Method for identifying tea-leaf origin by infrared spectrum
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A technology of infrared spectroscopy and tea, applied in the field of spectral analysis, to achieve the effect of accelerated analysis, no environmental pollution, and easy operation
Inactive Publication Date: 2009-04-22
HEBEI UNIVERSITY
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Although tea and medicinal materials belong to plant samples and have similar situations, the research on the application of infrared spectroscopy in the
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Embodiment 1
[0031] Embodiment 1, establish the production area characteristic line of the tea of Jiangsu and Zhejiang production areas
[0032] Taking Xinyang Maojian (latitude 31°50＂ ), Dongting Biluochun (latitude 31°2＂ ), West Lake Longjing (latitude 30°27＂ ), Junshan Yinzhen (latitude 29°37＂ ) is the standard product,
[0033] (1) Dry the standard tea sample at 40°C to constant weight, put it into a pulverizer and pulverize it, pass through a 160-mesh sieve, mix and grind 2 mg of the sample with 300 mg of dried potassium bromide powder under the irradiation of an infrared lamp for 10 min, and then Weigh out a certain amount, press the tablet and leave it for measurement, and keep the temperature and humidity in the room basically the same during the experiment;
[0034] (2) Utilize a Fourier transform infrared spectrometer to detect the mid-infrared spectrum of the above-mentioned sample slices, and repeat each sample 10 times. The acquired infrared spectra were preprocessed by...
Embodiment 2
[0048] Embodiment 2, establish the producing area characteristic line of the tea of Fujian producing area
[0049] Anxi Tieguanyin (latitude 25°06＂ ), Quanzhou Tieguanyin (latitude 24°9＂ ), Fujian Biluochun (latitude 24°74＂ ), Taiwan Oolong (latitude 24°07＂ ) as a standard product, the average deviation analysis of the above-mentioned teas is carried out according to the following steps, and the characteristic line of its origin is obtained, and the origin information of a certain tea in different aspects is identified based on it:
[0050] (1), (2) are the same as in Example 1.
[0051] (3) Choose Taiwan oolong (latitude) from the southernmost Fujian production area 24°07＂ ) is the reference tea. Average deviation analysis is identical with embodiment 1, by Figure 4 The relationship between the average deviation of the mid-infrared spectrum and the latitude of the tea produced in Fujian is shown. The relationship between the average deviation and the latitude of the ...
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Abstract
The invention provides a method for identifying production place of tea by using infrared spectrum technology, which comprises the following steps: production place typical lines of tea in place of origin are constructed; B. detecting sample: tea samples to be detected are taken and detected under the same condition with the standard sample respectively to obtain standard mid-infrared spectrums, average deviations between the tea samples and reference tea in production place are calculated according to the spectrums, and difference values between the average deviations and the production place typical lines are calculated, if the difference value is within standard deviation range, the tea sample belongs to the production place, otherwise, the tea sample does not belong to the production place. The method has the following advantages: 1. the analyzing result is not affected by subjective consciousness, thereby providing an impersonal evaluation criterion; 2. according to similarity theory, the average deviation can represent the difference between infrared spectrums of tea more accurately; 3. component separation, extraction and the like on tea are not needed before detecting infrared spectrum of the tea, which simplifies the operation, greatly improves the analyzing speed and reduces the detecting cost without environment pollution.
Description
technical field [0001] The invention relates to a method for identifying the origin of tea with infrared spectrum technology, belonging to the technical field of spectral analysis. Background technique [0002] Tea is one of the most consumed beverages in the world today. With the continuous increase in the output and trade volume of tea products, quickly identifying the origin, authenticity, and adulteration of tea has direct practical significance for maintaining the Chinese tea brand and improving the quality of tea. . Traditional tea identification methods are sensory evaluation and chemical methods. Among them, the results of sensory evaluation are greatly disturbed by human factors and the external environment, which affects the objectivity of the results; although chemical methods can accurately identify tea leaves, it is time-consuming to measure the contents of various chemical components that affect the quality of tea leaves according to the national tea testing s...
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