BIO 201 Lecture Notes - Lecture 5: Trans Fat, Chemical Polarity, Carboxylic Acid
28 Mar 2017
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Document Summary
Biologically important lipids: fatt(cid:455) a(cid:272)ids (cid:894)a. k. a. (cid:862)free fatt(cid:455) a(cid:272)ids(cid:863)(cid:895) Acidic: loses this proton at physiological ph 7. Temperature at which solid -> liquid=melting temperature (tm) Palmitic acid (c16) tm= 63 degrees celsius. Unsaturated: at least one c=c double bond. Oleic acid (c=18) tm= 13 degrees celsius. Saturated: straight but flexible, can pack tightly, lots of van der waals, lots of energy to separate, high tm. Unsaturated: bent and rigid, poor packing ability, few interactions, little energy to separate, low tm. Trans fats- unsaturated fatty acids with trans double bonds. Natural unsaturated fatty acids are cis (bent) Chemically unsaturated fatty acids are trans (not bent) High tm like saturated fats: triglycerides: storage form of fatty acids. 3 carbon backbone, 3 oh groups, 3 condensation reactions with 3 fatty acids. Attaches to acid end of fatty acid: phospholipids: form all cellular membranes. Amphipathic or amphiphilic, molecules with polar and nonpolar character. Self organize into micelles, liposomes, and lipid bilayers.
