Non-linear fingerprint spectrum detection method of selenium-rich tea leaves

A technology of fingerprint and selenium-enriched tea is applied in the field of fingerprint detection of selenium-enriched tea, and achieves the effects of good reproducibility, simple operation and strong characteristic.

Pending Publication Date: 2019-04-19
NINGDE NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, there is no related technology that establishes the corresponding fingerprints of selenium-enriched tea and detects them according to the fingerprints

Method used

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  • Non-linear fingerprint spectrum detection method of selenium-rich tea leaves
  • Non-linear fingerprint spectrum detection method of selenium-rich tea leaves
  • Non-linear fingerprint spectrum detection method of selenium-rich tea leaves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Grind the sample tea leaves and sieve them to make tea powder for later use; weigh 0.3000 of the tea powder, and add 0.01 mol of sulfuric acid and 0.00002 mol of cerium sulfate to the reactor in order to keep the total reaction volume at 100 mL. Carry out magnetic stirring for a predetermined time; then add 0.001mol potassium bromate and 0.0005mol malonic acid and use the CHI660E nonlinear workstation to scan the spectrum, record the E-t curve until the potential disappears, and obtain the sample nonlinear fingerprint; the sample nonlinear fingerprint for analysis.

[0030] like figure 1 As shown, it can be seen that the oscillation system has a short induction period, and the induction time tin is 90s. As the oscillation proceeds, the amplitude becomes larger and larger. At 270s, the amplitude reaches the maximum, and then the amplitude gradually decreases until the oscillation disappear, the oscillation life ts is 800s, and the oscillation period tp is 11s. Further ...

Embodiment 2

[0032] Crush the sample tea leaves and sieve them into tea powder for later use; weigh 0.7000 g of the tea powder, and add 0.03 mol of sulfuric acid and 0.00005 mol of cerium sulfate to the reactor in order to keep the total reaction volume at 100 mL. Magnetic stirring is carried out for a predetermined time; then add 0.005mol potassium bromate and 0.003mol malonic acid and use the CHI660E nonlinear workstation to scan the spectrum, record the E-t curve until the potential disappears, and obtain the sample nonlinear fingerprint; the sample nonlinear fingerprint Spectrum for analysis.

[0033] Reproducibility test: parallel determination 3 times, by Figure 3-1 to Figure 3-3 It can be seen that the same tea samples from the same source have the same chemical composition and content, and under the same experimental conditions, the various indicators of the measured nonlinear fingerprints are basically the same, and the nonlinear fingerprints have good reproducibility.

Embodiment 3

[0035]Crush the sample tea leaves and sieve them into tea powder for later use; weigh 0.5000 g of the tea powder, and add 0.02 mol of sulfuric acid and 0.00004 mol of cerium sulfate to the reactor in order to keep the total reaction volume at 100 mL. Undergo magnetic stirring for a predetermined time; then add 0.002mol potassium bromate and 0.001mol malonic acid and use the CHI660E nonlinear workstation to scan the spectrum, record the E-t curve until the potential disappears, and obtain the sample nonlinear fingerprint; the sample nonlinear fingerprint Spectrum for analysis.

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Abstract

The invention provides a method for detecting a non-linear fingerprint spectrum of selenium-rich tea leaves, which comprises the following steps: S1, crushing sample tea leaves, and sieving to preparetea leaves powder for later use; S2, weighing 0.3000-0.7000g of tea leaves powder, sequentially adding 0.01-0.03 mol of sulfuric acid and 0.00002-0.00005 mol of cerium sulfate into a reactor on the premise of keeping the total volume of the reaction to be 100 mL, and performing magnetic stirring for a preset time at the temperature of between 25 and 45 DEG C; then adding 0.001-0.005mol of potassium bromate and 0.0005-0.003 mol of malonic acid and carrying out spectrum scanning by using a CHI660E type nonlinear workstation, and recording an E-t curve until the potential disappears to obtain anon-linear fingerprint spectrum of the sample; S3, analyzing the non-linear fingerprint of the sample.

Description

technical field [0001] The invention relates to a fingerprint detection method of selenium-rich tea, in particular to a non-linear chemical fingerprint detection method of selenium-rich tea based on B-Z nonlinear chemical oscillation technology. Background technique [0002] Tea tree is a plant with a strong ability to absorb and enrich selenium. Through bioaccumulation and transformation, tea tree can convert non-biologically active and highly toxic inorganic selenium into safe, effective and low-toxic organic selenium. Chinese tea is almost Both contain selenium, the content is 0.017~6.590mg / kg. Organic selenium in tea accounts for 80% of the total selenium, which is good for human body to absorb. Therefore, tea is an ideal resource for selenium supplementation. Regular drinking of tea, especially selenium-enriched tea, can Improve the selenium nutrition of the human body and prevent diseases. In addition, selenium-enriched tea contains not only organic selenium, which is...

Claims

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Application Information

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IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 庄凰龙吴艳玲应少明刘镇敏王景月
Owner NINGDE NORMAL UNIV
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