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Roark
01-26-2006, 07:02 PM
i was hoping to make some homemade protein bars this weekend

but looking in the recipes forums i found a thread where someone linked an article stating that cooking whey(or even mxinig it in a blender) too long may "denature" it and cause it to lose it's value

http://wannabebigforums.com/showthread.php?t=69775

anyone?

Built
01-26-2006, 07:03 PM
All proteins denature when they cook.

No biggie.

Roark
01-26-2006, 07:04 PM
so the assertion that cooking the whey causes some kind of loss in protein value is wrong?

Built
01-26-2006, 07:08 PM
I'm sure it changes the bioavailability of it, but you'll still get protein out of it. Not something I'd lose too much sleep over.

Built
01-26-2006, 07:12 PM
http://en.wikipedia.org/wiki/Denaturation_(biochemistry)

Roark
01-26-2006, 07:16 PM
okay, i gotcha

i found this also


Heating whey proteins causes irreversible structural changes. Although these structural changes do not compromise the amount of digestible protein available to the body to any large degree, it does mean that the functional properties of the protein are lost.

so i'm going to conclude that cooking may change the way it acts in the body, but you get the same amount of protein as you would consuming it uncooked

thanks for your help

SpecialK
01-26-2006, 07:18 PM
http://en.wikipedia.org/wiki/Denaturation_(biochemistry)

This was taken from your article (which BTW isn't linked correctly - here is the full one - http://en.wikipedia.org/wiki/Denaturation_%28biochemistry%29)


Most proteins lose their biological function when denatured, For example, enzymes lose their catalytic activity, because the substrates can no longer bind to the active site, and because amino acid residues involved in stabilizing substrates' transition states are no longer positioned to be able to do so.

Wouldn't that imply that the protein might be worthless after it was baked?

Built
01-26-2006, 07:26 PM
No. It would imply that it wouldn't act anymore - as in, if you cooked an enzyme, it wouldn't be an active enzyme (something that can change other substances) anymore. It would still have calories and amino acids.

ddegroff
01-26-2006, 09:49 PM
wouldn't chewing denature protein?

Built
01-26-2006, 11:25 PM
Also digestion ...