ch369_sp11_lipids_notes - Todays topic - Lipids & membranes...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Lipid . Definition = A substance that is relatively insoluble in water, and can be extracted from a cell with a non-polar solvent. Some lipids: Fatty acids . Triacylglycerols . Phospholipids . Cholesterol . Vitamins A,D,E,K . Sphingolipids. Today’s topic - Lipids & membranes (Chapter 8) .
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Fatty acids (FAs). Fatty acid Carboxylic acids with chains of varying lengths. 12 to 24 carbons are common, usually even numbers. pKa is about 4, so negative charge at physiological pH. Fatty acid
Background image of page 2
Some common saturated fatty acids. ( saturated means no double bonds in carbon chain). stearate Laurate, 12 carbons. Myristate, 14 carbons. Palmitate, 16 carbons. Stearate, 18 carbons. Arachinate, 20 carbons.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Some common unsaturated fatty acids. Linoleate (or linoleic acid), a polyunsaturated fatty acid. Oleate (or oleic acid), an unsaturated fatty acid. Notice the numbering system (carboxylate carbon is #1)
Background image of page 4
Unsaturated fatty acids can be either cis or trans isomer around double bond. Most naturally occurring fatty acids are cis . Cis have lower melting point than trans (trans FA’s pack together better, tend to form solids).
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Triacylglycerols (TAGs). Fatty acid (TAG) (FA)
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Tristearin (a simple triacylglycerol).
Background image of page 8
Triacylglycerols can have mixed acyl chains.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
solidifies easily. acyl chains are more liquid.
Background image of page 10
FAs and TAGs store a lot of energy in a small volume .
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/20/2011 for the course CHEM 369 taught by Professor Hoffman during the Spring '11 term at University of Texas at Austin.

Page1 / 34

ch369_sp11_lipids_notes - Todays topic - Lipids & membranes...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online