In addition to looking at the ingredient list, China's national food safety standard General Rules for Nutrition Labeling in prepackaged foods, which was implemented on 20 13 1, stipulates that if the food ingredients contain hydrogenated and/or partially hydrogenated oils, the trans fatty acid content must be indicated in the nutrition ingredient list of the food label. Therefore, when buying packaged food, parents should pay more attention to the nutritional ingredient list on the label if they see the above ingredients in the ingredient list, and they can choose foods without trans fatty acids or with low trans fatty acids content.
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Trans fatty acids and cis isomers have the same composition, bond structure, functional groups and the number of carbon-carbon double bonds, but the spatial relationship between atoms and functional groups in the molecule is different, and the carbon chain conformation is different, so it is not appropriate to say that the carbon chain structure is the same. The spatial conformation of trans isomers is linear, and that of cis structures is curved. For example, cis-oleic acid and trans-oleic acid have different spatial structures.
Because of incomplete hydrogenation, hydrogenated oil still contains carbon-carbon double bonds. During hydrogenation, due to the stability of trans oil, some molecules in the oil are rearranged, and cis-unsaturated oil becomes trans-unsaturated oil. If the conditions of oil hydrogenation reaction are improved, such as high pressure, low temperature and noble metal catalyst, the formation of trans oil can be reduced or avoided.
Baidu encyclopedia-trans fatty acids