Impact of the supramolecular structure of cellulose on the efficiency of enzymatic hydrolysis

Table 1 Chemical composition (in percentage) of the substrates studied

Substrate	Avicel	OPHS-ND and OPHS-D	NCC-OPHS-ND	Cotton and cotton + NaOH ^a
Acid-insoluble lignin	n.a.	0.5	n.d.	n.a.
Acid-soluble lignin	n.a.	0.5	n.d.	n.a.
Extractives	n.d.	<0.25	n.d.	0.7
Ash content	n.d.	<0.1	n.d.	0.2
Xylose	2.2	1.5	0.8	0.5
Mannose	0.9	0.8	0.8	0.1
Arabinose	<0.1	<0.1	<0.1	0.1
Galactose	<0.1	<0.1	<0.1	0.2
Glucose	96.8	96.7	98.4	98.2

Major hemicelluloses in softwood (OPHS-ND, OPHS-D and NCC-OPHS-ND substrates) are (galacto)glucomannan, galactoglucomannan and arabinoglucuronoxylan and major hemicelluloses in hardwood are glucuronoxylan and glucomannan [35]. ^aCarbohydrate composition analysis was done on cotton substrate. Since cotton has such a high degree of purity, NaOH treatment is not expected to change its chemical composition. n.a., not applicable; n.d., not determined.

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