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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: pretzalisa on September 21, 2009, 09:48:09 AM

Title: Arginine - Charge at different pH
Post by: pretzalisa on September 21, 2009, 09:48:09 AM

Is the charge on arginine the same in pH7 as in pH3?
Not sure... but i was thinking they would both be the same (protinated) as both pHs are below pI??

Thanks

Title: Re: Arginine - Charge at different pH
Post by: Yggdrasil on September 21, 2009, 11:51:38 AM

A good way to approach this problem would be to list out the pKa values of the three acid/base groups on arginine.

Title: Re: Arginine - Charge at different pH
Post by: zhangbo2007 on September 21, 2009, 12:59:24 PM

In fact, the positive charge on protonated arginine differs at different pH.