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Chapter 10 Lipids

Storage lipids Structural lipids in membranes Lipids as signals, cofactors, and pigments Separation and analysis of lipids. Fatty acids. Triacylglycerols(?????). glycerolphospholipidsSphingolipidsgalctolipids

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Chapter 10 Lipids

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    29. 29 Phospholipids Sphongolipids membrane pilids; esp rich in nervous tissue long chain amino alcohol, sphingosine replaces glycerol no net -ive charge e.g.phosphatidyl choline -ve charge e.g. phosphatidyl glycerol serine Sphingomyelin in animals- sphingosene,a single FA and phosphorylcholine head. Phyto sp in plantsSphongolipids membrane pilids; esp rich in nervous tissue long chain amino alcohol, sphingosine replaces glycerol no net -ive charge e.g.phosphatidyl choline -ve charge e.g. phosphatidyl glycerol serine Sphingomyelin in animals- sphingosene,a single FA and phosphorylcholine head. Phyto sp in plants

    36. 36 Sphingophospholipids Sphingophospholipid sphingosine replaces glycerol membrane lipids esp rich in nervous tissue no net charge e.g. phosphatidyl chline (myelin coat tonerves) Sphingophospholipid sphingosine replaces glycerol membrane lipids esp rich in nervous tissue no net charge e.g. phosphatidyl chline (myelin coat tonerves)

    37. 37 Glycolipids (e.g. cerebrosides and gangliosides) Sphingosine + 1 mol FA + CarbsSphingosine + 1 mol FA + Carbs

    47. 47 Lipids and structure of the plasma membrane Phospholipids in aq soln spontaneously form symmetrical bilayer sheets 2 molecules thick (diag) (Each layer =leaflet) ,unlimited size; seal at each end ( closed structures/cell compartments). HC chains align in centre to minimise contact with water van der W between side chains stabilise the close packing Interaction polar heads with water stabilised by electrostatic attraction and H bonds. NOT static - lipid mols rotate rapidly about their long axis and rapidly exchange places with neighbours in leaflet ( 10 per second) Protein in membrane interact with hydrophobic core - must adopt appropriate conformation cf- water soluble proteins.Phospholipids in aq soln spontaneously form symmetrical bilayer sheets 2 molecules thick (diag) (Each layer =leaflet) ,unlimited size; seal at each end ( closed structures/cell compartments). HC chains align in centre to minimise contact with water van der W between side chains stabilise the close packing Interaction polar heads with water stabilised by electrostatic attraction and H bonds. NOT static - lipid mols rotate rapidly about their long axis and rapidly exchange places with neighbours in leaflet ( 10 per second) Protein in membrane interact with hydrophobic core - must adopt appropriate conformation cf- water soluble proteins.

    63. 63 Vitamins Fat soluble: vitamins A,D,E,K Long chain polyunsaturates hydrocarbons attached to 1 or 2 benzene rings

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