BCHE 395-2 2014 Weak Interactions

To approach space lling models such as this depict

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Unformatted text preview: rdered Hydra2on Shells (Ions) •  Outer hydra2on shell: semi- ordered •  Inner hydra2on shell: chemisorbed and ordered •  Bulk water (random arrangement) Wait! Think about the energy needed to maintain “order” Which needs more energy input: Order or chaos (random)? Ions “order” water into hydra2on shells Water: Interac2on with Solutes •  Hydrophobic, nonpolar: do not form H- bonds •  Ex. Hydrocarbons: ex. CH3- CH2- CH2- CH2- CH2- CH3 Water ”straddles” hydrocarbons Forms clathrate cages to maximize H- bonds web.virginia.edu/Heidi/chapter2/chp2.htm Water: The Hydrophobic Effect •  Refers to the associa2on or folding of nonpolar molecules in the aqueous solu2on •  Is one of the main factors behind: –  protein folding –  protein- protein associa2on –  forma2on of lipid micelles –  binding of steroid hormones to their receptors •  Does not arise because of some aLrac2ve direct force between two nonpolar molecules Water: Interac2on with Solutes •  Amphipathic (non- polar and polar) molecules Water: Interac2on with Solutes •  Amphipathic lipid aggregates that form in water –  Decrease in order, decrease in energy – ...
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