Abstract
It is possible that veterinary medicines remain in livestock food products, according to the use of many and various veterinary medicines to protect against disease when livestock animals are breed in limited space. Concentrated and continuous monitoring of residues is needed due to increases in resistance to antibiotics and side effects by eating livestock food products. We developed an analysis method for detecting streptomycin, dihydrostreptomycin, neomycin, gentamicin and spectinomycin in meat using LC/MS/MS and measured sensitivity, precision, accuracy, linearity and recovery according to CODEX guidelines to acquire confidence in the analysis method. Based on the results, we acquired good sensitivity compared to the maximum residue limit (MRL) as limits of detection (LOD) were 0.002-0.016 mg/kg and limits of quantification (LOQ) were 0.006-0.050 mg/kg. The analysis method satisfied the CODEX guidelines. The linearity ($r^2$) values of aminoglycoside antibiotics were 0.9936-0.9980, recoveries were 60-110% and relative standard deviations (RSD) were within 15%. As a result of monitoring for residues in a total 250 samples of livestock foods such as pork, chicken, and beef by the confirmed method, dihydrostreptomycin and gentamicin were detected in 5 pork samples. The residues of these antibiotics were within the MRLs. Thus, the detection ratio was 2% as 5 samples were identified from 250 samples.
본 연구에서 개발된 시험법은 고감도를 가지고 선택성이 뛰어난 LC/MS/MS를 이용함으로서 한번의 시료 전처리와 동시 분석을 통하여 아미노글리코사이드계 항생제 5종의 잔류량 분석을 가능케 하였다(15,16). 개발된 시험법은 CODEX의 가이드라인에 따라 검량선의 직선성, 회수율, 정성한계 및 정량한계, 정확성 및 정밀성 등을 고찰하여 시험법의 실효성을 검증하였다. 확립된 시험법을 이용하여 돼지고기, 닭고기, 쇠고기 등 총 250건을 분석한 결과 5건이 검출되었으며 검출율은 2%로서 검출된 양은 모두 각각의 잔류허용기준보다 낮은 수준이었으나 한 시료에서 겐타마이신과 디하이드로스트렙토마이신이 동시 검출되었다. 이 결과는 여러 종류의 항생제들을 동시에 처방하고 있다는 사실을 입증하고 있다. 그러나, 기기분석을 이용하여 아미노글리코사이드계 항생제의 잔류량 실태조사 결과 검출율 및 검출량이 낮은 안전한 수준이었다.
