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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)

From: Composition and structure of natural organic matter through advanced nuclear magnetic resonance techniques

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
  1. a Polar C polar aliphatic (45–95 ppm) + polar aromatic and C=O (145–220 ppm)