11-Fats _ Oils-12

fat soluble vitamins a d e k adipose essential

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Unformatted text preview: need ! For further reading, see McGee ! Probably the best known are the prostaglandins (seen in next slide) FST10 ©GMS/GFR 2012 FST10 ©GMS/GFR 2012 Roles of fats Prostaglandins ! Energy source Texture ! Adipose ! ! Essential fatty acids ! Fat soluble vitamins: A, D, E, K ! FST10 ©GMS/GFR 2012 This topic is for nutrition classes… FST10 ©GMS/GFR 2012 Roles of fats ! Energy source Texture Adipose Essential fatty acids Fat soluble vitamins: A, D, E, K ! Roles of fats — Flavor Flavor and flavorings ! ! ! ! ! ! 1-Storage of flavor compounds 3 effects follow on the next 3 slides… FST10 ©GMS/GFR 2012 FST10 ©GMS/GFR 2012 Roles of fats — Flavor ! ! Roles of fats — Flavor 1-Storage of flavor compounds 2-Specific for a product ( e.g. butter ) ! ! ! 1-Storage of flavor compounds 2-Specific for a product ( e.g. butter ) 3-Without fat - flavor is a problem (“Ain!t Nothin! good without the grease” - Tina Turner) ! FST10 ©GMS/GFR 2012 FST10 ©GMS/GFR 2012 Roles of fats ! ! Roles of fats: heat transfer Energy source Texture ! ! Fat soluble vitamins: A, D, E, K ! ! Adipose Essential fatty acids Flavor and flavorings ! ! ! Heat transfer ! FST10 ©GMS/GFR 2012 Large molecules do not evaporate Can be heated to very high temperatures Heat transfer with hot fat is called: frying FST10 ©GMS/GFR 2012 Fats, Double Bonds & Saturation (everything you were afraid to ask) ! The world!s shortest (and oversimplified) explanation of double bonds, saturation and unsaturation follows ... HH HH HCCH HCCH HH Ethylene Double Bond Ethane Single Bond FST10 ©GMS/GFR 2012 FST10 ©GMS/GFR 2012 See also McGee C-18 Fatty Acids COOH 18:0 — Stearic Acid COOH 18:1 — Oleic Acid COOH 18:2 — Linoleic Acid COOH 18:3 — Linolenic Acid OMEGA numbers & saturation What’s with the OMEGA numbers? ! Nutritionists are interested in the end of the molecule farthest from the acid group ! So the “last carbon” is like the last letter of the Greek alphabet — $ ! They number in from the (omega) end until they come to the 1st double bond ! C-18 Fatty Acids Nutritionists are interested in the proportions of the fatty acid types ! COOH COOH COOH Saturated 18:2 — Linoleic Acid COOH Monounsaturated ! 18:1 — Oleic Acid Polyunsaturated ! 18:0 — Stearic Acid $9 18:3 — Linolenic Acid $6 $3 FST10 ©GMS/GFR 2012 OMEGA numbers & saturation ! FST10 ©GMS/GFR 2012 OMEGA numbers & saturation Nutritionists are interested in the proportions of the fatty acid types ! ! ! Polyunsaturated Monounsaturated Saturated FST10 ©GMS/GFR 2012 FST10 ©GMS/GFR 2012 But we do need to know a little more about Fatty acid stuff — Too advanced for FST10 (Don’t write these down; these are just in case you read something about them like the label below...) ! Chemists locate double bonds from the acid end & use the Greek symbol delta (%) ! Some biochemists & nutritionists use lower case “n” instead of $; well sort of... ! Things like ALA are different from GLA ! There are weird th...
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This note was uploaded on 09/28/2012 for the course FST 10 taught by Professor Jack during the Spring '08 term at UC Davis.

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