Table 1 Band assignments^a,b for the FTIR spectra of CDA^a and starch^c.

Band in the FTIR spectrum of CDA (cm⁻¹)^a,b	Assignment	Band in the FTIR spectrum of starch (cm⁻¹)^b	Assignment
3700–3000 centred at 3419	O–H stretching	3600–3000	O–H stretching
2918	CH₂ deformation	3000–2800	CH₂ deformation
2150	Combination of hindered rotation and OH bending	2100	Combination of hindered rotation and OH bending^d
1638	C=O of amide residues	1642	O–H from adsorbed water
1420	Lignin CH₂ deformation and cellulose CH₂ stretch; alginate COO⁻ symmetric stretch^e	1415	CH₂ bending, C–O–O stretch
1157–1030	C–O–C vibrations of ether linkages and Si–O stretch	1242–1094	CH₂OH, C–O, C–C stretching and C–O–H bending

^aData from this work. ^bThe AIST Spectral Database for Organic Compounds facilitated FTIR peak assignments, in addition to other literature sources cited. ^cData taken from ref. 38. ^dSee Ref. ⁴⁰. ^eAlginate was used in the preparation of CDA matrix (see caption to Fig. 1A).

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