【摘要】 目的建立腊肠总亚硝基化合物(TNOC)测定方法,调查腊肠中TNOC污染情况。方法在以往液体标本测定方法的基础上建立腊肠TNOC的化学裂解-热能分析仪测定方法,该法具有区分热和酸不稳定物质的优点。随机采集市售腊肠32份,采用化学裂解-热能分析仪法测定腊肠中总亚硝基化合物含量。结果研究发现,AG1-X8阴离子树脂可以有效去除样品中硝酸盐的干扰,又不影响亚硝基化合物的测定;0.2%HCl/HAc既能很好裂解NaNO2,又不会使不稳定的亚硝酰胺大量分解;样品加标平均回收率为86%(83%~89%);TNOC检出限为6.6μg(N-NO)/kg,相对标准差为5.9%。32份腊肠样品中TNOC检出率为93.8%;平均含量为49.09μg/kg(95%CI39.15~126.35μg/kg)。结论该方法具有准确性和可重复性。腊肠中TNOC污染较普遍,应当加强这方面的食品卫生监督。更多还原

【Abstract】 Objective To survey the polluted level of total N-nitroso compounds(TNOC) in sausage on the market by the method established for the determination of TNOC in the sausage.Methods The method of chemical fission-thermal energy analyzer was based on the previous method for the determination of TNOC in biological fluids which could distinguish between thermo-labile compounds and acid-labile compounds (TAC). Thirty-two samples of sausage were selected by a random sample procedure on the market. Chemical fission-thermal energy analyzer was used in the analysis of TNOC in the samples.Results The results showed that nitrate from the sample was effectively removed by AG1-X8 anion exchange resin, and did not affected detection of N-nitroso compounds(NOC). 0.2% HCl/HAc was optimum concentration for TAC, and did not decompose unstable nitrosamides. Spiked with NOC mixture, the recovery in the sausage was 86%(83%-89%). The detection limit of this method was 6.6μg(N-NO)/kg with 5.9% the relative standard deviation. TNOC detection rate and the average levels in the sausage were 93.8% and 49.09μg/kg(95%CI 39.15-126.35μg/kg), respectively.Conclusion This method may be veracity and could be repeated and could use for determination of TNOC in sausage.更多还原