714
Z. Voitko et al.
Fig. 3 IR spectra of the HA, HA–collagen composite samples, and pure collagen
Table 1 IR absorption bands
for all tested samples [15, 16]
Adsorption band (cm −1 )
Functional groups
HA
471, 560, 601, 959, 1023, 1088
PO 4
3−
874
HPO 4
2−
1425, 1453
CO 3
2−
HA–collagen composite
471, 560, 603, 961, 1022
PO 4
3−
873
HPO 4
2−
1422, 1450
CO 3
2−
Collagen
1632
– CO (amide I)
2920
– CH 2 –
3337
– NH (amide A)