Lipids/Cell Membrane Flashcards
(157 cards)
Property of lipids
Heterogeneous group of compounds, share: 1. Insolubility in water based solutions. 2. Solubility in organic/non-polar solvent.s

Normal saturated fatty acids are generally more soluble in __?
Chloroform
SA FA are generally less soluble in __ ?
Acetonitrile
5 Biological Functions of Lipids?
Storage of Energy Membrane Structure Signalling Molecules Cofactors for enzymes Antioxidants
Branch 1 Classification of Lipid
Complex and Biologically Active Lipids
Difference between Complex and Biologically Active Lipids
Complex = FA Biologically active = NO FA
Branches of complex lipids (FA)?
Storage and Structural Lipids
Difference between storage and structural lipids?
Storage = non-polar Structural = polar
examples of storage (non-polar) lipids
Triglycerides Waxes
examples of structural (polar) lipids
Phospholipids Sphingolipids
Examples of biologically active lipids (No FA)
Prostaglandins Steroids
Define fatty acid
Amphipathic molecules with hydrocarbon chains containing 3 to 35 carbons plus carboxylic group.
pKa of COOH groups?
<5 … therefore will be fully ionized after this time.
Almost all natural FA have ____
an even # of carbons
FA can be ___
saturated or unsaturated
What are FA physical properties based on?
1) Length of hydrocarbon chain 2) Degree of saturation
All naturally occurring double bonds have __
CIS configuration
Most common FA length?
C14 to C18
What is interesting about the 4 carbon FA, or butanoic acid?
-infinitely water soluble -solubility decreases w/ increased hydrocarbon chain length.
Solubility of Lauric acid? (12 carbon FA?)
partially soluble to the extent of 0.06g per gram of water
Fatty acids with C10 or greater form ___ at room temp
Waxy solids
Fatty acids with C9 or lower saturates or unsaturated HC chains form ___ at room temperature?
Oily solids
What does the prefix “alpha” indicate?
Normal or unbranched structure. i.e alpha-linolenic acid.
Double bonds in FA chains produce what?
kinks and bends
