Very comprehensive nutritional data resource
A VERY extensive nutritional data site - almost a tempatation of too much information for those with any tendancy to want to know everyting!
BUT a great way to answer specific questions - settle discussions! A potentially hugely useful site. RB http://www.nutritiondata.com/fatty-acids.html Abstract Fatty Acids Nutritionists commonly classify dietary fat as either saturated, monounsaturated, or polyunsaturated, based on the number of double bonds that exist in the fat's molecular structure. For each of these three classes, there exists a large number of different chemical variations or "isomers". For reason of clarity, ND refers to each fatty acid isomer by it's numerical designation. The first number of this designation indicates how many carbon atoms are in the fatty acid molecule, and the number after the colon indicates the number of double bonds. Omega-3 and omega-6 isomers include "n-3" and "n-6" markings, and the letters c and t are used to indicate whether the double bonds are in cis or trans configurations. Many fatty acids also have systematic (non-numerical) names, as well as common names, which leads to some confusion in identifying them. To help make it easier to understand, we've prepared the table below, which puts all of the equivalent names together in one place. Fatty Acid Equivalent Names Type Isomer Systematic Name Common Name Saturated Fats 4:0 butanoic acid butyric acid 6:0 hexanoic acid caproic acid 8:0 octanoic acid caprylic acid 10:0 decanoic acid capric acid 12:0 dodecanoic acid lauric acid 13:0 tridecanoic acid 14:0 tetradecanoic acid myristic acid 15:0 pentadecanoic acid 16:0 hexadecanoic acid palmitic acid 17:0 heptadecanoic acid margaric acid 18:0 octadecanoic acid stearic acid 19:0 nonadecanoic acid 20:0 eicosanoic acid arachidic acid 22:0 docosanoic acid behenic acid 24:0 tetracosanoic acid lignoceric acid Type Isomer Systematic Name Common Name Monounsaturated Fats 14:1 tetradecenoic acid myristoleic acid 15:1 pentadecenoic acid 16:1 undifferentiated hexadecenoic acid palmitoleic acid 16:1 c 16:1 t 17:1 heptadecenoic acid 18:1 undifferentiated octadecenoic acid oleic acid 18:1 c 18:1 t 20:1 eicosenoic acid gadoleic acid 22:1 undifferentiated docosenoic acid erucic acid 22:1 c 22:1 t 24:1 c cis-tetracosenoic acid nervonic acid Type Isomer Systematic Name Common Name Polyunsaturated Fats 16:2 undifferentiated hexadecadienoic acid 18:2 undifferentiated octadecadienoic acid linoleic acid 18:2 n-6 c,c 18:2 c,t 18:2 t,c 18:2 t,t 18:2 i 18:2 t not further defined 18:3 octadecatrienoic acid linolenic acid 18:3 n-3 c,c,c alpha-linolenic acid 18:3 n-6 c,c,c gamma-linolenic acid 18:4 undifferentiated octadecatetraenoic acid parinaric acid 20:2 n-6 c,c eicosadienoic acid 20:3 undifferentiated eicosatrienoic acid 20:3 n-3 20:3 n-6 20:4 undifferentiated eicosatetraenoic acid arachidonic acid 20:4 n-3 20:4 n-6 20:5 n-3 eicosapentaenoic acid (EPA) timnodonic acid 22:2 docosadienoic acid brassic acid 22:5 n-3 docosapentaenoic acid (DPA) clupanodonic acid 22:6 n-3 docosahexaenoic acid (DHA) |
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