Table 1 Quantification (%) of functional groups from the 13C multiCP/MAS NMR spectra for the bulk algal samples (OS) and related fractions (LF and NHC)
Samples | Alkyl 0–45 ppm | OCH3/NCH 45–60 ppm | Alkyl C–O 60–95 ppm | O–Alkyl–O 95–110 ppm | Arom C 110–145 ppm | Arom C–O 145–165 ppm | COO/NC=O 165–190 ppm | Ketone/aldehyde 190–220 ppm | (CH2)n 27.5–33.5 ppm | Polar Ca |
|---|---|---|---|---|---|---|---|---|---|---|
OS | ||||||||||
 Spirulina | 24.7 | 8.47 | 31.7 | 6.88 | 7.89 | 2.63 | 17.6 | 0.14 | 6.45 | 60.5 |
 Seaweed | 17.7 | 6.37 | 42.8 | 9.35 | 6.68 | 2.73 | 13.9 | 0.50 | 4.67 | 66.3 |
 Porphyra | 20.7 | 9.84 | 43.1 | 7.53 | 5.91 | 1.01 | 11.9 | 0.00 | 5.27 | 65.9 |
LF | ||||||||||
 Spirulina | 23.3 | 9.72 | 28.9 | 6.17 | 6.76 | 3.53 | 21.3 | 0.36 | 4.79 | 63.8 |
 Seaweed | 17.1 | 8.18 | 41.9 | 9.19 | 5.31 | 3.23 | 14.8 | 0.20 | 3.62 | 68.3 |
 Porphyra | 20.6 | 9.85 | 43.4 | 7.58 | 5.48 | 1.25 | 11.9 | 0.00 | 4.97 | 66.4 |
NHC | ||||||||||
 Spirulina | 17.7 | 5.17 | 8.72 | 8.60 | 23.3 | 16.3 | 13.8 | 6.32 | 4.22 | 50.3 |
 Seaweed | 14.9 | 4.02 | 12.6 | 11.1 | 22.3 | 19.5 | 10.4 | 5.23 | 3.91 | 51.8 |
 Porphyra | 19.1 | 8.79 | 11.0 | 6.45 | 36.4 | 13.4 | 4.96 | 0.00 | 7.15 | 38.2 |