Inhibition of microbial biofuel production in drought-stressed switchgrass hydrolysate

Table 2 Concentrations (μM) of imidazoles and pyrazines (estimated) and aromatic degradation products in pretreated biomass hydrolysates

	Corn stover 36H56		Corn stover P0448R		Switchgrass
	2010	2012	2012	2013	2010	2012	2013
1-Methylimidazole	2	0	ND	0	1	1	5
2-Methylimidazole	26	42	33	44	45	137	37
4(5)-Methylimidazole	67	86	214	264	76	356	60
2,4-Dimethylimidazole	13	14	36	49	5	6	12
2-Methylpyrazine	4	6	11	10	14	114	10
2,5-Dimethylpyrazine	0	0	1	1	1	9	1
2,6-Dimethylpyrazine	1	1	4	4	3	38	2
Sum of imidazoles and pyrazines	112	150	299	371	144	661	126
Acetamide	7755	7114	8283	8309	8888	11,372	8981
Coumaroyl amide	5034	3152	3763	4502	1622	1751	1908
Feruloyl amide	2044	1529	2181	2186	593	1179	753
Coumaric acid	1328	489	774	937	225	268	257
Benzoic acid	132	168	121	124	304	225	300
Vanillin	181	141	156	146	71	69	86

ISSN: 2731-3654