Fractionation of DMSO-Extracted and NaOH-Extracted Hemicelluloses by Gradient Ethanol Precipitation from Neosinocalamus affinis

Table 2

The contents of neutral sugars and uronic acid (relative%, w/w) of hemicellulosic fractions obtained from DMSO-extracted and NaOH-extracted hemicelluloses.

	(%)	Molar (mol%)					GalA	Molar
		Ara	Gal	Glu	Xyl	GlcA		Ara/Xyl	GluA/Xyl
H30	5.8	3.6	0.5	0.7	93.7	1.5		0.038	0.016	0.13
H50	64.5	4	0.4	0.5	93.7	1.5		0.043	0.016	0.23
H70	8.5	2.8	0.3	0.5	95.4	1		0.029	0.011	0.28
H90	4.7	3.8	0.5	1	93.6	1.2		0.04	0.013	0.25
	7	8.5	0.3	0.3	87.5	3.4	0.1	0.097	0.039
	15.3	10.3	0.8	0.2	93.2	5.3	0.2	0.124	0.063
	14.9	23.1	4.6	0.4	62.8	8.7	0.4	0.367	0.139
	0.4	29.8	5.8	2.6	56.2	4.8	0.9	0.53	0.086

, , , and represent the hemicellulosic fractions obtained from DMSO-extracted hemicelluloses and , , , and represent the hemicellulosic fractions obtained from NaOH-extracted hemicelluloses. on DMSO-extracted and NaOH-extracted hemicelluloses (w/w). in relative molar percentages, Ara, arabinose; Gal, galactose, Glc, glucose, Xyl, xylose, GlcA, glucuronic acid, and GalA, galacturonic acid. the ratio of arabinose to xylose and glucuronic acid to xylose. degree of acetyl substitution of the four hemicellulosic fractions which are determined by integration of the signals of acetyl groups at 2.01 ppm and those of all carbohydrate signals.