Applications Of Nonlinear Chemical Fingerprint In Identification And Quantitative Analyses Of Beer And Hops

With the improvement of living standards, more attention has been paid on the qualities of life and food by people. Especially with the exposure of food safety incidents in recent years, the problem of food security has been become particularly concerned about by the majority of consumers, which requires our quality supervision departments have high professional quality and professional skills to ensure that the quality of the food, and nonlinear chemical fingerprint technology is generated to adapt to this trend of era. As a new approach for the detection analysis, the technology has a extremely significance on the study of authenticity identification and quality evaluation of food as well as quantitative determination of adulteration. In this paper, the qualitative analysis and quantitative determination in beer and hops were deeply researched by nonlinear chemical fingerprint technology.In the first chapter of this paper, the current quality detection methods of beer and hops and some nonlinear chemical reactions were reviewed, which mainly contained several common reactions, era background, basic principle, main reaction process, E-t expression, basic fingerprint information and similarity calculation method, etc.In the second and third chapters, the applications of nonlinear chemical fingerprint technology in beer quality evaluation and quantitative determination of ethanol were mainly researched. For example, the determining dosage, characteristic, reproducibility and system similarity evaluation of nonlinear chemical fingerprint of beer and so on were studied in detail. Results showed that, as a characterization of cluster components in beer, the nonlinear chemical fingerprint not only has obvious characteristic and good reproducibility, but also contains a large number of intuitive and quantifiable information, which can provide a powerful condition to the brand identification of beer. Meanwhile, the good function relation between the ethanol concentration in beer and the maximum amplitude of the fingerprint has a positive meaning for the quantitative determination of ethanol in beer, and also provides a guideline for the determination of individual component in complex samples.In the fourth and fifth chapters, the application of nonlinear chemical fingerprint technology in the qualitative identification and quantitative determination of hops were unceasingly explored on the basis of research recommended in second and three chapters-For example, the optimizations of determination conditions (such as the drying temperature, reaction temperature and determining dosage, etc.) of each hops were mainly researched, and the fingerprints of some hops were measured under the optimized conditions. Results indicated that the nonlinear chemical fingerprint of each hops has obvious characteristic and good reproducibility. The type of hops can be distinguished by the intuitive characteristic of the fingerprint of hops. The diversity of nonlinear chemical fingerprints of hops can be better reflected by combining with the calculation results of system similarity, which is of great significance to the identifications of species or producing area of hops. In addition, the function relations between main parameter information (such as inductive time, undulant terminal time, etc) of the fingerprint of each mixed hops and the percentage of doping hops were of important significance to the determination of content of each hops in the mixed hops, which also provides a new idea or research approach to the determination of each cluster component content in other complex mixtures. There are22figures,12tables and68references in the paper.