A method for distinguishing the aroma level of pekoe silver needles based on electronic nose detection information

Abstract

The invention relates to a pekoe aroma grade discrimination method based on metal oxide type electronic nose detection information. The method comprises the steps of sample preparation, detection information collection and construction of Logistic regression discrimination connection functions and discrimination result probability formulas of various grades of samples. According to the method, the problem that in the manual assessment process, assessment cannot be conducted for a long time due to sensory fatigue is effectively solved; discrimination result errors among different assessment personnel are well eliminated, and the stability and consistency of pekoe aroma grade discrimination results are improved; the whole assessment process is convenient and rapid, the consumed time is short, and the discrimination time that each sample consumes after sample preparation is completed is shorter than 5 min; a model analysis result shows that the method has the good stability, and the consistency with manual assessment results is higher than 90%; the very good practical value is achieved, and the significance on application of the automated control means in the pekoe production process, evaluation expression of the final tea product quality and marketing and circulation is achieved.

Description

technical field [0001] The invention relates to a method for discriminating tea grades, in particular to a method for discriminating the fragrance grades of pekoe silver needles based on electronic nose detection information, and belongs to the technical field of food. Background technique [0002] Baihao Yinzhen belongs to the category of white tea, one of the top ten famous teas in China, and its origin is Fuding City and Zhenghe County, Fujian Province. The raw materials of Baihao Yinzhen are collected from specific tea tree varieties, and the unique processing technology is used to form the unique quality characteristics of Baihao Yinzhen, which is covered with pekoe on the outside, light yellow and bright in color, fresh and mellow, sweet and fragrant. [0003] The fragrance of Baihao Silver Needle is based on the strong fragrance, freshness and purity. Traditionally, the evaluation of aroma grades needs to be completed by the "sensory" of the reviewers. Not only the re...

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Problems solved by technology

[0003] The aroma of Baihao Silver Needle is based on the strong, fresh and pure aroma. Traditionally, the evaluation of aroma grades needs to be completed by the "sense" of the reviewers. Not only does the review period take a long time, but it is also susceptible to interference from various subjective and external factors. The "consistency" and "quantification" of the data are insufficient, and it is difficult to objectively and stably characterize its actual quality. Therefore, it is necessary to find a standardized and easy-to-operate method to realize the stable discrimination of the grade of Baihaoyinzhen.

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