包装食品中胆固醇的实验室分析及其误差的研究-中国食品卫生杂志.PDFVIP

包装食品中胆固醇的实验室分析及其误差的研究 ———何 　梅 　满青青 　梁晓聪等 — 9 — 论著 包装食品中胆固醇的实验室分析及其误差的研究 1 1 2 1 1 何 　梅 　满青青 　梁晓聪 　何学军 　杨月欣 ( 1 中国疾病预防控制中心营养与食品安全所 ,北京 　100050 ; 2 陕西省疾病预防控制中心 ,陕西 　西安 　710051) 摘 　要 : 目的　研究我国实验室对包装食品中胆固醇检测的实验误差 。方法 　根据 2000 年全国包装食品消费的 ( ) 调查 ,选择 2 类 肉类 、奶制品类 4 种包装食品 ,在全国的7 家实验室进行 3 次胆固醇的平行样检测 ,胆固醇检测方 法为国家标准方法 。结果 　所有胆固醇检测结果筛查均合格 。胆固醇检测精密度为 :实验室内相对标准差 593 % ～910 % ,实验室间 1679 %～3472 % ,室内和室间总和为 1791 %～3527 % ,平均 2578 % 。胆固醇检测的相对扩 展不确定度为 3564 %～6362 % ,平均 4773 % 。结论 　我国实验室对胆固醇的检测误差在 35 % 以内,95 %不确定 度在 65 %以内。 关键词 :胆固醇 ; 选择偏倚 ; 食品标签 ; 质量控制 Laboratory Analysis and Its Error for Cholesterol in Prepackaged Foods HE Mei , MAN Qingqing , L IAN G Xiaocong , HE Xuej un , YAN G Yuexin (National Institute for Nutrition and Food Satety , Chinese CDC , Beij ing 100050 , China) Abstract : Objective 　To observe the experimental error of cholesterol analysis in prepackaged food from different labs of China . Method 　According to national prepackaged foods consumption survey results in 2000 , 4 prepackaged foods were selected as samples and divided into meat products and dairy products. The cholesterols of samples were analyzed in parallel for three times with national standard methods in seven labs from all the country. Results 　100 % results were up to grade by Grubbs , Cochran and Dixon screening methods. The accuracy of cholesterol analysis was expressed by RSD . The RSD of inner labs and inter labs were from 593 % to 910 % and from 1679 % to 3472 %. The RSD of sum of inner labs and inter labs was from 1791 % to 3527 % , and the RSD of average of inner labs and i