A method for rapid screening of adulterated waste oil in edible oil using low-field nuclear magnetic resonance

Abstract

The invention discloses a method for quickly screening adulterated waste oil in edible oil by using low-field nuclear magnetic resonance. got a T 2 Transverse relaxation time spectrum information is used as the basis for principal component analysis, which can quickly determine whether the oil sample to be tested has waste oil adulteration through the relative position of the sample to be tested on the PCA map, and further through the characteristic parameter value and adulteration The ratio builds a prediction model, and the adulteration ratio in the oil sample to be tested can be calculated through the prediction model. Based on the method provided by the present invention, the identification of waste oil adulterated various edible oils can be realized through the replacement of different qualified edible oil samples, and the selection of low-field nuclear magnetic analyzers of different models and specifications can satisfy waste oil and its The on-site rapid detection of adulterated oil samples and the demand for low detection limit and high sensitivity detection provide an effective solution for the analysis and identification of different occasions and conditions.

Description

technical field [0001] The invention belongs to the field of food detection and relates to a method for quickly screening adulterated waste oil in edible oil by using low-field nuclear magnetic resonance. Background technique [0002] Waste oil generally refers to all kinds of low-quality oils that exist in daily life. According to its source, it can be divided into waste oil (kitchen waste) in a narrow sense, low-quality animal fats and old frying oil. [0003] Compared with normal cooking oil, although the main component of gutter oil is still triglyceride, due to long-term air exposure and high temperature treatment, the oil undergoes a series of hydrolysis, oxidative rancidity and thermal polymerization reactions to generate some aldehydes, Small molecular substances such as ketones and acids lead to deterioration of flavor, and at the same time, some hydroxides and free radicals are produced, which can aggravate human aging and induce tumors and other diseases, and also...

AI Technical Summary

Problems solved by technology

This method satisfies the qualitative and quantitative analysis of a type of waste oil by using the characteristic small peak of frying old oil, fully embodies the characteristics of low-field NMR in oil analysis, which is simple and fast, and does not require the use of chemical reagents, etc. It is difficult to identify oil samples that still have relaxation signals at the same relaxation time and other types of waste oil without this characteristic peak

The main reason is that the mining and characterization methods of multi-feature signals of pure edible oil, pure waste oil and mixed oil are insufficient, and it is urgent to develop a new multi-feature signal rapid identification method for edible oil adulteration

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