Chapter 18, Problem 18.57AP

Interpretation Introduction

Interpretation:

Zwitterion form of Lysine and $pI$ is to be identified.

Concept introduction:

Many amino acids are linked together through amide bonds to form a biologically large molecule known to be proteins.

Amino functional group is $(-N{H}_2)$ and carboxyl functional group is $(-COOH)$ and a $R$ group is considered as side chain, when all these are bonded to same carbon atom.

Zwitterion has both positive as well as negative charge, thus it is also called neutral dipolar ion.

Zwitterion accepts proton in acidic condition and in basic condition zwitterion lose electrons.

Isoelectric point $pI$, are $pH$ which the zwitterion has zero charge.

$pI=1/2\left(p{k}_a+p{k}_b\right)$