lecture13 - Lipids Lipids Lipids: a group of non-polar...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Lipids Lipids Lipids: Lipids: a group of non-polar organic compounds that are insoluble in water, primary components soluble in organic solvents including diethyl ether, chloroform, methylene chloride, and acetone Lipids include: Open chain compounds : have polar head groups and long non-polar tails fatty acids, triacylglycerols, sphingolipids, phosphoacylglycerols, glycolipids, Fused-ring compounds : cholesterol, steroid hormones, and bile acids
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 Fatty Acids Fatty acid Fatty acid : : amphipathic compound- has a carboxyl group that is polar and a hydrocarbon chain that is nonpolar. an unbranched carboxylic acid and tail, most commonly of 12 - 20 carbons can be unsaturated (has C-C double bonds), or saturated (no double bonds) double bond can be in either cis or trans orientation cis bonds make the fatty acid kinked trans bonds keep the FA straight fatty acids are written as the number of carbons and the number of double bonds in the chain separated by a colon (e.g. 16:2, 16 C with 2 double bonds)
Background image of page 2
saturated FA unsaturated FA ( trans ) unsaturated FA ( cis ) Fatty Acids cont. Fatty Acids cont.
Background image of page 3

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

View Full DocumentRight Arrow Icon
Fatty Acids Fatty Acids Among the fatty acids most abundant in plants and animals nearly all have an even number of carbon atoms, most between 12 and 20, in an unbranched chain the three most abundant are palmitic (16:0), stearic (18:0), and oleic (18:1) acids in most unsaturated fatty acids, the cis isomer predominates; the trans isomer is more rare unsaturated fatty acids have lower melting points than their saturated counterparts; the greater the degree of unsaturation, the lower the melting point
Background image of page 4
Fatty Acids Fatty Acids 20:4 18:3 18:2 18:1 16:1 20:0 18:0 16:0 14:0 12:0 Carbon Atoms/ Double Bonds mp (¡C) Common  Name -49 -11 -5 16 -0.5 77 71 63 58 44 arachidonic acid linolenic acid linoleic acid oleic acid palmitoleic acid arachidic acid stearic acid palmitic acid myristic acid lauric acid High melting point Low melting point
Background image of page 5

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

View Full DocumentRight Arrow Icon
Triacylglycerols Triacylglycerols Triacylglycerol (triglyceride) Triacylglycerol (triglyceride) : : an ester (polar) of glycerol with three fatty acid tails (non-polar)
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 24

lecture13 - Lipids Lipids Lipids: a group of non-polar...

This preview shows document pages 1 - 7. Sign up to view the full document.

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