近红外光谱法检测奶粉中三聚氰胺的方法探讨

Detection of melamine in milk powder by near infrared spectroscopy

中文关键词:  近红外光谱法  奶粉  三聚氰胺

英文关键词:near infrared spectroscopy  milk powder  melamine

中文摘要:

      目的 建立近红外光谱法快速鉴别奶粉中三聚氰胺的掺假。方法 应用奶粉的脂肪、蛋白质、水分、乳糖和灰分5个理化指标建立奶粉的近红外鉴别模型。应用Spectrum软件的PLS1算法对样品进行计算, 并对待鉴别奶粉进行定量分析。结果 本方法能有效识别三聚氰胺质量比在0.05%~0.08%的掺假奶粉, 但不能准确识别有何种掺杂物; 对0.1%以上的掺假奶粉能正确识别出掺假物是三聚氰胺。对样品的脂肪、蛋白质、水份、乳糖和灰分5项理化指标进行定量分析的实际值与样品在模型中的计算值相对误差在10%以内。结论 该方法快速、有效, 可适用于奶粉三聚氰胺掺假的快速筛选和掺假鉴别。

英文摘要:

      Objective To establish a method for the adulteration identification of melamine in milk powder by near infrared spectroscopy. Methods An near-infrared model was built to test the fake milk power by 5 kinds of physicochemical indexes including fat, protein, moisture, lactose and ash, and 5 kinds of physicochemical indexes of the milk powder which passed the determination of this model were quantified by the model through PLS1 algorithm in the software of Spectrum. Results The milk powder with the mass ratio of melamine of 0.05%~0.08% could be recognized as fake milk powder, but couldn’t be recognized the real adulterant, and the milk powder with the mass ratio of melamine over 0.1% could be recognized the impurity of melamine by the method. Five kinds of physicochemical indexes could be quantified by the method, and the relative error between the real value and the calculation value was lower than 10%. Conclusion The method is rapid and valid, which can be used for rapid screening and adulteration identification of melamine in milk powder.