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Hydrogen. The process is called hydrogenation.
Hydrogenation refers to an enzymatic chemical reaction between molecular hydrogen (H2) and another substance. Its product is a saturated organic compound.
The process called "hydrogenation" adds chemical bonds within the oil to decrease the number of double carbon bonds, changing the fat from unsaturated (fewer hydrogen bonds) to saturated (more hydrogen bonds).Saturated fats tend to be solids.
Trans Fats
Trans fats
Trans Fats
Hydrogenated oils are made from liquid vegetable or seed oils and are created to mimic saturated fats. Saturated fats are those that are solid at room temperature. Hydrogenation, the process of polymerizing liquid fats[oils] by heating and injecting hydrogen gas into them, creates "trans-fats", or solid "plasticated" fats which we now know, (or are told), are worse for us than the saturated fats they were designed to replace. ANY fats that are solid at room temperature are either saturated fats or trans-fats.
Organic molecules consist mainly of carbon, hydrogen, and (often) oxygen atoms. Saturated fats refer to those fats whose molecules contain all the hydrogen atoms they can. Unsaturated fats contain some double bonds between some of the carbons instead. Hydrogenation breaks the double bonds, making two single bonds for each carbon; one of those will stay between the carbons, and the others will attach to hydrogen atoms supplied from some other substance. A very simple example would be ethane: H3C-CH3, which is saturated, and ethene: H2C=CH2, which is unsaturated. By breaking one of the two carbon-carbon bonds and substituting hydrogen atoms, the ethene will convert to ethane.
Saturated fats and trans-fats are solid at room temperature. Polyunsaturated and monounsaturated fats (oils) are liquid at room temperature. Trans-fats are liquid fats that are treated chemically and thermally to mimic saturated fats, usually in a process called hydrogenation. This process in a nutshell (it's a bit more complicated) injects hydrogen into the oils at high temperature and high pressure producing polymers (plastics) from the hydrocarbon molecules in the oils. Most vegetable shortenings are produced this way, shortenings (solid fats) that are not natural saturated fats are trans-fats.
The chemical process in which hydrogen atoms are added to unsaturated and polyunsaturated fats is hydrogenation.
Margarine is produced by emulsification of skim milk into vegetable oil. It is done by adding monoglycerides and diglycerides (which are emulsifiers) to the mixture of oil and water. The mixture is then mixed very rapidly, and cooled at the same time. At the end, the vegetable oil will solidify partly and trap water molecules inside.
olive and canola oils are examples of saturated fats