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Lecture

11-15-12 chapter 15.docx

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School
Boston College
Department
Chemistry
Course
CHEM 1161
Professor
Schlegel
Semester
Fall

Description
Chapter 15 Lipids  11/15/2012 15.1 Lipids  Lipids biomolecules that  contain fatty acids (acid and fat in same molecule) or a steroid  nucleus • • •   soluble in organic solvents, but not in water • •   typically extracted from cells using organic solvents • •   an important feature in cell membranes, fat­soluble vitamins, and steroid hormones • •   Many different types of lipids – fatty acids, waxes, triacylglycerols, glycerophospholipids General Structure of Lipids 13 Chemistry: An Introduction to General, Organic, and BiologCopyright © 2012 by Pearson Education, Inc. • waxes= esters of fatty acids  15.2 Fatty Acids  • Fatty acids are • •   long­chain carboxylic acids • •   typically 12–18 carbon atoms insoluble in water saturated (has all the hydrogens it could, no double bonds) or unsaturated (whether the carbon chain on  the end has double bonds or not) Saturated and Unsaturated Fatty Acids 16 Fatty acids can be O • saturated, with all single C–C bonds OH coconut oil, saturated fatty acid • monounsaturated, with one double C=C bond • polyunsaturated, with more than one double C=C bond O OH palmitoleic acid, found in butter monounsaturated fatty acid Chemistry: An Introduction to General, Organic,Copyright © 2012 by Pearson Education, Inc. cis double bonds instead of trans  Properties of Saturated Fatty Acids 17 Saturated fatty acids • contain only single C–C bonds and fit close together in a regular pattern • have strong attractions between long carbon chains – what type of attractive forces are they?? • have higher melting points and are usually solids at room temperature O O OH O OH OH Chemistry: An Introduction to General, Organic, anCopyright © 2012 by Pearson Education, Inc. attractive forc
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