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

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...

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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-treatment is complicated, the detection cost is high, and the test cycle is long: such as using HPLC-MS to detect some inorganic salts, fatty acids, and capsaicin. waiting for testing

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