NE224 Lecture Notes - Lecture 12: Solvent, Biological Membrane, Chief Operating Officer
9 Oct 2014
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Document Summary
Lipid structures fatty acid/lipid types biological membrane structure: lipids, membrane proteins. Generally water-insoluble, organic solvent soluble: fatty acids. Length of chain: 12-24 carbons, usually even # of c. Unsaturation: if more than 1 double bond, the c=c are usually not conjugated to each other e. g. -comparison of melting temperatures of saturated (no c=c) and unsaturated (contain c=c) fatty acids: increasing length of chain increases mp. The common biological fatty acids: increasing # of c=c decreases mp. Lipids and membranes p3 of 16: storage lipids: triacylglycerols. 3 fatty acids esterified to a glycerol molecule: 2 or 3 different fatty acids: mixed triacylglycerol. Lipids and membranes p4 of 16 alkyl chains are highly reduced oxidation energy take up relatively little space. Triacylglycerols can be hydrolyzed by enzymes (called lipases) or reactions with base, note the similarity to the protease reaction: Lipase reaction generates 3 fatty acids + glycerol. Saponification with base generates fatty acid salts to make soaps (+ glycerol)
