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Device and method for quickly and non-destructively identifying aged grains of different years

An aging and fast technology, applied in measuring devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of large individual differences in testers, limited sensitivity, sample damage, etc., and achieve the effect of rapid and non-destructive identification.

Inactive Publication Date: 2018-05-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

Among them, the acid-base indicator method is the most widely used in the field of rapid detection, but this method relies on color changes for identification, has large errors, limited sensitivity, and is greatly affected by individual differences in testers.
Other methods such as the fatty acid value method (a grain fatty acid value detection reagent, detection method and its application, CN201610431798.4) need to use more chemical reagents, the manual operation is complicated, and the sample is damaged

Method used

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  • Device and method for quickly and non-destructively identifying aged grains of different years

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Embodiment 1

[0053] Aiming at the examination of the performance of a device and method for quickly and non-destructively identifying aged grains of different years described in the present invention, the experiment took aged rice of four different years (respectively 2011, 2012, 2013 and 2014) as objects , use the online analysis device to analyze the sample gas products released by them online, and obtain their characteristic spectra, so as to realize rapid and non-destructive identification. The flow rate of high-purity nitrogen gas entering the sample bottle is set to 100mL / min, and the mass of the aged grain sample used is 1.0g. In view of the complexity of the released sample gas, the vacuum ultraviolet lamp is used as the ion source, and the photon energy emitted by it is 10.6eV, which can ionize most organic substances, and the obtained characteristic spectrum is simple, mainly molecular ions and fragment ions of the substance Rarely, the air pressure in the ionization zone is main...

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Abstract

The invention provides a device and a method for rapidly and non-destructively identifying aged grains of different years. The on-line analysis system used includes an aged grain sampling device, a gas supply device and a gas detection device. The on-line analysis method uses the on-line analysis system, and comprises the following steps: a certain amount of an aged grain sample is placed in the sampling device and heated to a certain temperature to release volatile substances contained in the sample, the gas supply device provides a carrier gas to carry the volatile products to flow out the sampling device, a portion of the flowed-out gas directly enters the gas detection device for analysis, and the rest of the flowed-out gas is discharged as tail gas. By varying the flow rate of the carrier gas and the heating temperature, volatile products with different concentrations can be obtained. The volatile products directly enter the gas detection device with the carrier gas without off-line concentration, derivatization, and other steps, and no reagent is needed. The operation is simple, and the analysis is accurate. The rapid non-destructive identification of the aged grains can be realized.

Description

technical field [0001] The present invention relates to a device and method for quickly and non-destructively identifying aged grains of different years. Specifically, the on-line analysis device is used to heat samples of aged grains of different years, and the carrier gas is used to take the volatilized sample gas out of the sample bottle Finally, the effluent gas quickly enters the gas detection device through the gas sampling tube for ionization analysis, and obtains their respective characteristic spectra, so as to achieve the purpose of online distinction of aged grains of different years. Background technique [0002] According to relevant regulations, grains that are not suitable for direct use as rations are defined as aged grains. According to relevant experts, the storage period of aged grain is generally more than 3 years, and the value of Aspergillus flavus exceeds the standard, and Aspergillus flavus is the strongest carcinogen at present, it can still survive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64
CPCG01N27/64
Inventor 谢园园李海洋侯可勇
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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