Table 4. FTIR analysis of treated and untreated fungal species with Ag-SeO₂ NC.

Wavenumber (cm−1)	Untreated C. glabrata	Treated C. glabrata	Untreated A. niger	Treated A. niger	Functional group	Interpretation
3353–3526	3353, 3273	3366, 3276	3526, 3275	3365, 3275	O–H	O–H stretching vibration
2935–2968	2935	2933, 2873	2968, 2930, 2872	2934, 2873	C–H	C–H stretching vibration (aliphatic)
1674–1688	1674	1674, 1642, 1579	1688	1674, 1578	C O	Amide I band (carbonyl stretching)
1550–1516	1550, 1516	1516	1503, 1452	1516, 1450	C–N	Amide II band (N–H bending and C–N stretching)
1452–1452	1452	1451	1452	1450	C–H	C–H bending vibration (methylene)
1405–1412	1405, 1398	1406, 1399	1412, 1385	1406, 1399	C–H	C–H bending vibration (methyl)
1308–1399	1308	1338, 1309	1236	1309, 1238	C–N	C–N stretching vibration
1238–1238	1238	1238	1236	1238	C–O	C–O stretching vibration (phenolic)
1120–1122	1120	1120	1122	1120	C–O	C–O stretching vibration (alcoholic)
1078–1078	1078	1078	1078	1079	C–O	C–O stretching vibration (alcoholic)
1037–1032	1037	1038	1032	1037	C–O	C–O stretching vibration (alcoholic)
981–990	981	990	979	923	C–H	C–H bending vibration (aromatic)
924–924	924	923	924	923	C–H	C–H bending vibration (aromatic)
851–850	851	850	849	850	C–H	C–H bending vibration (aromatic)
774–775		774	775	775	M–O	Metal–oxygen bond (Ag–O or Se–O)
653–400	530	530, 400	702, 653, 531, 398	425, 400	C–C, C–N, C–O	Skeletal vibrations