Method for rapidly identifying irradiation absorbed dose of tea by using electronic nose

A technology of absorbed dose and electronic nose, applied in the direction of material resistance, etc., can solve the problems of complex processing, inability to distinguish manually by gas chromatography, high price, etc., and achieve the effect of simple processing, fast and efficient detection

Active Publication Date: 2015-12-23
ANHUI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pretreatment of this method is complex, requiring steps such as grinding, sieving, weighing, and packaging, and requires expensive ESR spectrometers and professional technicians, which is difficult for ordinary laboratories to implement.
[0004] The use of electronic nose technology to identify irradiated tea is based on the fact that irradiation treatment will cause changes in some substances in tea, which are so subtle that they cannot be distinguished by gas chromatography or artificially

Method used

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  • Method for rapidly identifying irradiation absorbed dose of tea by using electronic nose
  • Method for rapidly identifying irradiation absorbed dose of tea by using electronic nose
  • Method for rapidly identifying irradiation absorbed dose of tea by using electronic nose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method to identify the radiation absorbed dose of Keemun black tea using PEN3 electronic nose.

[0029] 1. Irradiate tea samples with known different absorbed doses;

[0030] use 60 Co gamma ray irradiation treatment of Keemun black tea. The absorbed absorbed dose of irradiation is 0kGy, 1kGy, 5kGy, 9kGy.

[0031] 2. Use the electronic nose to sequentially detect Keemun black tea samples with known radiation absorption doses, and convert the odor signal into electrical signal data;

[0032] Identification method: Take 2.0g Keemun black tea samples that have been irradiated with different absorbed doses and then dry, and put them into the headspace sample bottle of the PEN3 portable electronic nose:

[0033] Detection conditions: sample temperature: 25±5°C; headspace: 100-120mL; enrichment time: 25-30min;

[0034] Electronic nose detection parameters: cleaning time is set to 120s, signal acquisition time is 90s, sampling once per second;

[0035] Twelve replicates...

Embodiment 2

[0092] The applicant identified whether Fuzhuan brick tea was irradiated according to the determination and identification method described in Example 1, and the results were as follows:

[0093] 1. Irradiation treatment of tea samples with different absorbed doses;

[0094] use 60 Fuzhuan brick tea was irradiated with Coγ-rays, and the absorbed radiation doses were: 0kGy, 1kGy, 5kGy, 9kGy.

[0095] 2. Electronic nose detection;

[0096] Take 2.0 g of dried Fuzhuan brick tea samples that have been irradiated with different absorbed doses, and put them into the headspace sample bottle of the PEN3 portable electronic nose, and the other steps are the same as step 2 in Example 1.

[0097] 3. Draw the response diagram of the electronic nose to the volatile substances of Fuzhuan brick tea. According to the method in Example 1, the obtained characteristic values ​​A, B, and C are 25s, 45s, and 90s, respectively;

[0098] 4. Extract the characteristic value of the signal of PEN3 p...

Embodiment 3

[0117] The applicant identified whether Huangshan Maofeng was irradiated according to the measurement and identification method described in Example 1, and the results were as follows:

[0118] 1. Irradiation treatment of tea samples with different absorbed doses;

[0119] use 60 Huangshan Maofeng was irradiated with Coγ-rays at concentrations of 0kGy, 1kGy, 3kGy, and 5kGy.

[0120] 2. Electronic nose detection;

[0121] Take 2.0 g of dried Huangshan Maofeng samples that have been irradiated with different absorbed doses, and put them into the headspace sample bottle of the PEN3 portable electronic nose. Others are the same as step 2 in Example 1.

[0122] 3. Draw the response diagram of the electronic nose to the volatile substances of Huangshan Maofeng, according to the method of Example 1, the obtained characteristic values ​​A, B, and C are 25s, 45s, and 90s, respectively;

[0123] 4. Extract the characteristic value of the PEN3 portable electronic nose signal to Huangs...

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Abstract

The invention discloses a method for identifying whether tea is irradiated and irradiation absorbed dose and a new application of an electronic nose. The identifying method comprises: employing tea samples which are treated by irradiation of different known doses; detecting the tea samples whose irradiation absorbed doses are known by the electronic nose; drawing a response diagram of tea volatile substances detected by the electronic nose; determining an identification evaluation time; calculating the variance contribution rate of an electronic nose sensor characteristic constant of each main component and the correct rate of initial group case return discrimination, and preferably choosing an effective sensor; calculating to obtain classification function coefficients of different radiation doses, and obtaining a classification function for identifying a tea sample radiation dose; detecting an unknown tea sample by the electronic nose, calculating with the classification function, and obtaining a radiation dose of the tea. Compared with the prior art for identifying tea, the identifying method provided by the invention has the characteristics of simple method, few steps, fast speed, high identification efficiency, high accuracy, etc., and the method is suitable for identifying whether the tea is irradiated or the irradiation absorbed dose.

Description

technical field [0001] The invention relates to a method for identifying irradiated food, in particular to a method for identifying irradiated tea with an electronic nose. Background technique [0002] An electronic nose is a device composed of multiple chemical sensors (referred to as a gas sensor array) with overlapping properties and an appropriate pattern recognition method, which has the ability to identify simple and complex odors. It is different from ordinary chemical analysis instruments, such as chromatographs, spectrometers, capillary electrophoresis instruments, etc. It does not obtain qualitative and quantitative results of one or several components in the tested sample, but gives the overall information of the volatile components in the sample. Also known as "fingerprint" data. This is the same as the nose of humans and animals, what "smells" is the overall breath of the target object. The electronic nose is generally composed of three parts: gas sensor array...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
Inventor 张海伟叶馨今周裔彬张雨露张晓晴
Owner ANHUI AGRICULTURAL UNIVERSITY
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