Hydrogenation is a process which hardens a liquid fat by converting a unsaturated fatty acid components to their saturated form. Unsaturated vegetable oils such as cottonseed, corn, soyabean, etc. are treated with hydrogen to produce a plastic fat for cooking purposes or to resemble and substitute a table fat like butter and ghee. Vanaspati and margarine sold in the market are examples of hydrogenated fats.
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