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Table 4 Yields of phenolic acids and aldehydes (w/w, μg/mg) a from alkaline nitrobenzene oxidation of untreated and biopretreated cellulosic samples

From: Structural evaluation and bioethanol production by simultaneous saccharification and fermentation with biodegraded triploid poplar

Samplesb C 0 C 4 C 8 C 12 C 16
p-hydroxybenzoic acid 4.77 4.70 3.95 3.40 2.34
p-hydroxybenzaldehyde 0.20 0.15 0.07 0.05 0.16
vanillic acid 1.11 1.32 0.78 1.01 1.57
syringic acid 2.22 2.30 1.72 1.69 2.20
vanillin 15.63 15.90 15.40 14.40 14.18
syringaldehyde 24.18 19.13 17.93 15.12 14.83
acetovanilline 0.54 NDc ND 0.25 ND
acetosyringone 0.34 ND ND 0.26 ND
Total 48.99 43.49 39.86 36.18 35.27
  1. aThe standard deviations are less than 5%; bCorresponding to the cellulosic residues in Table 1; cNot detectable.