question about the solubility of ethnol

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biologyny
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question about the solubility of ethnol

Post by biologyny » Sat Jan 27, 2007 7:51 am

As we know ethnol can be dissolved in water.
But why it can dissolve lipids at the same time?
Can anyone explain the theory to me?
Thanks!

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Dr.Stein
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Post by Dr.Stein » Sat Jan 27, 2007 8:30 am

Ethanol molecule has hydrophilic -OH group that helps it dissolve polar molecules and ionic substances while hydrophobic hydrocarbon chain CH3CH2- can attract non-polar molecules. Thus ethanol can dissolve both polar and non-polar substances.
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biologyny
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Post by biologyny » Sat Jan 27, 2007 8:46 am

I get it!
Thank you very much!

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Post by sdekivit » Sun Jan 28, 2007 9:41 am

in fact: when extracting lipids with choloroform, methanol is used to dissolve the apolar lipids in the chloroform to let it dssolve in a water phase. (same effect as ethanol, only a bit better)

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Post by Dr.Stein » Tue Jan 30, 2007 9:11 am

Aha! Thank you! I learn something about extraction today :)
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