mass spectrometry. These pesticides are officially applied for wheat cultivation, so can be found in wheat bran, recommended feed for mealworms in South Korea. In this regard, effective analytical method is urgently required because mealworms are used as food or feed as alternative protein sources. Acetonitrile (10 mL) was used to extract the target pesticides. Four clean-up procedures ((1) MgSO<sub>4</sub>+25 mg PSA+25 mg C18 (2) MgSO<sub>4</sub>+50 mg PSA+50 mg C18 (3) EMR-lipid™ tube, and (4) 10 mL n-hexane) were examined. The procedure (1) successfully removed lipids and proteins derived from insects with the satisfied recoveries of the target analytes at two spiking levels of 5 ㎍/kg and 10 ㎍/kg. The recoveries were 87.6-112.9 ± RSD 4.2-4.6% for fenoxanil, 83.3-87.6 ± RSD 1.3-4.6% for thiobencarb, and 76.9~82.0 ± RSD 3.4-7.2% for fludioxonil. Method detection limit was 1.0 Mg/L. The optimized method was also applied to real samples from 30 different farms across the nation. These data can be used to set maximum residual limit for the residues in edible insects in response to positive list system. The method developed in this study is expected to be also applied to other edible insects or matrices having high fat and protein contents.
멀티콥터로 살포한 dimethomorph의 쪽파 중 잔류 및 분포 특성
김창조(Chang Jo Kim),이래근(RaeKeun Lee),신희정(Hee Jeong Shin),문병철(Byeong-chul Moon),김흥태(Heung Tae Kim),김이선(LeeSun Kim),김단비(Danbi Kim),이희동(Hee-Dong Lee),경기성(Kee Sung Kyung),노현호(Hyun Ho Noh) 한국농약과학회 2021 농약과학회지 Vol.25 No.2
This study was carried out to survey residue and distribution characteristics of dimethomorph sprayed onto tree onion at different application rate using an agricultural multicopter equipped with different nozzles (XR110015 and DG11002). To investigate time-dependent residue dissipation of dimethomorph, tree onion samples were randomly collected from 0 day to 14 days after final spraying. In order to investigate the residual distribution, tree onion samples were collected at regular distance on the day of the final spraying and the dimethomorph residues were analyzed. Residual analysis of dimethomorph was performed using QuEChERS method and LC-MS/MS. The residue analysis results obtained at each sampling time and position were statistically compared one another with Duncan’s multiple range test (p < 0.05). As the size of droplet is smaller, the total droplet deposition on target plants tends to increase. Thus, residues of dimethomorph sprayed with XR110015 nozzle tended to be higher than the residues with DG11002 nozzle. Residues of dimethomorph in tree onion has been dissipated and degraded by 95.9-98.2% from 0 day to 14 days after final spraying, pre-harvest day. In addition, the overall residues of dimethomorph in tree onion collected from all experimental plots were not uniform but below its maximum residue level. However, technologies for uniform spraying with unmanned multicopter should be developed to improve the efficacy of the pesticide.
Kim, Leesun,Lee, Jong-Hwa,Kim, Jeong-Han,Lee, Sung-Eun Korean Society of Environmental Biology 2018 환경생물 : 환경생물학회지 Vol.36 No.3
An efficient, quick and low-cost extraction and clean up method for the determination of 14 polycyclic aromatic hydrocarbons (PAHs) in the agricultural water samples was optimized using gas chromatography-tandem mass spectrometry (GC-MS/MS). The extraction of the target compounds in water sample was carried out with acetonitrile, followed by partitioning promoted by the addition of salt. As a clean-up procedure, dispersive solid phase extraction was employed to purify the analytes of interest for GC-MS/MS analysis. This method was successfully applied for the quantification of PAHs in real water samples collected for the purpose of monitoring from the waterways located in Chungbuk (15 sites) and Gyeongbuk (6 sites), S. Korea. Phenanthrene (0.54 to $2.53{\mu}gL^{-1}$) was detected in all the water samples collected from both the sites. Fluoranthene was detected in the water samples collected from the two sites in Gyeongbuk province, but other PAHs were not determined in these water sampling sites. Based on these results, the determined PAHs were conducted using an environmental risk assessment. The risk characterization ratios (RCRs) for phenanthrene ranged from 0.37 to 3.21. These RCR values referred to as risk was not controlled because RCR values of some sites were greater than 1. In conclusion, it is proposed that the optimized method in combination with GC-MS/MS could be successfully employed for the determination of PAHs in any environmental samples including water samples.
Kim, Leesun,Jeon, Jin-Woo,Lee, Yun-Se,Jeon, Hwang-Ju,Park, Byung-Jun,Lee, Hoi-Seon,Choi, Sung-Deuk,Lee, Sung-Eun The Korean Society for Applied Biological Chemistr 2016 Applied Biological Chemistry (Appl Biol Chem) Vol.59 No.4
Samples of agricultural soils possibly contaminated by polychlorinated biphenyls (PCBs) were collected from Anseong, Korea. The agricultural areas chosen have possibly been contaminated by nearby factories, either directly or via atmospheric deposition, and require monitoring. The concentrations of 29 out of 209 PCB congeners were determined at five sites using high-resolution gas chromatography/high-resolution mass spectrometry. Total concentrations of the 29 PCB congeners in soil samples obtained from each study site were 106.65, 149.15, 222.67, 166.15, and $118.28pg\;g^{-1}$ dry weight, respectively, with pentaCBs and hexaCBs giving the highest concentrations of the congeners studied. The total toxic equivalent (TEQ) for 12 PCBs from each site was 0.05, 0.11, 0.08, 0.05, and $0.04ng\;kg^{-1}$ dry weight, respectively. These values were mainly due to high TEQ values for PCB 126 (3,3',4,4',5-pentachlorobiphenyl) from each site (at 0.05, 0.10, 0.07, 0.04, and $0.03ng\;kg^{-1}$ dry weight, respectively). The TEQ values are much lower than the action level of 20 ng WHO-TEQ $kg^{-1}$ recommended by the World Health Organization, but PCB concentrations in this area should be monitored nonetheless, since these man-made compounds bioaccumulate, thus threatening the ecosystem and human health.
Leesun Kim,Yeyeon Kwak,Mi-Ja Seo,Dagyeong Jeong,In-hong Jeong 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
This study aimed to develop a new eco-friendly control method of B. tabaci using a trap plant treated with systemic insecticide. Due to high preference, tobacco plant was selected as a trap plant among solanaceous plants. Out of all 6 systemic insecticides, dinotefuran WG showed the highest mortality (> 97.3 %) against B. tabaci. The concentrations of dinotefuran in tobacco leaves after systemic treatment showed the sharp increase in the pesticide from 2 hrs until 48 hrs (2 d) and steady increase over 35 d. The mortality of B. tabaci in tobacco leaves was about 80% at 9 hrs after treatment and over 90% at 1, 2, 3, 6, 9, and 35 d after treatment. The number of B. tabaci was counted every week after dinotefuran-treated tobacco pots were placed in the tomato greenhouse cultivation. The density of the insects with 3 tobacco plants was app. 75% lower than the control (w/o tobacco plant).
Leesun Kim,Wonyoung Kim,Bueyong Park,Hong-Hyun Park,Meeja Seo,In-hong Jeong 한국농약과학회 2024 농약과학회지 Vol.28 No.2
This study characterized the efficacy of seven insecticides against Sogatella furcifera Horváth (white-backed plant hoppers, WBPHs). WBPHs are known to frequently migrate from China or adjacent East Asian countries to the Korean Peninsula during spring and summer, causing destructive damage to rice crops by sucking cell sap from their leaves while rapidly increasing in population. Adult WBPH were sampled from the Republic of Korea’s western (Wanju and Seocheon) and southern (Namhae) regions in 2020 and 2021. Collected samples were cultured for two or three generations within an insect breeding room. Of the tested insecticides, etofenprox EC , fenobucarb EC, carbosulfan SC, dinotefuran WP, and imidacloprid SC all exhibited high to moderate mortality (75-93%) of the pests at 96 hrs post insecticide treatment, while pymetrozine WP and buprofezin WP showed low mortalities (< 45%) across all sampling locations. WBPH mortality rates did not differ significantly (p>0.05) between the western) and southern regions of South Korea. The findings of this study may help manage WBPHs more effectively in areas where they pose a significant challenge.