Evaluation of ammonia fibre expansion (AFEX) pretreatment for enzymatic hydrolysis of switchgrass harvested in different seasons and locations

Table 1 Composition analysis (as percentage of total dry weight) for the July and October harvests of Cave-in-Rock (CIR) and Alamo switchgrass.

	CIR: July	CIR: October	Alamo: July	Alamo: October
Glucan^a	30.6 ± 0.2^d	33.6 ± 0.5^e	32.6 ± 0.3^f	32.9 ± 0.2^f
Sucrose	5.1 ± 0.3^d	2.4 ± 0.2^e	3.8 ± 0.2^f	3.8 ± 0.4^f
Xylan	19.4 ± 0.3^d	25.3 ± 0.2^e	22.8 ± 0.1^f	23.0 ± 0.2^f
Arabinan	2.0 ± 0.1^d	2.0 ± 0.1^f	1.8 ± 0.1^e	2.0 ± 0.1^d
Lignin^b	10.4 ± 0.4^d	16.7 ± 0.5^e	15.4 ± 0.4^f	17.2 ± 0.2^e
Solubles^c	26.0 ± 0.6^d	15.8 ± 0.1^e	18.1 ± 0.2^f	15.0 ± 0.2^g
Ash	5.0 ± 0.06^d	3.9 ± 0.02^e	2.5 ± 0.03^f	2.0 ± 0.01^g
Closure	95.4 ± 0.8	97.3 ± 0.7	93.2 ± 0.6	92.1 ± 0.4

Different letters (d, e,f,g) represent significant differences (P < 0.05) in composition across the different feedstocks.
^aDoes not include soluble glucose; ^bacid insoluble (Klason) lignin; ^cincludes both water and ethanol solubles.

ISSN: 2731-3654