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BCHE 395-15 2014 Lipids

Shelf life or stability at high temperature of oils

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Unformatted text preview: bon chains à༎ C4 to C36 •  Saturated: no double bonds in hydrocarbon tail stearate –  Solid at room temp; higher mel9ng point •  Unsaturated: double bonds contained in hydrocarbon tails –  Liquid (oils) at room temp; lower mel9ng points oleate Saturated vs. Unsaturated Fa"y Acids H •  Saturated: ConformaXon is straight, fully extended H C C CH2 –  Pack Xghtly together CH2 cis- •  Unsaturated: ConformaXon “kinked” in cis double bond (common) H H HOOC HOOC tran (rar –  InteracXons weaker, cannot pack C Xghtly together C CH2 CH2 •  Unsaturated trans fa"y acids are rare, but can be “cisindustrially” made by hydrogenaXon HOOC HOOC •  Medically not good trans(rare) COOH cis(common) Packing of Fa"y Acids •  Lipid interacXons can be disrupted by detergents •  Double...
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