NUTR-UE 119 Lecture Notes - Lecture 4: Smoke Point, Pancreatic Lipase Family, Polyunsaturated Fat
25 Aug 2016
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Document Summary
Lipids: lipids are a family of organic compounds soluble in organic solvents not water, three classes: 1. 2 fatty acids + glycerol + phosphorus containing molecule. Emulsifier: polar phosphorus containing group of the phospholipid can interact with water. Key component of cell membranes called phospholipid bilayers. Facilitates the movement of lipids across cell membranes between watery fluid on both sides. Water/ water soluble compounds less able to diffuse across, creating compartments. Lecithin is an example of a phospholipid molecules (high amounts in flax seeds and eggs: sterols: large molecules with carbon rings that are interconnected, often acting as hormones. Fatty acids + hydrocarbon chains with a carboxylic acid end (cooh) and a methyl end (ch3) differ from one another in chain length (c) and degree of saturation. Include a mixture of fatty acids: the type that predominates determines whether it is a liquid fat (oil) or solid fat (butter, lard) and temp at which it melts.
