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Table 1 Sample treatments, slurry pH after steam explosion and the combined severity factors calculated as in [11] which determine severities based on the pH after the treatment

From: Effects of pH on steam explosion extraction of acetylated galactoglucomannan from Norway spruce

Buffer

Average pH

St. dev.

Average combined severity \(R^{\prime}_{0}\)

St. dev.

Man:Glc:Galratio

Bound acetate µmol/mg carbohydrate

MilliQ H2O control

3.7

0.009

1.707

0.037

1.88:1:0.28

0.30

0.5 M citrate pH 4.0

4.2

0.009

0.511

0.011

2.71:1:0.39

0.31

0.5 M citrate pH 5.0

5.0

0.041

0.092

0.009

1.64:1:0.51

0.11

0.5 M citrate pH 6.0

5.6

0.012

0.024

0.001

0.67:1:0.53

n.d.

1 M phosphate pH 6.0

5.3

0.045

0.042

0.004

1.39:1:0.23

n.d.

1 M phosphate pH 6.5

5.9

0.017

0.010

0.000

0.19:1:0.11

n.d.

1 M phosphate pH 7.0

6.3

0.031

0.004

0.000

0.23:1:0.16

n.d.

  1. In all samples buffering the SE reaction has resulted in final pH higher (pH 4.2–6.3) than that of the control samples (average pH 3.7). 0.5 M citrate and 1 M phosphate at pH 6.0 resulted in different final pH, highlighting the difference in the buffering capacity between citrate and phosphate