The structure of chitosan, a polymer used to eliminate protein clumps that create wine haze in white wine

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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The structure of chitosan, a polymer used to eliminate protein clumps that create wine haze in white wine, is shown below. The amine functional group on chitosan has a pka of 6.5 in its conjugate acid form. What is the charge state of the amine group of chitosan in wine with a pH of 3.6, given the following acid-base reaction, where chitosan is abbreviated as R? (If you need it, the Henderson-Hasselbach connection is also provided.) [RNH2] [RNH;] NH2 RNH2 + H20 2 RNH + 0H- pH = pKa+ log OH n a) At pH 3.6, it is negatively charged; b) At pH 3.6, it is positively charged; c) At pH 3.6, it is both positively and negatively charged; d) At pH 3.6, it is neutral.

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