Method for monitoring tea production in real time by adopting near infrared spectrum

A near-infrared spectroscopy, real-time monitoring technology, applied in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of cumbersome operation and long time, and achieve the effect of rapid adjustment

Inactive Publication Date: 2014-04-23
GUIZHOU ACADEMY OF TESTING & ANALYSIS +3
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a real-time detection method that can be used for on-line production in view of the defects that tea moisture measurement needs to be carried out in a laboratory environment, and the operation is cumbersome and time-consuming. to analyze

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  • Method for monitoring tea production in real time by adopting near infrared spectrum
  • Method for monitoring tea production in real time by adopting near infrared spectrum
  • Method for monitoring tea production in real time by adopting near infrared spectrum

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Embodiment Construction

[0020] (1) Preparation of tea samples: 200 grams of tea samples were collected at various production stages (such as before, after electric heating, after microwave finishing, etc.), numbered, packed in aluminum foil sample bags, sealed and refrigerated;

[0021] (2) Collection of near-infrared spectra: Antaris II near-infrared spectrometer produced by ThermoFisher in the United States is used. The software adopts standard workflow (SOP) and analysis methods based on Workflow to collect diffuse reflectance spectra of tea samples. The specific method is to place the tea samples in the instrument-specific quartz opening sample cup (4.78cm diameter), and rotate the sample cup during collection to reduce the error caused by sample inhomogeneity. The acquisition parameters are: the number of scans is 64, the resolution is 8cm-1, and the spectral range is 10000-3800cm-1. High-sensitivity InGaAs detector, automatically collect background, see attached figure 2 ;

[0022] (3) Diffu...

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Abstract

The invention discloses a method for monitoring tea production in real time by adopting a near infrared spectrum. The method is characterized by comprising the following steps: (1) preparing a tea sample, namely collecting a tea sample with representativeness; (2) acquiring the near infrared spectrum, namely acquiring a diffuse reflection spectrum chart of the tea sample based on Workflow setting SOP (Standard Operation Process) and analysis method; (3) preprocessing the diffuse reflection spectrum chart, namely performing first-order or second-order derivative+Norris noise filtering processing on the spectrum chart; (4) establishing a model, namely establishing a mathematical model between data measured by the near infrared spectrum chart and the standard method by using special chemometrics software; (5) verifying the model, namely measuring a novel tea sample on a near infrared instrument according to a method which is identical to the step (2), predicting by using the model established in the step (4), and comparing the measured tea sample with the result measured according to a national standard method; and (6) performing field detection, namely performing near infrared spectrum scanning on a sample in the production field, measuring by using the model established in the step (4), and adjusting the field production conditions according to the measurement result.

Description

technical field [0001] The invention relates to a method for real-time monitoring of production, in particular to a method for realizing real-time monitoring of tea production by using near-infrared spectroscopy. Background technique [0002] The chemical composition of tea is complex. According to the national standard, in the process of tea production and inspection, it is necessary to analyze the water content, tea polyphenols, amino acids and other indicators in the tea. Determination of these indicators requires complex chemical methods, such as liquid chromatography, oven, ultraviolet-visible spectrophotometer and other instruments, and sample analysis must be carried out under laboratory conditions. It takes a few days for the test report to be available. Therefore, tea production mainly relies on the experience of producers, and it is impossible to achieve online scientific and reliable quality control. [0003] Moisture content in tea is the key indicator that nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3563G01N21/359
Inventor 陆洋金循周涛周国兰宋光林谭世喜王大霞张明
Owner GUIZHOU ACADEMY OF TESTING & ANALYSIS
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