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Study on Fatty Acids Fingerprint and Indentificationn Method of Adulteration in Vegetable Oils

Author: TangFang
Tutor: WuWeiGuo
School: Hunan Agricultural University
Course: Of Food Science
Keywords: Vegetable oils and fats Methyl esterification Similarity Standard fingerprint Adulterated oil
CLC: R155
Type: Master's thesis
Year: 2011
Downloads: 131
Quote: 2
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Abstract

There are some differences due to the nutritional value of the vegetable fats and oils, the uneven distribution of yield and oil and other factors, the price of the plant oils. Some unscrupulous operators just for the sake of high profits, use of illegal means of high-priced oil mixed with cheap oil. This greatly harm the interests of consumers. Need to be taken in order to rectify and standardize the edible oil market, the means of identification grease adulteration, to facilitate favorable against a commercially available grease adulteration. In this paper, GC-MS to establish a standard fingerprint, and fatty acids. Conduct the intuitive comparative analysis and similarity analysis, to qualitatively identify vegetable fats and oils, provide the basis for the establishment of vegetable fats and oils adulteration model. The main findings of the paper are as follows: 1. Using KOH-methanol solution of methyl esterification method and H2SO4-methanol solution of methyl esterification method of vegetable oil fatty acids GC-MS analysis of methyl esterification pretreatment by single factor test and orthogonal test investigated in the content of the methanol solution of KOH-methanol solution of methyl esterification method and H2SO4-methanol solution of methyl esterification method, shaking time, shaking the influence of temperature on the conversion efficiency of methyl oleate, to determine the KOH-methanol solution of methyl ester of the law and the optimum H2SO4-methanol solution of methyl law esterified. Combine these two approaches derivative showing pH binding assay, three methods to the degree of methyl esterification of the method of the methyl esterification, and ultimately determine the best way the binding assay for the pH, the efficiency of the conversion of methyl oleate 95.5 %. 2 using the average vector and direct selection method to establish standard fingerprint seven vegetable oil fatty acids, palm oil and sunflower oil, rapeseed oil, soybean oil, peanut oil, cottonseed oil, and tea seed oil using the average vector method adopted because The sample varies directly taken typical fingerprint, rapeseed oil, soybean oil, peanut oil, cottonseed oil, tea seed oil, palm oil and sunflower oil. Rapeseed oil, soya bean oil, cottonseed oil, peanut oil, and tea seed standard fingerprint created by the average vector method requires calculating similarity, and each corresponding to all samples of the grease similarity greater than 0.998,0.976,0.997,0.998, 0.996, indicating the average vector method to establish the standard fingerprint to better reflect the integrity of each grease. Calculate the similarity between all oil fatty acid standard fingerprint, each grease standard fingerprint differences between, all standard fingerprint to better reflect the integrity of the differences between each grease. At the same time, the fatty acid composition and content of the seven grease standard fingerprint found peanut oil containing insect waxes acid and peanut oil, wood tar acid and behenic acid content is high compared to other oils and fats; rapeseed oil containing nerve acid and α - content of linolenic acid methyl ester content compared to other oils. 3 using the similarity analysis method on plant adulterated oil Recognition Method, cheap oil is incorporated into a different gradient of 5%, 15%, 25%, 50%, etc. High Oil Simulation grease adulteration, calculated for each doped The similarity between the fake fats and all standard fingerprint with the similarity between the oil standard fingerprint, can be qualitatively identify oil adulteration. Using the the intuitive comparative analysis method the adulterated oil Recognition Method plants, with the characteristics of plant oils, cis-oleic / cis-linoleic acid methyl ester and palmitic acid / stearic acid methyl ester, drawing two-dimensional Figure intuitive comparative analysis identified qualitatively grease adulteration.

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