Table 4.

Initial and final concentrations of toxic compounds in hemicellulose hydrolyzate treated biologically by Picchia occidentalis Y1′a (g/L)

Exp.	Concentration	HMF (g/L)	Furfural (g/L)	Acetic acid (g/L)	Total phenols (g/L)	Total concentration (g/L)a	Removed amount of toxic compounds (%)b
1	Initial	0.037	0.1443	1.02	6.495	7.696	17.69
	Final	0.035	0.0293	0.92	5.35	6.334
2	Initial	0.0322	0.0575	1.57	6.02	7.679	20.5
	Final	0.0018	0.0035	1.33	4.77	6.105
3	Initial	0.037	0.1283	2.13	6.52	8.815	46.04
	Final	0.0009	0.0051	0	4.75	4.755
4	Initial	0.0317	0.1002	1.43	5.9	7.462	38.97
	Final	0.0015	0.002	0	4.55	4.553
5	Initial	0.034	0.1394	2.02	5.69	7.882	43.08
	Final	0.0016	0.005	0	4.48	4.486
6	Initial	0.0347	0.1415	2.04	5.63	7.842	42.79
	Final	0.0016	0.0049	0	4.48	4.486
7	Initial	0.034	0.1374	1.9	5.7	7.769	42.41
	Final	0.0015	0.0031	0	4.47	4.474

^a“Total concentration” (g/L) refers to the sum of the concentrations of HMF, furfural, acetic acid and total phenols

^b“Removed amount of toxic compounds” (%) refers to the difference between initial concentration and final total concentration (g/L)