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Saturated fatty acids 16 and 18 carbons in length are the dominant types in the epidermis, [39] [40] while unsaturated fatty acids and saturated fatty acids of various other lengths are also present. [39] [40] The relative abundance of the different fatty acids in the epidermis is dependent on the body site the skin is covering. [40]
A saturated fat is a type of fat in which the fatty acid chains have all single bonds between the carbon atoms. A fat known as a glyceride is made of two kinds of smaller molecules: a short glycerol backbone and fatty acids that each contain a long linear or branched chain of carbon (C) atoms.
Tetradecanoic acid CH 3 (CH 2) 12 COOH C14:0 Pentadecylic acid: Pentadecanoic acid CH 3 (CH 2) 13 COOH C15:0 Palmitic acid: Hexadecanoic acid CH 3 (CH 2) 14 COOH C16:0 Margaric acid: Heptadecanoic acid CH 3 (CH 2) 15 COOH C17:0 Stearic acid: Octadecanoic acid CH 3 (CH 2) 16 COOH C18:0 Nonadecylic acid: Nonadecanoic acid CH 3 (CH 2) 17 COOH C19 ...
Examples of unsaturated fatty acids are palmitoleic acid, oleic acid, myristoleic acid, linoleic acid, and arachidonic acid. Foods containing unsaturated fats include avocado, nuts, olive oils, and vegetable oils such as canola. Meat products contain both saturated and unsaturated fats.
Saturated fat has a predominance of saturated fatty acids, without any double bonds, while unsaturated fat has predominantly unsaturated acids with double bonds. (The names refer to the fact that each double bond means two fewer hydrogen atoms in the chemical formula.
Cervonic acid (or docosahexaenoic acid) has 22 carbons, is found in fish oil, is a 4,7,10,13,16,19-hexa unsaturated fatty acid. In the human body its generation depends on consumption of omega 3 essential fatty acids (e.g., ALA or EPA), but the conversion process is inefficient. [ 22 ]
Polyunsaturated fatty acids are precursors to and are derived from polyunsaturated fats, which include drying oils. [3] Chemical structure of the polyunsaturated fatty acid linoleic acid 3D representation of linoleic acid in a bent conformation Chemical structure of α-linolenic acid (ALA), an essential omega−3 fatty acid
Chemical structure of eicosapentaenoic acid (EPA) Chemical structure of docosahexaenoic acid (DHA) An omega−3 fatty acid is a fatty acid with multiple double bonds, where the first double bond is between the third and fourth carbon atoms from the end of the carbon atom chain. "Short-chain" omega−3 fatty acids have a chain of 18 carbon atoms ...