质控图在乳粉中左旋肉碱检测内部质控中的应用  

Application of control chart on internal quality control in determination of L-carnitine in milk powder

作　　者：黎颖欣 陈桂云 黄铁城 陈韵 叶春常 陈梓聪 LI Ying-Xin;CHEN Gui-Yun;HUANG Tie-Cheng;CHEN Yun;YE Chun-Chang;CHEN Zi-Cong(Guangzhou Institute of Food Inspection,Guangzhou 511400,China)

机构地区：[1]广州市食品检验所,广州511400

出　　处：《食品安全质量检测学报》2020年第13期4262-4266,共5页Journal of Food Safety and Quality

摘　　要：目的建立质量控制图评估实验室对乳粉中左旋肉碱检测的受控情况。方法以有证标准物质作为控制样品,依据GB 29989-2013《食品安全国家标准婴幼儿食品和乳品中左旋肉碱的测定》检测其中左旋肉碱的含量,选取均值图和极差图用作分析。结果统计了27组乳粉中左旋肉碱的检测结果,得出乳粉中左旋肉碱的平均值为16.80 mg/100 g,标准偏差为0.96 mg/100 g,极差的平均值为0.45 mg/100 g,极差的标准偏差为0.40 mg/100 g。结论质控图表明,实验室乳粉中左旋肉碱的检测方法受控。质量控制图操作简便,有助于实验室及时发现失控情况。但实验室要注意对控制数据的长期评估,以匹配实验室当前的检测情况。Objective To establish a quality control chart to assess the controlled situation of determination of L-carnitine in milk powder.Methods The L-carnitine content of certified reference materials,which were selected as control samples,was analyzed by GB 29989-2013 National food safety standard-Determination of L-carnitine in infant and baby food and milk products.X-Chart and R-Chart were chosen for analysis.Results The detection results of L-carnitine in 27 groups of milk powder were statistically analyzed,and the mean value of L-carnitine in milk powder was 16.80 mg/100 g,the standard deviation was 0.96 mg/100 g,the mean value of the range was 0.45 mg/100 g,and the standard deviation of the range was 0.40 mg/100 g.Conclusion Control charts indicate that the determination of L-carnitine in milk powder is controlled.Quality control chart is convenient to apply and also contributes to detect uncontrolled situations.But the laboratory should pay attention to the long-term evaluation of the control data to match the current testing situation of the laboratory.

关 键 词：左旋肉碱 质控图 评价 内部质量控制 长期评估 

分 类 号：TS252.7[轻工技术与工程—农产品加工及贮藏工程]