摘要
采用非线性化学指纹图谱技术,及最小二乘一元线性回归方法对婴幼儿羊奶粉中掺假牛奶粉进行定量分析。首先测定具有不同掺杂百分比的混合奶粉标样非线性化学指纹图谱,利用其停波时间相对于掺杂牛奶粉含量之间的一元线性关系,通过最小二乘法建立测定混合奶粉中掺杂牛奶粉含量的校正模型;然后用该模型和混合奶粉试样指纹图谱的停波时间来计算混合奶粉中掺杂牛奶粉的含量;最后根据掺杂牛奶粉的含量来鉴别和定量评价奶粉质量。实验表明：该方法相关系数为0.9945,相对标准偏差（RSD）为0.53%~2.18%,回收率在95.3%~107.0%范围,检出限为1.09%。方法准确度高,重现性好,操作简单,是一种切实可行的测定婴幼儿羊奶粉中掺杂牛奶粉含量的方法。
The adulteration of infant formula milk powder in infant formula goat milk powder was rapidly determined by the nonlinear chemical fingerprint method with least square method.Firstly,the nonlinear chemical fingerprints of standard samples with different content of infant formula milk powder in infant formula goat milk powder were obtained,and a linear calibration model was established for a linear relationship between the stop wave time and the content of infant formula milk powder by the least square method.Then,the content of infant formula milk powder in mixed milk powder was calculated by using the calibration model.Lastly,according to the content of infant formula milk powder in mixed milk powder,the authenticity and quality of the sample may be accurately identified and quantitatively evaluated.The results showed,the correlation coefficient was 0.9945,the RSDs were 0.53%-2.18%,the recoveries were 95.3%-107.0%,and the detection limit was 1.09%.The method had good accuracy,reproducibility with simple operation,and could be a practical and feasible approach for determining the adulteration of infant formula milk powder in infant formula goat milk powder.
出处
《分析科学学报》
CAS
CSCD
北大核心
2016年第1期43-47,共5页
Journal of Analytical Science
基金
陕西省科技统筹创新工程计划(No.2011KTCQ03-08)
"十二五"农村领域国家科技计划课题(No.2012BAD12B07)
陕西省教育厅服务地方专项(No.15JF009)
西安市科技局技术转移示范工程项目(No.CXY1513(7))
关键词
非线性化学指纹图谱
羊奶粉
牛奶粉
定量评价
Nonlinear chemical fingerprint
Goat milk powder
Milk powder
Quantitative evaluation
