Localization of polyhydroxybutyrate in sugarcane using Fourier-transform infrared microspectroscopy and multivariate imaging

Table 1 Poly[(R)-3-hydroxybutyric acid] vibrational modes and spectral assignments

Vibrational mode (cm⁻¹)	Spectral assignment
979	C=C [31]
1045	C–CH₃ stretching [32]
1056	C–O stretching [32]
1101	C–O–C stretching [32]
1131	CH₃ rocking [32]
1182	C–O–C stretching [32, 33]
1228	C–O–C stretching [32, 33], CH₂ wagging [31]
1262	C–O–C stretching + CH deformation [32, 33]
1271	C–O–C stretching (amorphous) [32]
1280	C–O–C stretching (crystalline) [32, 33]
1290	CH deformation [32]
1356	CH deformation and CH₃ symmetric deformation [32]
1378	CH₃ symmetric deformation [32]
1456	CH₂ scissoring, CH₃ asymmetric deformation [32]
1720	C=O stretch (crystalline) [32–34]
1747	C=O stretch (amorphous) [32, 34]

ISSN: 1754-6834