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

Table 3 Yields of monolignol derivatives (w/w, μg/mg) ^a of untreated and biopretreated cellulosic samples, obtained from 4N NaOH extraction at 170°C

Samples^b	C ₀	C ₄	C ₈	C ₁₂	C ₁₆
p-hydroxybenzoic acid	3.29	2.62	2.12	1.77	1.68
p-hydroxybenzaldehyde	0.27	0.09	0.05	0.07	0.09
vanillic acid	1.32	1.30	1.14	1.05	1.06
syringic acid	1.27	1.27	1.02	1.03	1.08
vanillin	9.47	8.38	8.41	8.04	7.94
syringaldehyde	15.01	14.30	16.22	14.58	14.37
acetovanilline	0.76	0.82	1.02	0.62	0.51
acetosyringone	1.80	1.59	0.99	1.04	1.06
Total	33.20	30.38	30.98	28.18	27.79

^aThe standard deviations are less than 5%; ^bCorresponding to the cellulosic residues in Table 1.

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