Dietary From:

Triglyceride (TG): glycerol + 3 fatty acids

Di-: glycerol + 2 fatty acids

Mono-: glycerol + 1 fatty acid

Phospho-: glyceride + 2 fatty acids + phosphate

Glyco-: CHO group

Sulfo-: SO4

Lipoprotein: contains protein

1. low density lipoprotein (LDL) = ­ lipid, ¯ protein (bad cholesterol)

2. high density lipoprotein (HDL) = ¯ lipid, ­ protein (good cholesterol)

Other Lipds

Waxes: esters of fatty acids and long chain alcholos

Steroids: insoluble in water

*basic structure

Cholesterol - precursor for sex hormones

Carotenoids - carotene - yellow pigment of veggies (Vit. A precursor)

Monogastrics

Digestion: goal = TG ® MG + 2 FA ® absorbed

TG insoluble ® must become soluble

1. Course emulsion is formed - (Fat globule) in stomach - HCl

2. Bile acts to form droplet - duodenum

3. Lipase acts at the fat:water interface and cleaves FA #1 and #3

4. Micelles - 2MG, FFA & bile salts are formed with polar (hydrophilic) on outside and non-polar (lipophilic) on inside of micelle

5. upon contact with microvilli in duodenum - MG & FFA absorbed

6. as absorbed, MD & FA are immediately resynthesized to TG and Phospholipids

7. TG droplets enveloped by lipoprotein - chylomicron - exits cell to lymph system (NOT BLOOD!!)

8. Glycerol is passively absorbed

9. short chain FA (more water soluble) are absorbed without chylomicron, and go to the blood. If #2 FA is short chain, goes to lymph!