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当前位置: 首页 > 文章 > 核磁共振脉冲宽度法测定婴幼儿乳粉中乳糖、蔗糖含量 食品工业科技 2015,36 (8) 68-71+77
Position: Home > Articles > Determination of lactose and sucrose in infant formula milk powder by PULCON ~1H-NMR method Science and Technology of Food Industry 2015,36 (8) 68-71+77

核磁共振脉冲宽度法测定婴幼儿乳粉中乳糖、蔗糖含量

作  者：
姜洁;李玮;路勇;何涛;赵雅松;宋丽萍
单  位：
北京市食品安全监控和风险评估中心
关键词：
核磁共振;脉冲宽度定量;婴幼儿乳粉;乳糖;蔗糖
摘  要：
建立了乳粉中乳糖、蔗糖的NMR脉冲宽度定量分析法。以已知浓度的顺丁烯二酸为定量外标,利用核磁信号互易原理实现对分析物的定性、定量分析。结果表明,本方法中乳糖、蔗糖在标准品与外标摩尔浓度比为0.05~5.00范围内线性良好,相关系数均大于0.999;平均加标回收率为100.19%~103.21%,相对标准偏差在1.79%~3.57%之间。与现行的国家标准婴幼儿乳粉中乳糖、蔗糖含量测定方法(GB 5413.5-2010)相比,该方法具有操作简便,取样量小,选择性好,无需标准品作参比等优点,适于乳粉样品中乳糖、蔗糖含量的快速测定。
译  名：
Determination of lactose and sucrose in infant formula milk powder by PULCON ~1H-NMR method
作  者：
JIANG Jie;LI Wei;LU Yong;HE Tao;ZHAO Ya-song;SONG Li-ping;Beijing Municipal Center for Food Safety Monitoring and Risk Assessment;
关键词：
NMR;;PULCON;;infant formula milk powder;;lactose;;sucrose
摘  要：
A proton nuclear magnetic resonance quantification called PULCON was established for determination of lactose and sucrose in infant formula milk powder. Using the known concentration of maleic acid as the external standard,the concentration of analyte in two NMR spectra could be correlated by the NMR principle of reciprocity. For the two analytes,the calibration curves established showed good linearity over the concentration range of 0.05 ~5.00(R2>0.999),and the average recoveries(n =3) were 100.19% ~103.21% with RSD of1. 79 % ~ 3. 57 %. The high universality, selectivity, non- standard and efficiency of the PULCON method demonstrated in this work suggested that this method could serve as a highly potential alternative for determination of lactose and sucrose in milk powder,compared with the current national food safety standard(GB 5413.5-2010).

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