Lect1210f

Lect1210f - Chemistry 83 10/14/10 Biochemistry Systematic...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Chemistry 83 10/14/10 1 Biochemistry Systematic study of the molecular nature of life processes Second type of biochemical substance is the lipid • Lipids are non-polar substances that are insoluble in water but soluble in non- polar solvents • Proposed abiotic production of lipids involves removal of OH groups from sugars in a complex series of steps • Examples of lipids: fats and oils, fatty acids, waxes, phospholipids, steroids, and some vitamins
Background image of page 1

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

View Full DocumentRight Arrow Icon
Chemistry 83 10/14/10 2 http://www.ilri.org/InfoServ/Webpub/Fulldocs/ILCA_Manual4/images/FIG%204%20P10.gif Fatty acids have long non-polar chains and are components of fats Saturated fatty acid - all single C to C bonds Mono-unsaturated fatty acid - one C to C double bond Poly-unsaturated fatty acid: more than one C=C double bond Omega-3 unsaturated fatty acid: C=C after 3rd C atom Notation: C(total # of C atoms in acid : # of C=C in chain) http://www.chem1.com/acad/webtext/states/polymerimages/cis_trans.png Double bonds make two isomers possible Cis-isomer : like groups (here H) on adjacent C atoms are both above or both below the double bond. Trans-isomer : like groups on adjacent C atoms are across from each other - one above and one below the double bond.
Background image of page 2
Chemistry 83 10/14/10 3 Oleic acid http://www.myfoodforhealth.com/fats.htm#Fatty%20Acid%20Con±gurations A cis-double bond bends the carbon chain of a fatty acid O OH Cis C18:1 (one cis double bond) Elaidic acid http://www.myfoodforhealth.com/fats.htm#Fatty%20Acid%20Con±gurations O OH A trans-double bond does not bend the carbon chain of a fatty acid Trans C18:1 (one trans double bond)
Background image of page 3

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

View Full DocumentRight Arrow Icon
Chemistry 83 10/14/10 4 Joesten, World of Chemistry: Essentials, Saunders FL, 1993, 210 Three fatty acids react with the triple alcohol, glycerol, by dehydration to produce a triple ester called a fat. Triple ester Triple alcohol Fats are lipids that have three fatty acids linked to one glycerol molecule (triple ester or triglyceride) Replacing O-H bonds of sugars with C-H bonds makes fats insoluble in water, but greatly
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/19/2010 for the course CHEM 83 taught by Professor Bonk,j during the Fall '08 term at Duke.

Page1 / 15

Lect1210f - Chemistry 83 10/14/10 Biochemistry Systematic...

This preview shows document pages 1 - 5. Sign up to view the full document.

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