婴幼儿配方乳粉中脂肪酸测定不同定量方法的差异性.pdfVIP

中国乳品工业 zgrpgy@163.com 4怦，q!ry卢y汀INDUSTRY ~ 婴幼儿配方乳粉中脂肪酸测定不同定量方法的差异性 刘秀滴 (黑龙江省食品药品检验检测所，哈尔滨 150088) 摘 要:婴幼儿配方乳粉中不同脂肪酸组分定量方法在相关标准中主要有外标法与归一化法标法。通过对两种定量方法的比较研 究，发现两者存在显著误差，究其原因:脂肪中各脂肪酸质量分数差异较大及分别进行外标法定量时计算所得的总脂肪酸质量分数因 累计误差而导致偏低等原因，使得计算所得的各脂肪酸纽分显著高于实际质量分数。经研究证明:两种方法脂肪酸组分测定结果外 标法较归一化法偏高(约20% - 30%); 。而归一化法计算的为相对质量分数，其测定误差远低于外标法，更接近其实际质量分数。建 议采用归一化法定量测定脂肪酸组分更为准确合理。 关键词:气相色谱;婴幼儿配方乳粉;脂肪酸组分;定量方法 中圄分类号:TS252.7 文献标识码:A 文章编号:1001-2230(2016)08-0052-03 Research on the differences between the different quantitative methods for the determination of fatty acid in infant formula powder LIU Xiu-qing (Heilongjiang Institute for Food and Drug Control Harbin 150088,China) Abstract: Infant formula milk powder in different fatty acid group ìs divided into quantitative methods ìn the relevant standards 缸e maìnly extemal standard method and normalìzation method standard method. Through a comparatìve study of two kinds of quantitative methods and found two significant eηor. The reason: fat in the fatty acid mass fraction among the larger and were carried out stan也rd quantitative method when the calculated total fa忧y acìd mass 丘action due to accumulated error and result in partial low, the calculated of the fa忧yacìd group was sìgnìficandy higher than that of the actual mass 丘action. Studies prove that: 饥110 methods in the fatty acid composìtion ofpoints de- terrnìnation res吐也 of extemal standard method wìth normalìzation method is high (必out 20% - 30%). And normalìzation method is the rela- tive mass fraction , and the measurement error were lower than the outsìde standard method , closer to the actual qualìty scores. Suggest using normalìzation method for quantitative deterrnìnation of fatty acìd composìtion ìs more accurate and reasonable. Key words: GC; Infan