米线中菌落总数测定结果的不确定度评估

Evaluation of uncertainty for determining the aerobic plate count in rice noodles

中文关键词:  米线  菌落总数  不确定度评估

英文关键词:rice noodles  aerobic plate count  uncertainty evaluation

中文摘要:

      目的 对米线中菌落总数测定结果的不确定度进行评估。方法 根据GB 4789.2-2016《食品安全国家标准 食品微生物学检验菌落总数测定》对米线中的菌落总数进行测定, 通过建立评估的数学模型, 分析不确定度的主要来源, 计算出不确定度的各主要分量, 得出合成不确定度和扩展不确定度。结果 在置信水平为95%时, 合成不确定度为0.23856, 扩展不确定度为0.49764。结论 影响结果不确定度的主要因素为样品的均匀性和重复测定, 该评估系统可为今后实验室测定食品中菌落总数的不确定度评估提供参考, 为检验检测结果的科学表达提供依据。

英文摘要:

      Objective To evaluate the uncertainty of the determination results of total aerobic plate count in rice noodles. Methods The aerobic plate count of rice noodles was determined according to GB 4789.2-2016 Microbiological examination in food of aerobic plate count. The combined uncertainty and expanded uncertainty were obtained through establishing the mathematic model of uncertainty evaluation, and analyzed the main sources of uncertainty and calculated the each uncertainty of the key factor during analysis process. Results As the confidence level was 95%, the combined uncertainty was 0.23856 and the expanded uncertainty was 0.49764. Conclusion The major factors affecting the uncertainty are the sample homogeneity and the repeated measurement. It provides a reference basis for the uncertainty evaluation of testing the aerobic plate count in the food and the scientific expression of results.