. 2023 Mar 22;28(6):2864. doi: 10.3390/molecules28062864

Table 7.

IR bands of functional groups on MWCNT-COOH.

	-OH	C=O	C=C	C-O	Reference
HNO₃/H₂SO₄	3400 cm⁻¹	1720 cm⁻¹	1600 cm⁻¹	1200 cm⁻¹	[32]
Naringenin	3396 cm⁻¹	1639 cm⁻¹	1470 cm⁻¹	---	[25]
Naringenin	3337 cm⁻¹	1721 cm⁻¹	1559 cm⁻¹	1049 cm⁻¹	[29]
Insulin	3300 cm⁻¹	1733 cm⁻¹	---	1239 cm⁻¹	[123]