Page 120 - Basic Principles of Textile Coloration

STRUCTURE OF WOOL FIBRES 109

Table 7.1 Structure and amount of major amino acids in wool [2]

Mol % Nature of

Amino acid Structure(a) (from two sources) side-chain

Glycine HCHCOOH 8.6 8.2 Hydrocarbon
Alanine NH2 5.3 5.4 Hydrocarbon
Phenylalanine 2.9 2.8 Hydrocarbon
Valine CH3CHCOOH 5.5 5.7 Hydrocarbon
NH2 Hydrocarbon
Hydrocarbon
CH2CHCOOH Polar
NH2 Polar
Polar
H3CCHCHCOOH Acidic
H3C NH2

Leucine H3CCHCH2CHCOOH 7.7 7.7

H3C NH2

Isoleucine H3CCH2CHCHCOOH 3.1 3.1
H3C NH2

Serine HOCH2CHCOOH 10.3 10.5
NH2

Threonine H3CCHCHCOOH 6.5 6.3
HO NH2

Tyrosine 4.0 3.7
Aspartic acid(b) HO CH2CHCOOH 6.6

NH2

HOOCCH2CHCOOH 6.4
NH2