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Method for detecting paraffin in rice based on space angle

A technology of space angle and rice, applied in the direction of measuring devices, instruments, complex mathematical operations, etc., can solve the problems of cumbersome and high mathematical calculation requirements, and achieve the effect of eliminating baseline offset

Pending Publication Date: 2021-12-28
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Method for detecting paraffin in rice based on space angle
  • Method for detecting paraffin in rice based on space angle
  • Method for detecting paraffin in rice based on space angle

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Abstract

The invention discloses a method for detecting paraffin in rice based on a space angle. The method includes: analyzing an infrared spectrum of a paraffin and an infrared spectrum of a rice extracting solution in a vector space, selecting a liquid paraffin spectrum as a reference vector, calculating an angle value between a spectrum vector of each to-be-detected sample and a spectrum vector of the liquid paraffin, and determining a judgment threshold value whether paraffin is added or not by combining statistics; and establishing a linear regression equation of the coating weight-angle value of the paraffin in the rice to realize qualitative and quantitative analysis of the paraffin added in the rice. A judgment threshold value theta of whether paraffin is added into the rice is 0.4029, and when the waxing amount of the long-shaped rice and the polished round-grained rice is 0.0378%-0.2106%, the linear relation of the established regression equation is good, and the precision of the method is 1.24%-3.56%. The method has a good application prospect in the aspect of food safety detection.

Description

technical field [0001] The invention relates to the field of detection of illegal addition of paraffin in rice, in particular to a method for detecting paraffin in rice based on spatial angle. Background technique [0002] Illegal addition of paraffin to rice occurs from time to time, and the national standard GB / T21309-2007 "Inspection of Rice Coated with Grease or Paraffin" uses oil spot method, gas chromatography and micro-column chromatography. The qualitative analysis of paraffin in rice has been reported to use high performance liquid chromatography-gas chromatography, gas chromatography-mass spectrometry, saponification, infrared spectroscopy and other methods. Methods such as oil spot method, micro-column chromatography, and saponification method are greatly affected by experimental system errors and negligent errors, and the results are unstable. Liquid chromatography, gas chromatography, and gas-mass spectrometry More cumbersome, longer analysis time and higher co...

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/74G01N30/86G06F17/11G06F17/15
CPCG01N30/02G01N30/06G01N30/74G01N30/8696G06F17/11G06F17/15G01N2030/047G01N2030/743Y02A40/10
Inventor 唐怡
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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