3.4. FTIR
The FTIR spectra of extracted keratin in the region 400–4000 cm−1 are given in Fig. 3, where the characteristic absorption bands are mainly assigned to the peptide bonds keratin were 10,240 and 10,000 respectively. This GPC data agrees
with published data that feather keratin consists of 96 amino acid
residues and has a molecular weight of 10,206 [6]. The polydispersion
degree was at the level of 1.024, which shows that the
extracted keratin was uniform in its molecular weight. However,
the yield of extracted keratin was less 25%, probably because keratin
was degraded to amino acids and small peptides and not
separated from reaction mixture completely.