Method for detecting purity of soybean oil-doped sesame oil

Abstract

The invention relates to a method for detecting purity of soybean oil-doped sesame oil. The method comprises the following steps: firstly, measuring raman spectrum graphs of pure sesame oil and soybean oil, respectively confirming the characteristic peaks of the components at 1500-1800cm<-1> and calculating the peak areas Sx and Sd and peak heights Hx and Hd of the characteristic peaks within the wave band of 1500-1800cm<-1>; preparing the sesame oil doped with 1%, 5%, 10%, 15%, 20% and 25% soybean oil, determining the raman spectrum graphs in each sample and respectively determining the peak areas and peak heights of the characteristic peaks at 1500-1800cm<-1>; fitting a relation expression between a ratio S of the peak area square meter to the peak height S / H and the doping concentration C of the soybean oil to acquire S / H=A*(1+C)2+B, wherein C is more than 0 but less than 1, A=1.18 and B=7.04; adopting a laser light source in same wavelength for measuring the raman spectrum graph of a to-be-measured sesame oil sample, confirming the characteristic peak thereof at 1500-1800cm<-1>, measuring the peak area Ss and peak height Hs thereof to acquire the ratio Ss / Hs of the peak area to the peak height; substituting the acquired result to the formula acquired in step 3), calculating and acquiring the purity of the measured sesame oil sample.

Description

Technical field: [0001] The application relates to the field of oil detection, especially the detection of the purity of sesame oil mixed with soybean oil. Background technique: [0002] Commonly used edible vegetable oils include corn oil, peanut oil, soybean oil, camellia oil, rapeseed oil, sunflower oil and sesame oil, etc. The ingredients contained are complex, but they all contain various nutrients such as fatty acids and vitamins, which are important for human diet. component. In the metabolic cycle, in addition to providing energy, it also provides some nutrients that the human body cannot synthesize by itself, such as unsaturated fatty acids and fat-soluble vitamins. Among them, sesame oil is the most precious edible oil among many vegetable oils. Sesame oil is deeply loved by people because of its unique fragrance and taste. It is also the most expensive oil. [0003] Because of the low output and high price of sesame oil, there are illegal operators in the marke...

AI Technical Summary

Problems solved by technology

[0005] At present, the more common methods for detecting the fatty acid content of edible vegetable oils include gas chromatography (GC), gas chromatography-mass spectrometry (GC-MS), and high-performance liquid chromatography (HPLC), etc., but these methods are all chemical analysis methods. , the operation of the equipment used is relatively complicated, and the samples to be tested need to be pretreated, and the detection takes a long time, which is not conducive to popularization

Images