Method for detecting adulteration of sesame oil

Abstract

The invention discloses a method for detecting sesame oil adulteration, and relates to the technical field of sesame oil quality monitoring. The method specifically comprises the following steps: adding standard sesame oil into a mixed system prepared by mixing polyphenol dyes and zinc ions for reaction, and recording color change as a standard color; adding a to-be-detected sesame oil sample into a mixed system prepared by mixing polyphenol dyes and zinc ions for reaction, recording color change, and comparing the color change with the standard color; and judging whether the sesame oil is adulterated according to the color difference. According to the invention, based on the coordination effect between Zn<2+> and compounds in the sesame oil, the weak complexing effect between Zn<2+> and polyphenol dyes (alizarin red S, bromo-pyrophenol red, pyrogallol red and catechol purple) can be destroyed, and the color recovery of the polyphenol dyes is realized; and the method is of great significance in protecting health and benefits of consumers, detecting and identifying related departments and maintaining a good market environment.

Description

technical field [0001] The invention relates to the technical field of sesame oil quality monitoring, in particular to a method for detecting adulteration of sesame oil. Background technique [0002] Sesame oil is a vegetable oil with special flavor extracted from sesame, which contains a large amount of active substances such as lignans, vitamin E, and sesamol, and has anti-oxidation, anti-cancer and anti-aging effects. It is loved by people all over the world for its unique aroma and excellent nutritional value. Driven by profit, in recent years, there have been fake and shoddy sesame oil products on the market. In the process of adulteration, cheap vegetable oils are often used to add flavors and colors to mimic real sesame oil. [0003] At present, there are traditional analysis methods such as fatty acid spectroscopy, nuclear magnetic resonance spectroscopy, and chromatography to detect the adulteration of sesame oil at home and abroad. These analysis methods have hig...

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Problems solved by technology

[0003] At present, there are traditional analysis methods such as fatty acid spectroscopy, nuclear magnetic resonance spectroscopy, and chromatography to detect the adulteration of sesame oil at home and abroad. These analysis methods have high accuracy and reliability, but they need to rely on expensive equipment and strict experiments. The room conditions, sample processing is not only complicated, but also the analysis speed is very slow, which cannot meet the needs of rapid detection in the market

The traditional fluorescence spectrum analysis method has the advantages of high sensitivity, quantitative accuracy, and less sampling volume in the qualitative analysis of edible vegetable oils, and some research results have been achieved in this area at home and abroad, but the fluorescence spectrum peaks of edible vegetable oils have overlapping defects. A lot of fluorescence information is hidden in the main peak, which increases the difficulty of analyzing the fluorescence spectrum

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