A total of 100 commercially available olive oil products were analyzed for 179 pesticide residues using gas chromatography-tandem mass spectrometry (GC/MS/MS). The olive oil samples were mixed with organic solvents, centrifuged and frozen to remove fat, and pesticide residues were analyzed using the “quick, easy, cheap, effective, rugged, and safe” (QuEChERS) method. The determination coefficient (R2) of the analysis method used in this study was ≥0.998. The detection limit of the method ranged 0.004–0.006 mg/kg and its quantitative limit ranged 0.012–0.017 mg/kg. The recovery rate (n=5) measured at the level ranging 0.01–0.02, 0.1, and 0.5 mg/kg ranged 66.8– 119.5%. The relative standard deviation (RSD) was determined to be ≤5.7%, confirming that this method was suitable for the "Guidelines for Standard Procedures for Preparing Food Test Methods". The results showed that a total of 151 pesticides (including difenoconazole, deltamethrin, oxyfluorfen, kresoxim-methyl, phosmet, pyrimethanil, tebuconazole, and trifloxystrobin) were detected in 64 of the 100 olive oil products. The detection range of these pesticide residues was 0.01–0.30 mg/kg. The percentage acceptable daily intake (%ADI) of the pesticides calculated using ADI and estimated daily intake (EDI) was 0.0001–0.1346, indicating that the detected pesticides were present at safe levels. This study provides basic data for securing the safety of olive oil products by monitoring pesticide residues in commercially available oilve oil products. Collectively, the analysis method used in this study can be used as a method to analyze residual pesticides in edible oils.

ABSTRACT
Materials and Methods
    시료
    식중독 원인균 분석
    식중독 원인균 독소 유전자 분석
    위생지표균 분석
    보관방법에 따른 일반세균의 정량 및 통계 분석
Results and Discussion
    식중독균 오염도 현황
    B. cereus와 C. perfringens의 독소 유전자 분포
    위생지표균 오염도 현황
    보관방법에 따른 일반세균수 변화
국문요약
Conflict of interests
ORCID
References

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• 김재관(경기도보건환경연구원 농수산물검사부 안산농수산물검사소) | Jae-Kwan Kim (Ansan Agricultural and Fishery Products Inspection Center, Gyeonggi province Institute of Health and Environment, Ansan, Korea)
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• 김지은(경기도보건환경연구원 농수산물검사부 안산농수산물검사소) | Ji-Eun Kim (Ansan Agricultural and Fishery Products Inspection Center, Gyeonggi province Institute of Health and Environment, Ansan, Korea)
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• 이성남(경기도보건환경연구원 농수산물검사부 안산농수산물검사소) | Seong-Nam Lee (Ansan Agricultural and Fishery Products Inspection Center, Gyeonggi province Institute of Health and Environment, Ansan, Korea)
• 박명기(경기도보건환경연구원 농수산물검사부 안산농수산물검사소) | Myoung-Ki Park (Ansan Agricultural and Fishery Products Inspection Center, Gyeonggi province Institute of Health and Environment, Ansan, Korea)
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