Week 7 Flashcards
What do all lipids have in common?
They are all hydrophobic
What are the function of triacylglycerols?
Energy storage
What are the function of phospholipids and sterols?
Structural elements of biological membranes
What are glycolipids?
Contain both sugar and lipid portions
Important for cell membrane
What are lipoproteins?
Plasma Lipoproteins that are associated with CVD
What are fatty acids?
Carboxylic acid with hydrocarbon chain
What is a saturated fatty acid?
No double bonds
Saturated with Hydrogen
What is the function of fatty acids?
Building blocks of many complex lipids
Central intermediates in metabolism
Free fatty acids are present in trance amounts
What are some common features of fatty acids?
Even number of carbon atoms
Are unbranched
Cis configuration
What kind of structure are PUFA fatty acids in?
Methylene-bridged not conjugated
Double-single-double-single
What are the commonly occurring saturated fatty acids?
Laurate myristate Palmitate Stearate Arachidate
Laurate
12
Myristate
14
Palmitate
16
Stearate
18
Arachidate
20
What form does saturated fatty acids adopt?
Extended conformations
ZIg-Zag
What happens if chain length increases?
Melting point increases
Solubility decreases
What are the melting points of unsaturated fatty acids?
Lower than saturated fatty acids due to cis bond which creates a kink in the molecule
What is the relationship between double bonds and melting point?
The more the double bonds, the lower the melting temperature
What is partial hydrogenation?
Hydrogenating a double bonded substance so it has less double bonds
What does partial hydrogenation do to unsaturated fatty acids?
Trans double bonds which allows fatty acids to adopt an extended conformation
What is the melting point of trans fatty acids?
Higher than Cis forms
Carboxylic acids + Alcohol
Esters
