光谱学与光谱分析, 2011, 31 (9): 2383, 网络出版: 2011-11-09
基于中红外光谱检测牛奶中掺杂的尿素
Adulteration Detection of Urea in Milk by Mid-Infrared Spectroscopy
摘要
采用中红外光谱技术对牛奶中掺杂尿素目标物进行检测。 配置含有尿素浓度范围为1~18 g·L-1之间18个牛奶样品, 分别研究了纯牛奶和掺杂尿素牛奶的红外光谱特性, 并进行了对比分析。 利用尿素1 562 cm-1处酰胺Ⅲ带CO伸缩振动吸收峰面积A1 562与1 464 cm-1处C—N伸缩振动吸收峰面积A1 464的比值A1 562/A1 464对牛奶中尿素浓度进行线性拟合, 研究结果表明A1 562/A1 464与牛奶中含有尿素浓度具有一定的线性关系, 其相关系数达到0.96以上。 该研究对提高乳制品的质量, 保护消费者利益具有重要的社会意义和应用前景。
Abstract
In the present study, a technique of mid-infrared spectroscopy for detection of urea in milk was put forward. Eighteen adulterated milk samples with added different content of urea (1~18 g·L-1) were prepared. The mid-infrared spectra of these milk samples were measured. The infrared characteristics of pure milk and adulterated milk were studied, and analysis and comparisons of the differences were carried out. The absorption peak area (A1 562) of 1 562 cm-1, which was assigned to the C—N stretching vibration for urea, and the absorption peak area (A1 464) of 1 464 cm-1, which was assigned to the CO stretching vibration for amide Ⅲ’, were calculated by origin. Linear fitting of relation was made between A1 562/A1 464 and urea concentration in milk. The results show that the A1 562/A1 464 is linear with urea concentration in milk, with a regression coefficient of 0.96. The study is important to improving quality of dairy products and protecting the benefit of consumers, and takes on crucial social significance and application prospect.
杨仁杰, 刘蓉, 徐可欣. 基于中红外光谱检测牛奶中掺杂的尿素[J]. 光谱学与光谱分析, 2011, 31(9): 2383. YANG Ren-jie, LIU Rong, XU Ke-xin. Adulteration Detection of Urea in Milk by Mid-Infrared Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2011, 31(9): 2383.