能力验证乳粉中乳酸菌计数不确定度的评定.PDF

7 7 Vol. 7 No. 7 2016 7 Journal of Food Safety and Quality Jul. , 2016 杨 燕, 李琼琼, 宋光艳, 戴佳丽, 杨美成* ( , 201203) 摘 要: 目的 方法 GB4789.35-2010, JJF 1059.1-2012 结果 , , 6 0.020120.043370.019920.032960.02182 0.031379 (P=95%, k=2.09) 结论 关键词: ; ; Uncertainty evaluation of lactic acid bacteria count in milk power by proficiency testing * YANG Yan, LI Qiong-Qiong, SONG Guang-Yan, DAI Jia-Li, YANG Mei-Cheng (Shanghai Institute for Food and Drug Control, Shanghai 201203, China) ABSTRACT: Objective To evaluate the uncertainty of lactic acid bacteria count in milk power by proficiency testing. Methods Proficiency testing of lactic acid bacteria count was conducted under the direction of Reference book for microbiological ability verification plan in food and GB 4789.35-2010 National food safety standard Food microbiological examination: Lactic acid bacteria. Then, the uncertainty sources introduced in the experiment were determined according to JJF1059.1-2012 Evaluation and expression of uncertainty in measurements . Results The dispersion was the major contribution of the uncertainty in the detection of total bacterial colony, so the dispersion of results was evaluated for the uncertainty of determination results. The extended uncertainty results of 6 samples were 0.02012, 0.04337, 0.01992, 0.03296, 0.02182 and 0.0313