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

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

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) [3234]
1747 C=O stretch (amorphous) [32, 34]