Rapeseed oil is a triglyceride composed of various fatty acids. According to analysis, the average fatty acid composition of various types of rapeseed oil in China is: palmitic acid 2.57%, oleic acid 15.79%, linoleic acid 14.57%, linolenic acid 9.18%, eicosenoic acid 9.41%, erucic acid 48.37% . Oleic acid and linoleic acid are beneficial to the human body. Linoleic acid is beneficial to lower serum cholesterol, and is a component of cell membranes, and plays an important role in the development and wound healing of newborn babies. Linolenic acid contains unsaturated fatty acid with three double bonds, which is easy to oxidize to form aldehydes and ketones, etc., resulting in odor, so it is not suitable for food processing. Erucic acid is a 22-carbon long-chain fatty acid. The human body absorbs Methyl Erucate slowly, and the utilization rate is low. The content of oleic acid and linoleic acid in vegetable oil without Methyl Erucate or low erucic acid is significantly increased. Refined vegetable oil is processed Deep processing can be made into salad oil, shortening, margarine, etc., which are widely used in the food industry.
Methyl Erucate exists in a variety of vegetable oils and some animal oils in the form of glycerides. For example, rapeseed oil in China contains 35-55% Methyl Erucate, and mustard oil contains 40-52%. Sea Brassica contains 59% and kale oil contains 49%. These are good raw materials for extracting Methyl Erucate. Erucic acid in rapeseed oil is a fatty acid, which contains about 20-50% in rapeseed oil. Animal experiments have shown that a large intake of rapeseed oil high in erucic acid can cause fat accumulation in the animal myocardium and exist in the form of triglycerides, which can lead to myocardial fibrosis. The duckling experiment also had similar lesions, and hydropericardium and liver cirrhosis also appeared at the same time. It was also found that long-term feeding of animals with high-Methyl Erucate feed resulted in weight loss and poor growth.
Some people think that the damage of Methyl Erucate to the myocardium is related to the incomplete metabolism of erucate in the body. After animals ingest a large amount of erucate, the organs in the body have no time to completely decompose it, and too much Methyl Erucate will be deposited in the myocardium and other places, causing myocardial disease. But so far, there is no report about cardiomyopathy caused by people eating rapeseed oil. It is believed that this is due to the small amount that people eat, and the human body contains enzymes that decompose Methyl Erucate, so there is no direct evidence that Methyl Erucate is harmful to humans. evidence.
But some people are cautious about this, thinking that eating more rapeseed oil for a long time will produce inconspicuous adverse reactions, such as weight loss and fatigue. Therefore, some countries in the world stipulate that the Methyl Erucate content of edible rapeseed oil shall not exceed 5%, but there is no such regulation in our country.