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쪽파 재배 토양 중 Procymidone의 경시적 잔류량 변화와 흡수이행성 평가
이득영 ( Deuk-yeong Lee ),김경진 ( Kyeon-jin Kim ),문보연 ( Bo-yeon Moon ),송아름 ( A-reum Song ),최지민 ( Ji-min Choi ),손경애 ( Kyeong-ae Son ),최근형 ( Geun-hyoung Choi ),이희동 ( Hee-dong Lee ) 한국환경농학회 2022 한국환경농학회 학술대회집 Vol.2022 No.-
Dicarboximide계 살균제인 procymidone은 딸기와 오이, 고추, 토마토, 포도의 잿빛곰팡이병 방제에 사용된다. 2018년부터 2020년까지 유통 농산물 중 잔류농약 실태조사 결과 부적합 농산물 중엽경채류의 부적합률은 3배 증가하였으며, procymidone은 다빈도로 검출되어 작물 중 잔류 문제가 우려된다. 따라서, 본 연구에서는 토양에 처리한 procymidone의 경시적 잔류량 변화와 쪽파에 대한 흡수 이행성을 평가하였다. 노지에 procymidone을 토양 처리한 후 쪽파 종구를 파종하여 재배하였다. 토양 중 procymidone의 경시적 잔류량 변화를 조사하기 위해 재배 기간 중 토양을 채취하여 잔류량을 분석하였으며, 쪽파는 약제 처리 후 50일차와 71일차에 각각 수확하여 잔류량을 분석하였다. 채취한 토양과 쪽파는 QuEChERS EN법으로 추출하여 d-SPE 정제 후 각각 GC-ECD와 GC-MS/MS로 분석하였다. 토양과 쪽파 중 procymidone의 회수율은 73.8-116.1%이었고, 분석 변이 계수 (Coefficient of Variation, CV)는 1.1-6.5%이었다. Procymidone의 초기 토양 잔류량은 5.778 mg kg-1이었고, 최종 수확 시 토양 잔류량은 0.035 mg kg<sup>-1</sup>으로 초기 잔류량 대비 99% 감소하였다. 쪽파 시료 중 procymidone은 모두 LOQ 미만으로 불검출되었다. 쪽파에 대한 토양 잔류 procymidone의 흡수 이행성은 낮은 것으로 판단되었다.
이득영(Deuk-Yeong Lee),배지연(Ji-Yeon Bae),오경열(Kyeong-Yeol Oh),류성기(Sung-Ki Ryu),김영진(Yeong-Jin Kim),김진효(Jin-Hyo Kim) 한국농약과학회 2021 농약과학회지 Vol.25 No.1
The residual characteristics of boscalid, fluxapyroxad, hexaconazole, pencycuron, pyraclostrobin, and thifluzamide were investigated on a carrot. The tested granular pesticides were 0.8% boscalid, 0.4% fluxapyroxad, 2% hexaconazole, 3% pencycuron, 0.25% pyraclostrobin, and 1% thifluzamide and they were applied on 4-12 kg 10 a<SUP>-1</SUP> before seedling to soil. From the experiments, pencycuron, pyraclostrobin and thifluzamide were not detected in carrot, while the maximum residue of boscalid was detected on 0.013 mg kg<SUP>-1</SUP> in the 12 kg 10 a<SUP>-1</SUP> treatment. In addition, the maximum residues of fluxapyroxad, and hexaconazole were detected 0.016 and 0.039 mg kg1, and 0.014 and 0.030 mg kg<SUP>-1</SUP> on 6 kg 10 a<SUP>-1</SUP> and 12 kg 10 a<SUP>-1</SUP>, respectively. All the detected residues were not exceeded the currently established maximum residue limit (MRL) on carrot, thus these granular pesticides would be available for use in the prevention of sclerotinia rot in carrots without residue risk.
1-Aryl ethanolamine유도체로부터 식물 유근생장 억제제 발굴
이득영(Deuk-Yeong Lee),정미선(Mi-Sun Cheong),배지연(Ji-Yeon Bae),김진효(Jin-Hyo Kim) 한국농약과학회 2019 농약과학회지 Vol.23 No.2
Pectin methylesterase (PME) regulation has been highlighted a new mode-of-action for plant growth, and the inhibitor screening was an issue to develop a new class plant growth regulators (PGR). Recently phenylephrine had been reported their PME inhibition and PGR activity. In here, aryl ethanamines can be divided into 1-aryl-1-ethanolamine (Group I) and 2-aryl ethanamine (Group II), and the chemicals were tested PME inhibition assay. Among them, epinephrine and fenoterol showed potent PME inhibition activity and the K<SUB>i</SUB>s were 51.0 and 55.1 μM, respectively. In comparison with Group I and II, the chemicals from Group I based on 1-aryl-1-ethanolamine showed more potent PME inhibition activity than Group II. In addition, meta-hydroxylated 1-aryl-1-ethanolamines like epinephrine, fenoterol, and phenylephrine showed strong PME inhibition with the root growth inhibition in Brassica campestris (IC<SUB>50</SUB> 216 - 354 μM).
이득영 ( Deuk Yeong Lee ),오경열 ( Kyeong Yeol Oh ),김진효 ( Jin Hyo Kim ) 한국환경농학회 2020 한국환경농학회 학술대회집 Vol.2020 No.-
과불소화합물 (perfluorinated compounds, PFCs)은 1950년대부터 제지, 섬유, 전자산업 및 다양한 생활용품에 사용되고 있는 물질이다. 이들 중 perfluoroctanoic acid (PFOA), perfluorooctanoic sulfonate (PFOS) 및 각각의 유도체는 스톡홀름협약에서 잔류성유기오염물질 (persistent organic pollutants. POPs)로 지정되어 있다. 이들의 인체노출기여도는 식품을 통한 섭취가 가장 높은 것으로 보고되었다. 국내 농업환경 중 PFOA와 PFOS의 잔류는 ㎍ kg-1 이하로 보고되었으나, 농산물의 경우 오염된 토양과 물로부터 직접적인 흡수이행을 통한 오염축적 가능성이 높아 이들의 작물 흡수이행 평가가 중요하다. 본 연구에서는 상추의 연속수확에 따른 PFOA, PFOS 흡수이행을 평가하였다. 토양 1.0 용을 1% acetic acid (10 mL)로 추출한 후 4000 rpm에서 원심분리하여 상등액을 취하고, methanol/1% acetic acid (90/10, v/v)로 2회 반복하여 재추출 (10 mL<sup>x</sup>2) 한 뒤, 추출액을 15 mL까지 질소 농축하고, 증류수로 50 ml가 되도록 희석하였다. 희석액은 HLB(Hydrophilic-Lipophilic Balanced) 카트리지로 추출하였다. 추출 후 질소 농축하여 methanol로 재용해 후 EVNI-Carb™ 20 mg으로 정제하여 nylon filter로 여과하였다. 시료 정제 용액에 internal standard로 <sup>13</sup>C<sub>4</sub>-PFOA, <sup>13</sup>C<sub>4</sub>-PFOS를 넣어주고, LC-MS/MS를 이용하여 분석하였다. 상추는 무처리구, 저농도 (1.0 mg kg<sup>-1</sup>) 및 고농도 (5.0 mg kg<sup>-1</sup>) 처리구에 재배하여 1차, 2차 수확 후 분석하였다. 상추 10 g을 75% methanol (10 mL) 로 추출한 뒤 원심분리하여 상등액을 분취하고, tetrahydrofuran/water (75/25, v/v)를 이용하여 재추출 (10 mL<sup>x</sup>2) 한 뒤, 추출액을 15 mL까지 질소 농축하고, 중류수로 50 mL가 되도록 희석하여 토양과 같은 방법으로 추출 및 정제 후 LC-MS/MS를 이용하여 분석하였다. 저농도 및 고농도 처리구에서 연속수확 상추의 PFOA의 PUF (Plant uptake factor) 값은 1차 수확 시 1.026-2.235이었고, 2차 수확 시 0.882-2.891 이었다. PFOS 의 PUF값은 1차 수확 시 0.570-1.113, 2차 수확 시 0.252-1.148이었다. 저농도 및 고농도 처리구에서 연속 수확한 상추의 PFOA 및 PFOS의 PUF값은 1차와 2차 수확에서 큰 차이를 나타내지 않았다. PUF는 생물무게를 기준으로 제시하는 값으로 작물의 수분함량, 작물의 생육도에 따라 크게 달라질 수 있다. 따라서, 건물중을 기준으로 하는 생물농축계수 (Bioconcenration factor, BCF)에 대한 보완연구가 필요한 것으로 판단된다.
에테폰의 관주처리와 엽면살포에 의한 콩 잎 중 잔류 안전성
공승헌 ( Seung-heon Kong ),이득영 ( Deuk-yeong Lee ),송영훈 ( Young-hoon Song ),박기훈 ( Ki-hun Park ),서우덕 ( Woo-duck Seo ),이동열 ( Dong-yeol Lee ),김진효 ( Jin-hyo Kim ) 한국응용생명화학회 2018 Journal of Applied Biological Chemistry (J. Appl. Vol.61 No.1
Ethephon is useful pesticide as ethylene precursor, which is an efficient plant hormone to produce functional secondary metabolites. However, the residual safety of ethephon was not studied on various crops. In here, the dissipation pattern of ethephon residue in soybean leaf was investigated both on the foliar and drenching applications. The biological half-lives of ethephon residues were 26.6, and 21.1 h on the once, and double foliar applications, respectively. Although the residue after three days from the final application was up to 60.6 mg kg<sup>-1</sup>, the residue was below the limit of quantitation on the dried soybean leaf. In addition, drenching application of ethephon could increase the residue up to 36.3 mg kg<sup>-1</sup> after 20.1 h from the application, however, the treatment would not affect to the total phenol content significantly (p >0.01).
생산단계 잔류허용기준 설정을 위한 엇갈이배추 중 bistrifluron과 fluopicolide의 잔류 특성 연구
이동열(Dong Yeol Lee),정동규(Dong Kyu Jeong),최근형(Geun-Hyoung Choi),이득영(Deuk-Yeong Lee),강규영(Kyu Young Kang),김진효(Jin Hyo Kim) 한국농약과학회 2015 농약과학회지 Vol.19 No.4
This study investigated residual characteristics of bistrifluron and fluopicolide in Korean cabbage, and suggested the pre-harvest residue limits (PHRLs) based on their dissipation patterns and biological halflives. The pesticides were sprayed on Korean cabbage in two different region under greenhouse conditions at the recommended dose, respectively. The samples for residue analysis were harvested at 0 (2 hr), 1, 2, 4, 6, 8 and 10 days after treatment, and analyzed by HPLC after clean-up with Florisil SPE. The limit of quantification (LOQ) was 0.03 mg kg<SUP>−1</SUP> for bistrifluron and fluopicolide, and the recoveries ranged from 87.2-110.6% with below 5% of RSD. The biological half-lives of field I and field II were 3.9 and 4.2 days for bistrifluron and 4.9 and 4.2 days for fluopicolide, respectively. The PHRL of bistrifluron and fluopicolide were recommended as 3.83 and 3.23 mg kg<SUP>−1</SUP> for 10 days before harvest, respectively.
수도작 작물의 토양 잔류 Endosulfan 흡수 이행성
최근형(Geun-Hyoung Choi),이득영(Deuk-Yeong Lee),류송희(Song-Hee Ryu),노진호,박병준(Byung-Jun Park),문병철(Byung-Cheol Moon),김진효(Jin-Hyo Kim) 한국농약과학회 2018 농약과학회지 Vol.22 No.1
Endosulfan has not allowed to use in agriculture since 2012 in South Korea, but the residue issue in crop is not solved due to the long half-life of endosulfan in environment. In this study, the plant uptake of endosulfan was investigated from soil to rice through the calculation of bioconcentrate factor (BCF). The plant uptake experiments were designed on the two different endosulfan concentrations (3 and 10 mg kg<SUP>−1</SUP>) in the soil, and endosulfan was quantified by GC-ECD analysis. From the experiments, only endosulfan was detected in the rice straw (0.546 and 1.258 mg kg<SUP>−1</SUP> as total endosulfan in the low and the high contaminated soil), but not in brown rice. Thus, the BCF was calculated to 0.125-0.188 in rice straw, and below 0.0001 in brown rice. Additionally, endosulfan sulfate was the main contributor to total endosulfan residue in rice straw.
수확 후 에틸렌 및 광 처리에 의한 콩 잎 중 플라보노이드 함량 변화
공승헌(Seung-Heon Kong),이득영(Deuk-Yeong Lee),배지연(Ji-Yeon Bae),송영훈(Young-Hoon Song),박기훈(Ki-Hun Park),장기창(Ki-Chang Jang),김진효(Jin-Hyo Kim) 한국농약과학회 2018 농약과학회지 Vol.22 No.2
Light or ethylene treatment was reported as an efficient tool for enhancement of the secondary metabolites in crops. And isoflavone-rich soybean leaf production could be achieved by the treatment of ethephon or ethylene in pre-harvest stage. However, there was no report on the ethylene application effect on soybean leaf in post-harvest treatment. In here, the two elicitors for flavonoid production effect were investigated on soybean leaf during the post-harvest drying process. Ethylene treatment effectively induced total flavonoid contents (912–920 ㎎-QE 100 g<SUP>−1</SUP>) up to 28% in comparison with non-treatment (718 ㎎-QE 100 g<SUP>−1</SUP>). In addition, ethylene was needed for up to three hours initially at 60℃ during the drying process. On the other hand, light treatment including UV and visible lights negatively affected on the total flavonoid contents (738–792 ㎎-QE 100 g<SUP>−1</SUP>) up to 18% (p < 0.01) and the total phenol contents up to 27% (1,033–1,163 ㎎-QE 100 g<SUP>−1</SUP>).
약초 추출물과 그 분획물의 식물병원균에 대한 항진균 활성
오경열(Kyeong-Yeol Oh),정동규(Dong-Kyu Jeong),송영훈(Yeong Hun Song),이득영(Deuk-Yeong Lee),이동열(Dong-Yeol Lee),최근형,김세리,김진효(Jin-Hyo Kim) 한국농약과학회 2021 농약과학회지 Vol.25 No.4
This study was to discover the plant organic agricultural materials that can be used for disease control crops targeting phytopathogenic fungi. The antifungal activities of the ethanol extracts of 84 medicinal herbs and their fractions were screened and the antimicrobial active compounds in the extract were surveyed. The antifungal activities of the extracts were tested with the paper-disc diffusion method against R. solani, P. capsici, S. sclerotiomm, F. oxysporum and C. acutatum at 5 0 0mg L<SUP>-1</SUP>. The ethanol extracts of Acorus gramineus, Artemisia annua, Panax ginseng, Rehmannia glutinosa, Citrus unshiu, Platycodon grandiflorum, Xanthium strumarium, Morus alba, Pinus densiflora, Zingiber officinale and Atractylodes japonica inhibited over the three target fungi including R. solani, and S. sclerotiorum among them. The 11 bioactive ethanol extracts were separated with hexane, ethyl acetate and water layers by liquid-liquid partition. The organic solvent fractions of A. gramineus, P. ginseng, R. glutinosa, C. unshiu, Z. officinale and A. japonica and the aqueous fractions of A. anmua, P. grandiflorum, X. strumarium and P. densiflora showed more potent antifungal activity than the other fraction as well as the increment of the activity at the concentration of 500 mg L<SUP>-1</SUP>.