Method for selecting spectrum scope in tobacco water-soluble sugar near infrared quantification model

Abstract

The invention relates to a method for selecting spectrum scope in tobacco water-soluble sugar near infrared quantification model. Through research of a molecule structure of water-soluble sugar, synthesis frequency and frequency multiplication absorption scope at a near infrared spectrum of hydrogen containing group in the water-soluble sugar can be deduced, an interaction verification correlation coefficient and interaction verification mean square deviation of a near infrared model are taken as evaluation indexes for further optimization, and optimum spectrum scope of tobacco water-soluble sugar when the near infrared quantification model is established can be finally determined. Three different spectrum scopes are used for establishing the near infrared quantification model of tobacco water-soluble total sugar and reducing sugar, and then a comparison is carried out. A)a whole spectrum scope is 3800-10000cm<-1>; B)a spectrum scope is selected through automatic optimization by TQ Analyst; and C)the spectrum scope is determined through molecular structure analysis. According to the data, the evaluation index of the model is obviously better than other two methods through the molecular structure analysis.

Description

technical field [0001] The invention belongs to the technical field of physical and chemical testing of tobacco and tobacco products, and mainly relates to the technical field of chemical composition determination of tobacco and tobacco products, in particular to a method for selecting a spectral range in a near-infrared quantitative model of tobacco water-soluble sugar. Background technique [0002] The water-soluble sugar in tobacco has an important impact on the quality of tobacco leaves and is the main factor determining the alcohol and degree of smoke. In the tobacco industry, the analysis and determination of water-soluble sugar content is of great significance to the quality control of finished cigarettes. [0003] In recent years, near-infrared spectral analysis technology has been widely used in the tobacco industry, but this technology uses chemometric methods to extract useful sample content information from complex spectral backgrounds, so its analysis results ar...

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Problems solved by technology

[0003] In recent years, near-infrared spectral analysis technology has been widely used in the tobacco industry, but this technology uses chemometric methods to extract useful sample content information from complex spectral backgrounds, so its analysis results are vulnerable to various factors. Impact

At present, it has been found that in the process of establishing a near-infrared quantitative model, different spectral ranges are used, and the quantitative results are significantly different, but there is no optimal selection method for the spectral range.

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