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Table 2 Conditions and constants of four organic acids during the acidolysis

From: Comparison of various organic acids for xylo-oligosaccharide productions in terms of pKa values and combined severity

Temperature (℃)/time (min) Acid type pHa CS
130/20 Formic acid 1.63 0.55
Glycolic acid 1.64 0.54
Lactic acid 1.82 0.36
Acetic acid 2.12 0.06
130/45 Formic acid 1.51 1.03
Glycolic acid 1.56 0.98
Lactic acid 1.75 0.79
Acetic acid 2.04 0.5
130/75 Formic acid 1.36 1.4
Glycolic acid 1.41 1.35
Lactic acid 1.54 1.22
Acetic acid 1.89 0.87
150/20 Formic acid 1.45 0.38
Glycolic acid 1.51 0.32
Lactic acid 1.70 0.13
Acetic acid 1.98 − 0.15
150/45 Formic acid 1.32 0.86
Glycolic acid 1.42 0.76
Lactic acid 1.58 0.6
Acetic acid 1.87 0.31
150/75 Formic acid 1.12 1.29
Glycolic acid 1.24 1.17
Lactic acid 1.31 1.1
Acetic acid 1.61 0.8
170/20 Formic acid 1.26 0.72
Glycolic acid 1.35 0.63
Lactic acid 1.58 0.4
Acetic acid 1.73 0.25
170/45 Formic acid 1.12 1.20
Glycolic acid 1.24 1.08
Lactic acid 1.40 0.92
Acetic acid 1.61 0.71
170/75 Formic acid 0.98 1.57
Glycolic acid 1.11 1.44
Lactic acid 1.17 1.38
Acetic acid 1.45 1.10