Table 1.

Composition of untreated and pretreated poplar samples

	CONT	HYD	AMM	CHLO
Lignin contenta	28.12 ± 0.28	31.83 ± 0.86	27.24 ± 0.14	8.54 ± 0.37
S + Gb	1864.47 ± 81.76	1273.19 ± 186.77	1727.02 ± 212.27	180.36 ± 19.41
S/G	1.5	1.6	1.6	1.1
Total sugarsa	56.53 ± 2.23	59.85 ± 2.64	62.14 ± 2.97	65.85 ± 3.33
Glucosea	35.95 ± 1.40	44.64 ± 1.86	40.50 ± 1.96	42.32 ± 2.26
Xylosea	14.79 ± 0.47	12.25 ± 0.61	15.68 ± 0.72	17.80 ± 0.87
Mannosea	2.61 ± 0.11	1.93 ± 0.12	2.97 ± 0.14	3.10 ± 0.10
Arabinosea	0.35 ± 0.01	0.07 ± 0.01	0.37 ± 0.01	0.22 ± 0.01
Galactosea	0.92 ± 0.03	0.25 ± 0.01	0.89 ± 0.03	0.66 ± 0.02
Rhamnosea	0.38 ± 0.01	0,16 ± 0.01	0,37 ± 0.04	0,37 ± 0.01
Galacturonic acida	1.37 ± 0.02	0.50 ± 0.03	1.27 ± 0.07	1.25 ± 0.05
Glucuronic acida	0.16 ± 0.08	0.04 ± 0.01	0.09 ± 0.01	0.13 ± 0.01

^aLignin and sugar content expressed as percentage of dry matter

^bTotal yields of syringyl and guaiacyl units released by thioacidolysis expressed as µmol/g lignin