• Title, Summary, Keyword: pesticide residues

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Establishment of Analytical Method for Residues of Ethychlozate, a Plant Growth Regulator, in Brown Rice, Mandarin, Pepper, Potato, and Soybean Using HPLC/FLD

  • Kim, Jae-Young;Lee, Jin Hwan;Lee, Sang-Mok;Chae, Young-Sik;Rhee, Gyu-Seek;Chang, Moon-Ik
    • Korean Journal of Environmental Agriculture
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    • v.34 no.2
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    • pp.111-119
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    • 2015
  • BACKGROUND: Ethychlozate (ECZ) is a plant growth regulator of synthetic auxin for agricultural commodities (ACs). Accurate and sensitive method to determine ECZ in diverse ACs on global official purpose is required to legal residue regulation. As the current official method is confined to the limited type of crops with poor validation, this study was conducted to improve and extend the ECZ method using high-performance liquid chromatography (HPLC) in all the registered crops with method verification. METHODS AND RESULTS: ECZ and its acidic metabolite (ECZA) were both extracted from acidified samples with acetone and briefly purified by dichloromethane partition. ECZ was hydrolyzed to form ECZA and the combined ECZA was finally purified by ion-associated partition including hexane-washing. The instrumental quantitation was performed using HPLC/ FLD under ion-suppression of ECZA with no interference by sample co-extractives. The average recoveries of intra- and inter-day experiment ranged from 82.0 to 105.2% and 81.7 to 102.8%, respectively. The repeatability and reproducibility for intra- and inter-day measurements expressed as a relative standard deviation was less than 8.7% and 7.4%, respectively. CONCLUSION: Established analytical method for ECZ residue in ACs was applicable to the nation-wide pesticide residues monitoring program with the acceptable level of sensitivity, repeatability and reproducibility.

Problems in the Dietary Exposure Assessment of Pesticide Residues (식품중 잔류농약에 의한 인체피폭 평가에서의 문제점)

  • Lee, Mi-Gyung;Lee, Su-Rae
    • Korean Journal of Environmental Agriculture
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    • v.12 no.3
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    • pp.255-263
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    • 1993
  • The demand of safety assessment for pesticide residues in foods is growing in Korea. In order to assess the actual dietary exposure toward pesticide residues, the problems in utilization of pesticide residue data were reviewed and optimization of food factors applicable to Korean population was conducted. The problems and current status in setting pesticide residue tolerance-domestic and foreign-in foods were also argued. The conclusion is summarized as follows: (1) Anticipated residue estimates(ARE) calculated from field trial residue data, the percentage of crop treated, and the effects of cooking or processing should be utilized for dietary exposure assessment in a real sense. (2) Average daily intake of total foods per person in Korea was 1,104g in 1970's and 1,240g in 1980's. Much variation was observed between the two decades by food commodities. (3) Pesticide residue tolerances in Korea have been established at relatively lower levels in comparison with FAO/WHO or western countries. More extensive studies and data accumulation as related to tolerance setting are called for in future for the sake of health protection and smooth interstate trade.

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Development of Microbial Bioassay for Detection of Pesticide Residues (미생물을 이용한 농약잔류 분석법 개발)

  • 백수봉;양창술;오연선
    • Korean Journal Plant Pathology
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    • v.10 no.4
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    • pp.297-304
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    • 1994
  • This study was carried out to develop bioassay for detection of pesticide residues in agricultural products by using the soil microbial isolates sensitive to pesticides. One hundred bacterial isolates and eighty five fungal isolates were obtained from soil and their sensitivity to 10 ppm of several pesticides was examined in vitro. Five bacterial isolates and three fungal isolates were found sensitive to organochloride fungicide and two fungal isolates sensitive to organocopper fungicide. Among these isolates, B46, B93 and F67 were tested to find out the difference in sensitivity according to the methods of fungicide treatment. All of the isolates were found sensitive to 10 ppm of organochloride fungicides mixed directly in PDA. But they were found insensitive to the fungicide mixed in PDA after filtering through membrane filter. In case of organocopper fungicide, the isolates were found sensitive only when it was treated in PDA. And their sensitivity showed difference among various kinds of organochloride fungicides. B46 and B93 were employed to check the possibility as the agent for detection of the pesticidal residues in twenty eight agricultural products including rice. It was found that all samples had not residues because the samples did not inhibit the growth of isolates. When organochloride fungicides were applied to the above products, it was possible to detect the residues in fruits and vegetables at the concentration of 10 ppm, but not in starch-rich grains. B46 and B93 were identified as Bacillus sp. according to their bacterial characteristics in culture.

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Survey on Pesticide Residues in Commercial Agricultural Products in the Northern Area of Seoul (서울특별시 강북지역 유통 농산물들에 대한 농약잔류실태조사)

  • Seung, Hyun-Jung;Park, Sung-Kyu;Ha, Kwang-Tae;Kim, Ouk-Hee;Choi, Young-Hee;Kim, Si-Jung;Lee, Kyeong-Ah;Jang, Jung-Im;Jo, Han-Bin;Choi, Byung-Hyun
    • Journal of Food Hygiene and Safety
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    • v.25 no.2
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    • pp.106-117
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    • 2010
  • This study was carried out to investigate the current status of pesticide residues in 3,988 agricultural products in the northern area of Seoul from January to December in 2009. 3,988 samples comprising 109 types of agricultural products were assessed via a multiresidue method to detect 272 pesticides. Pesticide residues were detected in 25.6% (1,021 of 3,988 samples), and the rate at which the detected residues violated the maximum residue levels (MRLs) of the Korean Food Code was 2.2% (89 of 3,988 samples). The agricultural products which exceeded their maximum residue limits were leek, ginseng, welsh onion, crown daisy and lettuce (leaf). Additionally, the most frequently detected pesticide that exceeded the regulation maximum was endosulfan, procymidone, tolclofos-methyl, iprodione and flutolanil.

Development of Analytical Method for Colistin in Fish and Shrimp using Liquid Chromatography Mass Spectrometry (LC-MS/MS를 이용한 수산물 중 콜리스틴 분석법 개발)

  • Shin, Dasom;Kang, Hui-Seung;Lee, Soo-Bin;Cho, Yoon-Jae;Cheon, So-Young;Jeong, Jiyoon;Rhee, Gyu-Seek
    • Journal of Food Hygiene and Safety
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    • v.31 no.5
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    • pp.319-326
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    • 2016
  • Colistin is a last resort antimicrobial agent against multi-drug resistant Gram-negative bacteria. This study was conducted to develop an analytical method to determine colistin in fish and shrimp. The analytes were confirmed and quantified via liquid chromatography-tandem mass spectrometry (LC-MS/MS) in the positive ion mode using multiple reaction monitoring (MRM). The sample was extracted with acidified 5% methanol (containing 0.5% formic acid). Then, solid phase extraction (SPE) was used for cleanup. Matrix-matched calibration curves were linear over the calibration ranges (0.05-1.2 mg/kg) for all the analytes into blank sample with $r^2$ > 0.99. All the values fulfilled the criteria requested by the Codex guidelines. Average recoveries ranged from 85.9% to 107.9%. The repeatability of measurements, expressed as the coefficient of variation (CV, %), was less than 15%. The limit of detection (LOD) was 0.02 mg/kg, and the limit of quantitation (LOQ) was 0.05 mg/kg. This improved method showed higher accuracy and acceptable sensitivity to meet the CAC guideline requirements and is applicable for the analysis of residual colistin (A+B) in fish and shrimp.

Consumers' Recognition and Information Need About Food Safety - Focused on Pesticide Residues, Foodborne Illness, and Food Additives - (식품 안전성에 대한 소비자 인식 및 정보요구도에 관한 연구 - 잔류농약, 식중독, 식품첨가물을 중심으로 -)

  • Kim, Hyo-Chung;Kim, Mee-Ra
    • Journal of the Korean Society of Food Culture
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    • v.16 no.4
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    • pp.296-309
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    • 2001
  • This study was conducted to investigate the consumers' recognition and information need for food safety, especially focused on pesticide residues, foodborne illness, and food additives. The data were collected from 350 adults living in Taegu and Pusan by the self-administered questionnaire. Frequencies and chi-square tests were conducted by SPSS. The results of the survey were as follows: (1) the consumers' concerns about food safety were high, (2) many respondents worried about eating vegetables, fruits and grains in turn because of pesticide residues, and did not trust the results from food-safety tests, (3) the major factor for foodborne illness was regarded as unfreshed or contaminated food stuffs, (4) many consumers concerned highly about preservatives among food additives, and tried to consume food containing less food additives, and (5) many respondents wanted to get the information about harmfulness of pesticide residues in foods, method to choose fresh food, and safety of food additives.

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Safety Assessment of the Deep-fried Instant Noodles (인스탄트 유탕면의 안전성 평가)

  • 김영국;임태곤;오금순;김지인;임현철;박종태;김순천;홍석순
    • Journal of Food Hygiene and Safety
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    • v.10 no.3
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    • pp.155-161
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    • 1995
  • In the study, attempts were made to investigate the safety of the deep-fried instant noodles. A total of 50 deep-fried instant noodles were puchased from a local supermarket. Acid value , peroxide value, preservatives, heavy metals and pesticide residues were determined. Acid value(AV) and peroxide value(POV) of deep-fried instant noodles were lower than the Food Law in force. Any preservatives were not detected in all deep-fried instant noodles. The level of all heavy metals and pesticide residues found in deep-fried instant noodles were fairly low, and pesticide residues in deep-fried instant noodles was almost removed after cooking. It was conclued from these results that deep-fried instant noodles may be no harmful in oxidative stability(AV, POV) and sanitary safety(preservatives, heavy metals and pesticides).

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Procedures in Establishing Residue Limits of Pesticides on Food Crops in Codex Alimentarius Commission and Foreign Countries (국제기구 및 외국에서 농산물중 농약잔류 허용기준의 설정절차)

  • Lee, Mi-Gyung;Hong, Moo-Gi;Park, Kun-Sang;Choi, Dong-Mi;Lim, Moo-Hyuk;Lee, Su-Rae
    • Korean Journal of Environmental Agriculture
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    • v.24 no.1
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    • pp.45-55
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    • 2005
  • This study was undertaken to find out necessary measures to improve the tolerance setting system of pesticide residues on food crops in Korea which is scientifically reasonable and harmonizable with international standards. Information on tolerance setting systems of pesticide residues by Codex Alimentarius Commission, Joint FAO/WHO Meeting of Experts on Pesticide Residues, USA, EU, Japan and Taiwan was collected and analyzed. On the basis of information in the above countries, necessary actions to be taken by the Korean regulatory authorities were recommended with respect to priority setting, maximum residue limits (MRLs) setting based on field residue data, group MRLs, minor crop problems, quantitation limit and dietary intake assessment.

Evaluation of Results in Pesticide Residues on Incongruity Commercial Agricultural Commodities using Network Analysis Method (네트워크 분석을 활용한 유통농산물 잔류농약 부적합 현황 분석)

  • Park, Jae Woo;Seo, Jun Ho;Lee, Dong Hun;Na, Kang In;Cho, Sung Yong;Bae, Man Jae
    • Journal of Food Hygiene and Safety
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    • v.33 no.1
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    • pp.23-30
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    • 2018
  • The purpose of this research was to introduce network analysis method for analyzing pesticide residues in incongruity commercial agricultural commodities. Based on the "results in pesticide residues on incongruity commercial agricultural commodities" on "Guidelines for food safety management 2017", we used centrality analysis for pesticide residues via degree, closeness and betweenness centrality measurement. In case of degree centrality result, chlorpyrifos and diazinon were the most highly "connected node" in pesticide network. For the closeness centrality result, the most pesticides showed the similar closeness trend except for 19 species of pesticides. Fludioxonil and chlorpyrifos are recognized as the "bridge" of pesticides network with their high betweenness centrality. The results of network analysis show the "relation" data, which could not represent through out the conventional statistical analysis, among the pesticide residues. We hope that the network analysis method will be appropriate and precise tool for analyzing pesticide residues via elaboration and optimization.