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Chapter 4: Q34P (page 96)

What is the approximate net charge of carnosine (a) at pH 3, (b) pH 5,

(c) pH 7, and (d) pH 9?

Short Answer

Expert verified

a) At pH3 = +1

b At pH5 = +1

c) At pH7 = 0

d) At pH9 = -1/2

Step by step solution

01

Carnosine-amino acid

Carnosine is a powerful antioxidant commonly found in proteins. It is composed of two amino acids, beta-alanine, and histidine. Thus, it is a dipeptide molecule because of these two amino acids combination.

02

Net charge at different

To determine the net charge on amino acid, three conditions is given below:

1)pH<pKa鈫�protonated2)pH>pKa鈫�deprotonated3)pH=pKa鈫�12protonated,12deprotonated

Carnosine structure with itspKavalues are given below:

From the given pKa values, net charge of carnosine can be calculated.

Each ionizing group adds all charges at a given pH to get a net charge.

pHAminoCarboxylicimidazoleNetchargegroupgroupring3+1-1+1+15+1-1+1+170-1+1090-1+12-12

Hence, the net charge of carnosine at differentpHis calculated.

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