Method of identifying illegal cooking oil by means of Raman spectra technique

A technology of technical identification and Raman spectroscopy, which is applied in the field of rapid food detection, can solve the problems of high detection cost, inaccurate gutter oil qualitative, long test cycle, etc., and achieve the effect of high sensitivity and easy operation

Active Publication Date: 2017-09-08
JILIN UNIV
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Problems solved by technology

Therefore, the detection of these targets is inaccurate for the determination of waste oil; in addition, the detection methods mostly use large-scale instruments, the pre-treatm

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  • Method of identifying illegal cooking oil by means of Raman spectra technique
  • Method of identifying illegal cooking oil by means of Raman spectra technique
  • Method of identifying illegal cooking oil by means of Raman spectra technique

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Embodiment 1

[0021] Preparation of SERS enhancement reagent: 27mg AgNO 3 Dissolve it in 150mL ultrapure water, add 3.0mL sodium citrate aqueous solution with a mass fraction of 1% quickly after boiling, heat to reflux, and keep it for 10min, then cool down to 80°C for 40min, and cool naturally to room temperature to obtain Silver sol of SERS enhancing reagent;

[0022] The detection of capsaicin in waste oil adopts the form of standard substance addition, that is, the method of adding natural capsaicin to simulate the edible oil (i.e. waste oil) detected in qualified edible oil, natural capsaicin is purchased from Aladdin Reagent (CAS No.: 404-86-4; Molecular formula: C18 h 27 NO 3 Molecular weight: 305.41), the structural formula of natural capsaicin is shown in the following formula. The specific operation steps of the standard addition are: use an analytical balance to take 0.0305g of natural capsaicin and dissolve it in 1mL of methanol, and then add it to 99mL of soybean oil to form...

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Abstract

The invention relates to a method of identifying illegal cooking oil by means of a Raman spectra technique and belongs to the technical field of food fast detection. The method comprises the following steps: measuring 2-5mL of edible oil needed to be detected, adding an extraction reagent A double in volume, whirling the mixture for 5-10min and then performing magnetic field assisted separation to extract natural capsaicin from the edible oil; then analyzing the extracted natural capsaicin by using 2-5mL of methanol to obtain a methanol extraction liquid; then adding the methanol extraction liquid into a derived solution B the same in volume, and performing a whirling reaction at room temperature for 1-3min; and finally adding an SERS enhancing reagent C the same in volume to the reaction solution, performing the whirling reaction at room temperature for 1-3min, and performing SERS detection; if characteristic peaks of natural capsaicin are shown in the SERS spectrogram, the detected edible oil is illegal cooking oil. The invention provides a simple, quick and super-sensitive analysis method for identifying illegal cooking oil, which has the characteristics of being distinct in target object, strong in characteristics, accurate in quality and simple in operation.

Description

technical field [0001] The invention belongs to the technical field of rapid food detection, and in particular relates to a method for accurately and rapidly identifying waste oil by using Raman spectrum technology. Background technique [0002] Waste oil: generally refers to all kinds of discarded low-quality edible oils, mainly kitchen waste oils, which are refined after filtration, distillation, and decolorization. There are toxic and harmful ingredients in varying amounts, and long-term or large-scale consumption is extremely harmful to human health. According to incomplete statistics, as many as 3 million tons of gutter oil flow to the dining tables of Chinese people every year in my country, so the identification methods and indicators of gutter oil are also widely concerned by the Chinese people. The reason for the long-term existence of waste oil in China is the high profit return. Compared with normal cooking oil, the profit of waste oil is nearly 2,000 yuan per me...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 徐抒平徐蔚青刘治刚耿乙迦赵冰刘向源孙丹
Owner JILIN UNIV
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