Mid-infrared-near-infrared correlation spectrum discrimination method for milk mixed with melamine

Abstract

The invention relates to an intermediate infrared-near infrared correlation spectrum discriminating method for melamine-doped milk. The method comprises the following steps: (1) preparing pure milk for experiment and melamine-doped milk; (2) scanning intermediate infrared spectrums and near infrared spectrums of the pure milk for experiment and the melamine-doped milk; (3) calculating two-dimensional intermediate infrared-near infrared correlation synchronous spectrum matrixes of the pure milk for experiment and the melamine-doped milk respectively; (4) establishing a discriminating model by adopting a multi-dimensional partial least squares method; (5) scanning an unknown sample and calculating to obtain a two-dimensional intermediate infrared-near infrared correlation synchronous spectrum matrix of the unknown sample, and substituting the matrix into the discriminating model, thus judging whether the milk is doped with melamine. According to the invention, the capability of extracting feature information of dopant in milk through the two-dimensional intermediate infrared-near infrared correlation synchronous spectrums is fully utilized, the subjectivity of a direct comparison method for discriminating the doped sample based on the two-dimensional correlation spectrum is overcome, and the method is simple, easy and scientific, and is high in analyzing efficiency and discriminating accuracy.

Description

technical field [0001] The invention belongs to the field of detection methods, in particular to a mid-infrared-near-infrared correlation spectrum discrimination method for milk mixed with melamine. Background technique [0002] Milk has high nutritional value, which contains essential nutrients that promote human growth and maintain a healthy level, such as protein, fat, lactose and other solids. With the improvement of people's living standards, the domestic consumption of dairy products has increased rapidly. Driven by huge economic interests, some unscrupulous traders add various adulterants to milk in order to shoddy and earn illegal profits, which directly endangers human health and causes huge economic losses to dairy processing enterprises. . At present, there are many reports on the doping of milk by spectroscopic methods, but milk is a colloidal liquid that coexists in a suspended state and an opacified state, and has a strong scattering of light. Due to the inf...

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Problems solved by technology

However, the above analysis is basically based on the fingerprint information of the correlation spectrum. By comparing the spectra of the doped sample and the undoped sample one by one, this requires relevant professional and experienced technicians, and there are subjective misjudgments. factors, and for discriminating a large number of samples, the analysis by the above method is very cumbersome and inefficient

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