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Method for efficiently identifying differential small molecular substances in yellowed and normal unhusked rice

A technology of small molecular substances and detection methods, which is applied in the field of detection of small molecular substances that efficiently identify differences between yellowing and normal rice, can solve the problem of not detecting the change of volatile components in yellowing rice, and achieve the effect of simple operation

Inactive Publication Date: 2019-02-12
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at this stage, there is no effective means to detect the change of volatile components in yellowing rice

Method used

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  • Method for efficiently identifying differential small molecular substances in yellowed and normal unhusked rice
  • Method for efficiently identifying differential small molecular substances in yellowed and normal unhusked rice
  • Method for efficiently identifying differential small molecular substances in yellowed and normal unhusked rice

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Experimental program
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Effect test

Embodiment 1

[0020] 1) Take 10g of yellowed glutinous rice in a 30mL headspace extraction bottle for headspace solid-phase microextraction; the temperature of the automatic headspace sampling unit is set at 70°C, the equilibration time is 15min, and the temperature of the injection needle is 98°C. The balance speed is 500rpm.

[0021] 2) After the extraction is completed, insert the autosampler immediately, and the injection volume is 500 μL; the chromatographic column type of GC-IMS in step 3) is FS-SE-54-CB-0.5, the column length is 15m, and the inner diameter is 0.53mm; Column temperature is 40°C, IMS temperature is 45°C, carrier / drift gas is N 2 , the analysis time is 15min.

[0022] 3) Using GC×IMS Library Search software, the qualitative determination of each unknown volatile component in the sample is obtained from the NIST database and IMS database built into the software; the peak volume in the exported data indicates the relative content of each volatile component.

Embodiment 2

[0023] Embodiment 2: The difference between embodiment 2 and embodiment 1 is that the sampling setting parameters of the automatic headspace sampling unit in step 1) are different: take 3g of polished rice in a 10mL headspace extraction bottle, and the automatic headspace sampling unit The temperature was set at 60 °C, the equilibration time was 10 min, the temperature of the injection needle was 98 °C, the equilibrium speed was 500 rpm, and the injection volume was 500 μL.

Embodiment 3

[0024] Embodiment 3: The difference between embodiment 3 and embodiment 1 is that the sampling setting parameters of the automatic headspace sampling unit in step 1) are different: take 20g of polished rice in a 40mL headspace extraction bottle, and the automatic headspace sampling unit The temperature was set at 95°C, the equilibration time was 30min, the temperature of the injection needle was 98°C, the equilibrium speed was 500rpm, and the injection volume was 500μL.

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Abstract

The invention belongs to the field of food detection, and particularly relates to a method for efficiently identifying differential small molecular substances in yellowed and normal unhusked rice. Themethod comprises the following steps that 1) an automatic headspace sample introduction unit is utilized, and a gas environment is balanced by increasing the temperature, so that flavor substances ina to-be-detected object are effectively volatilized; 2) gas chromatography-ion mobility spectrometry is used for detecting the volatile substances; and 3) GCXIMS Library Search software is utilized,and the substances can be subjected to qualitative analysis by applying an NIST database and an IMS database built in the software. According to the method, the advanced GC-IMS technology is used forcarrying out extraction detection and qualitative analysis on volatile components in the yellowed unhusked rice. Research results show that the method disclosed by the invention can be used for rapidly analyzing the volatile substances in the yellowed and normal unhusked rice through the GC-IMS technology.

Description

technical field [0001] The invention belongs to the field of food detection, and in particular relates to a detection method for efficiently identifying differential small molecular substances in yellowing and normal rice. Background technique [0002] Rice yellowing is an important problem facing the rice industry. Color is an important factor determining the quality of rice. Yellowing of rice will reduce its nutritional value and commercial value, and bring great losses to the rice industry. One of the most important characteristics of rice deterioration is the production of undesirable aroma compounds. Factors such as the growth environment of rice, post-harvest drying method, storage method, and storage environment will affect the changes in the types and contents of volatile substances in rice. But at present, there is no effective means to detect the change of volatile components in yellowing rice. Contents of the invention [0003] The purpose of the present invent...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/96
CPCG01N30/02G01N30/96
Inventor 周中凯马建飞张晓旭
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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