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High-sensitivity food colorant detection method

A high-sensitivity, high-sensitivity detection method technology, applied in the detection of trace food colorants, in the field of food colorant detection, can solve the problems of complex operation, time-consuming, low sensitivity of near-infrared spectroscopy analysis technology, etc., to achieve simple detection process, The effect of fast detection speed and good Raman enhancement effect

Inactive Publication Date: 2017-05-31
CHINA JILIANG UNIV
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Problems solved by technology

The sensitivity of near-infrared spectroscopy analysis technology is low, and it is difficult to meet the needs of low detection limits; while other instrumental analysis methods have high sensitivity and good reproducibility, but at the same time, they have disadvantages such as time-consuming and complicated operation, which cannot meet the needs of on-site detection of food colorants. The need for rapid and accurate detection

Method used

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  • High-sensitivity food colorant detection method

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Embodiment

[0029] Embodiment: the detection of food colorant carmine

[0030] Step 1: Preparation of flower-shaped silver nanoparticles SERS substrate: Take 0.5ml of 1mol / L silver nitrate solution, 2mL of 1% polyvinylpyrrolidone solution and 15mL of deionized water and mix them with magnetic force; stir evenly and add quickly 0.2mol / L ascorbic acid solution 1mL, continue to stir for 10min, pour it into a centrifuge tube, centrifuge at a centrifugal rate of 5000-8000r / min for 15min, pour off the supernatant, add deionized water to wash and dissolve to obtain nano-silver sol; finally The nano-silver sol was dropped on a clean silicon wafer, and vacuum-dried to obtain a flower-like nano-silver particle SERS substrate.

[0031] The second step: the preparation of carmine standard solution: take 0.06g of carmine powder and dissolve it in 100mL of deionized water to obtain 10 -3 mol / L carmine standard solution, and then diluted respectively to obtain a concentration of 10 -4 mol / L, 10 -5 mo...

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Abstract

The invention discloses a high-sensitivity food colorant detection method, which comprises the steps of dropping 10<-8>mol / L to 10<-3>mol / L of food colorant standard liquid on a flower-shaped nano silver particle SERS (Surface Enhanced Raman Scattering) substrate, and collecting a raman spectrogram and data of the food colorant standard liquid through a raman spectrometer; further adopting a principal component analysis method for processing the raman spectrum data of the food colorant standard liquid so as to obtain a raman spectrum intensity-food colorant concentration relational expression of the food colorant standard liquid; processing food to be detected into a solution, dropping the solution on the flower-shaped nano silver particle SERS substrate, collecting an SERS spectrogram and data of the food solution to be detected through the raman spectrometer, comparing with the SERS spectrogram of the food colorant standard liquid to obtain the attribute of a colorant in food to be detected, and obtaining the content of the colorant in the food to be detected through the SERS spectrum intensity-food colorant concentration relational expression of the food colorant standard liquid. The method can be used for detecting a trace colorant in the food, and is simple to operate.

Description

technical field [0001] The invention relates to a detection method of food colorants, in particular to a detection method of trace food colorants, and belongs to the technical field of food safety detection. Background technique [0002] Food safety is closely related to people's production and life, as well as economic and social development. Since the outbreak of the melamine incident and the gutter oil incident, food safety issues have attracted more and more attention from the country and the people, and the abuse of food colorants has led to food safety issues. Therefore, it is impossible to completely eliminate the hazards of food colorants. Improving supervision measures and adopting scientific testing methods can minimize the harm of food colorants to human health. At present, the detection methods for food colorants at home and abroad mainly include ultraviolet spectrophotometry, high performance liquid chromatography, near-infrared spectral analysis technology and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 白阳徐碧洁刘越谢莹莹吴燕雄梁培黄杰
Owner CHINA JILIANG UNIV
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