Application of First Order Derivative UV Spectrophotometry Coupled with H-Point Standard Addition to the Simultaneous Determination of Melamine and Dicyandiamide in Milk

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• 作者：Huayu Zou ; Kailin Xu ; Yuyan Feng ; Bing Liang
• 关键词：Melamine ; Dicyandiamide ; Milk ; Simultaneous determination ; HPSAM
• 刊名：Food Analytical Methods
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：8
• 期：3
• 页码：740-748
• 全文大小：799 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Food Science
  Chemistry
  Microbiology
  Analytical Chemistry
  
• 出版者：Springer New York
• ISSN：1936-976X

文摘

A simple and rapid method for simultaneous determination of melamine and dicyandiamide in milk was developed, in which first order derivative UV spectrophotometry was coupled with the improved H-point standard addition proposed in our previous paper for melamine and with K-ratio-H-point standard addition for dicyandiamide, respectively. Dicyandiamide and melamine did not influence with each other determination. The method was applied successfully to the determination of melamine and dicyandiamide in three kinds of milk samples, including two kinds of milk powder and one kind of liquid milk. The relative standard deviation (n--) for the determination of melamine was in the range of 4.37?～-.05?% with recoveries of 94.3?～-10.6?%, for dicyandiamide was in the range of 0.12?～-.44?% with recoveries of 94.27?～-10.6?%. The proposed method can be applied to samples containing melamine higher than 0.69?mg?kg? in milk powder and 0.15?mg?L? in liquid milk, and dicyandiamide higher than 0.011?mg?kg? in milk powder and 0.013?mg?L? in liquid milk. Furthermore, it is organic solvents-free and less laborious.