TABLE 3.

Inhibitor composition of four quaternary mixtures used to assess yeast inhibitor tolerance.

	Concentration (g/L)
Inhibitor	RC25	RC50	RC100	RC200
Acetic acid	1.80	3.60	7.20	14.40
Formic acid	0.60	1.20	2.40	4.80
Furfural	0.68	1.35	2.70	5.40
HMF	0.95	1.89	3.78	7.56

Before adjustment, pH-values of inhibitor mixtures RC₂₅, RC₅₀, RC₁₀₀, and RC₂₀₀ were 2.60, 2.50, 2.40, and 2.20, respectively.