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Fat undergoes digestion by Pancreatic enzyme 'Lipase'. For that bile salt helps in emulsification of Fat, so that very large surface area is created for action of enzyme. Fats are splits into Glycerol and Fatty acids like Palmitic acid (16 carbons chain.),Strearic acid (18 carbon chain.) and Arachidonic acid (20 carbon chain.). And then absorbed in small intestine.
From proteins you get amine acids. In nature over 300 amine acids are found. But in human body you have only 20 of them.( Lysine, Leucine, Isoleucine,**** Methio-nine, Threonine, Phenil-alanine,Tryptophan, Va-line, Arginine and Histidine are essential amine acids. (They have to be taken in food.) Others are Glycine,(most simple.) Pro-line, Alanine,(see above.)Tyro-sine, Serine, Cysteine, **Glut-amine and Glutamic acid,**Asparagine and Aspartic acid. They are non-essential.(Means body can get them converted into from other amine acids. 2) Glucose, Fructose and Ga-lactose from carbohydrates. 3) Fatty acids from fats like Strearic acid (16 carbons.) , Palmitic acid (18 carbons.) and Arachidonic acids.(20 Carbons.) 4) Glycerol, a molecule having three arms to which three Fatty acids are attached.
Soaps being detergent in nature, consist mainly of sodium hydroxide and fatty acids (glycerol). Thus, they are expected to constitute of sodium (Na) oxygen (O) hydrogen (H) carbon (C); in addition to other ingredients or impurities