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Method for discriminating places of production of oolong tea based on biochemical components of tea

A discriminant method, the technology of oolong tea, applied in the direction of analyzing materials, measuring devices, instruments, etc., can solve the problems of not considering the size of the occurrence probability, not giving the estimation of the posterior probability and misjudgment rate, loss, etc., to achieve the discriminative effect good effect

Active Publication Date: 2012-09-26
FUJIAN AGRI & FORESTRY UNIV
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Problems solved by technology

The famous Fisher discriminant is only based on the idea of ​​variance analysis, linearly transforms the discriminant variable, and then uses it for distance discrimination.
Distance discrimination and Fisher discrimination have no specific requirements on the distribution type of variables. Their shortcomings are that they do not consider the size of the overall occurrence probability, and they cannot give the estimated posterior probability and misjudgment rate of the forecast, as well as the error caused by misjudgment. loss

Method used

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  • Method for discriminating places of production of oolong tea based on biochemical components of tea
  • Method for discriminating places of production of oolong tea based on biochemical components of tea
  • Method for discriminating places of production of oolong tea based on biochemical components of tea

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Embodiment Construction

[0021] This embodiment provides a method for discriminating the origin of oolong tea based on the biochemical components of tea leaves, which is characterized in that: it is suitable for discriminating the ownership of oolong tea from three origins of southern Fujian, northern Fujian and Guangdong, and constructs a Bayesian discriminant function for the origin of oolong tea. The expression of this function is :

[0022] f 闽南 =3.057x 6 +5.061x 1 +14.557x 7 +160.863x 4 +0.025x 8 +0.332x 9 -46.852;

[0023] f 闽北 =1.199x 6 +8.070x 1 +16.476x 7 +200.408x 4 +0.018x 8 +0.527x 9 -52.8502;

[0024] f 广东 =5.586x 6 +8.905x 1 +5.534x 7 +183.393x 4 +0.021x 8 +0.493x 9 -68.277;

[0025] where the independent variable x 1 is caffeine, x 4 for C, x 6 for EGCG, x 7 is ECG, x 8 is manganese, x 9 is zinc, the value of the independent variable is substituted into the Bayes discriminant function, and the function category corresponding to the calculated maximum value is...

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Abstract

The invention relates to a method for discriminating places of production of oolong tea based on biochemical components of tea, and the method is suitable for discriminating the areas of oolong tea in the three places of production including southern Fujian, northern Fujian and Guangdong. The method is characterized by comprising the following steps: firstly substituting forward Bayes discriminant functions of the places of production of oolong tea, detecting the independent variables such as caffeine, C, EGCG, ECG, manganese and zinc, substituting the values of the independent variables into the Bayes discriminant functions and calculating the function category, corresponding to the obtained maximum, namely the area of the tea. The method has the following beneficial effects: the accurate rate of the discriminant functions reaches 95% and the discrimination effect is good; and the method is simple and practical, can be used for realizing the rapid and effective discrimination of the three places of production of oolong tea including southern Fujian, northern Fujian and Guangdong only through simple calculation with the values of the six biochemical components, not only can meet the requirements of the ordinary consumers for tea discrimination but also provides reference for tea discrimination in international tea trades.

Description

technical field [0001] The invention relates to the technical field of tea identification, in particular to a method for identifying the origin of oolong tea based on the biochemical components of tea. Background technique [0002] As a special tea in my country, oolong tea is sold well all over the world for its unique "fragrant floral and fruity aroma", and has become one of the three major teas sold in the world. The quality of oolong tea is not only affected by the variety and season, but also restricted by the region. Different places of origin have different quality. From tasting to trade, the identification of oolong tea products is involved, but currently the main means of identifying the origin of oolong tea is still sensory evaluation. Sensory evaluation is to judge teas based on human senses of smell, taste, vision and touch. It can quickly identify the main sensory characteristics of tea and sharply identify abnormal quality phenomena. It is currently the main m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 孙威江董青华
Owner FUJIAN AGRI & FORESTRY UNIV
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