Evaluation of the two-step treatment with ionic liquids and alkali for enhancing enzymatic hydrolysis of Eucalyptus: chemical and anatomical changes

Table 1 Chemical compositions of the control, ILs-pretreated, and alkali post-treated substrates obtained after the synergistic treatment

Samples^a	Glucan (%)		Xylan (%)		AIL (%)	ASL (%)	Lignin (%)		Solid recovery (%)
Samples^a	C	R	C	R	AIL (%)	ASL (%)	C	R	Solid recovery (%)
Control	41.58		15.85		25.44	3.96	29.40		100
BCl	42.32	0.57	15.87	2.18	23.77	4.07	27.84	7.50	97.69
BAc	43.94	1.05	14.84	12.33	21.81	4.26	26.07	16.97	93.64
Control-4	46.99	10.49	12.17	39.18	25.20	3.88	29.08	21.65	79.21
BCl-4	47.94	11.32	12.24	40.60	24.02	3.66	27.68	27.58	76.92
BAc-4	48.90	11.99	11.94	43.63	23.09	3.81	26.90	31.53	74.83

^aControl: raw material; BCl and BAc: samples obtained after the pretreatment with [Bmim]Cl and [Bmim]OAc at 120 °C for 30 min, respectively; Control-4, BCl-4, and BAc-4: residues obtained after the successive treatment with 0.5, 2.0, and 4.0 % NaOH at 90 °C for 2 h from the untreated, [Bmim]Cl-pretreated, and [Bmim]OAc-pretreated Eucalyptus, respectively
AIL acid insoluble lignin, ASL acid soluble lignin, C the content of each composition, R the removal of each composition after treatment on the basis of its original amount in the raw material

ISSN: 2731-3654