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Table 2 pK a values of compounds and relative toxicities for glucose and xylose were calculated by dividing the mean of inhibitor concentrations at IC 25 , IC 50 , IC 75 and IC 100 when grown in glucose divided by the mean inhibitor concentration at respective IC when grown in xylose

From: Inhibition of growth of Zymomonas mobilis by model compounds found in lignocellulosic hydrolysates

Compound pKa Average ratio of IC in RMG/IC in RMX
Organic acids   
Levulinc acid 4.59 4.5 +/- 0.5
Benzoic acid 4.18 4.1 +/- 1.3
Acetic acid 4.76 3.7 +/- 0.4
Formic acid 3.75 3.2 +/- 0.8
Caproic (Hexanoic) acid 4.85 2.2 +/- 0.4
Lactic acid 3.86 1.9 +/- 0.4
2-Furoic acid 3.16 1.9 +/- 0.4
Vanillic acid 4.31, 8.81 1.4 +/- 0.1
Ferulic acid 4.56, 8.65 1.4 +/- 0.1
4-Hydroxycinnamic acid 4.63, 9.58 1.3 +/- 0.2
4-Hydroxybenzoic acid 4.48, 9.32 1.1 +/- 0.06
Itaconic acid 3.85, 5.45 0.9 +/- 0.1
Succinic acid 4.16, 5.61 1.0 +/- 0.2
Oxalic acid 1.27, 4.27 0.9 +/- 0.04
Inorganic acids   
Hydrochloric acid   0.8 +/- 0.2
Sulfuric acid   0.7 +/- 0.1
Phosphoric acid   0.6 +/- 0.1
Nitric acid   1.1 +/- 0.1
Aldehydes   
5-Hydroxymethylfurfural (HMF) -0.37 1.0 +/- 0.1
Furfural 0.41 0.8 +/- 0.1
Syringaldehyde 0.99 0.9 +/- 0.1
Vanillin 1.21 1.5 +/- 0.4
4-Hydroxybenzaldehyde 1.35 1.6 +/- 0.1
Alcohols   
Furfuryl alcohol 0.28 1.0 +/- 0.1
Ethanol -0.24 1.0 +/- 0.1