09 28 09 notes
TRANSCRIPT
Biology and Human Concerns09/28/09
Lipids-Hydrophobic-Oils, fats, waxes-Fats – triacylglycerol
-glycerol + three fatty acids-fatty acids + glycerol = ester bond
Saturated Fatty Acids-Structural formula of a saturated fat molecule-Found in meat, animal protein
Unsaturated Fatty Acids-Liquid at room temperature-Oils
-Carbon double bond present in unsaturated fatty acids
Cholesterol – replace animal fatty acids (saturated) with plant fatty acids (unsaturated).
Good Fatty Acids?-All fatty acids have a carboxyl group at the “Alpha” end.
alphaomega
butyric acid
-Essential fatty acids, not made in our bodies-Omega 3 and Omega 6-Dark green leafy vegetables, flax, fish.-Help process HDL and LDL cholesterol. Decrease LDL, increase HDL.
“Trans” Fats-When plants or animals make unsaturated fats, they mostly build this
kinked “cis” form. Oleic acid, cis form.
Trans molecule – This hydrogenation process also converts the bent “cis” form to a
straightened “trans” form, which looks like this:Exposure to prolonged heat (as in deep frying) also creates trans fats by
loosening the double bond and allowing to flip into the straight form.
Phospholipids-one head hydrophobic (non-polar end), one head hydrophilic (polar end)
Phospholipid bilayerSteroids-Cholesterol and hormonal properties