Piroxicam-Collagen-Based Sponges for Medical Applications

Table 1

FTIR spectra peak position and assignments for collagen sponges.

Assignment	Wavenumber (1/cm)
	Collagen sponge	piroxicam sponge	piroxicam sponge	piroxicam sponge
N-H stretch (νNH) of amide A [29, 30]	3540	3569	3552	3550
Hydrogen bonding of the N-H group with a carbonyl group of the peptide chain [29]
CH2 asymmetrical stretch (νasCH2) by amide B band [29, 30]	3017	3008	3016	3007
C-O stretching vibration (νCO) [29]	1681	1681	1680	1680
Amide I C=O stretching [30, 31]
Hydrogen bond between N-H stretch (νNH) and C-O (νCO) [29]	1607	1606	1608	1610
Helical structure of collagen [29]	1494	1499	1499	1496
Stretching vibration of the C-N group [29]
C=N stretching of piroxicam [31]
CH2 deformation (δCH2) [32]
CH3 bend (δCH3) [32]	1443	1441	1443	1443
CH2 bending vibration (δCH2) [30]
CH2 group wagging vibration [29]	1376	1379	1387	1380
NH deformation of amide III (δNH) [32]	1274	1274	1273	1275
Hydrogen bonding of N-H bending [29, 30]	1241	1237	1240	1240
NH deformation of amide III (δNH) [32]	1191	1192	1189	1190
S=O asymmetric stretching [31]
Ester bond [29]	1113	1113	1115	1113
ν(C-O), ν(C-O-C) of carbohydrate moieties (collagen) [32]	1062	1063	1062	1063
Skeletal stretching vibrations [30]	899	899	900	900