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Table 5 The effect of xylanase pretreatment on the physical and optical properties of rice straw pulp

From: Effect of polyols on thermostability of xylanase from a tropical isolate of Aureobasidium pullulans and its application in prebleaching of rice straw pulp

Treatment

Brightness

Tensile index

Tear index

Fiber length

Fines content

Fiber curl

Fiber kink

 

(ISO Units)*

(N.m g-1)*

(mN.m2g-1)*

(mm)*

(%)*

index*

index*

Untreated

39.5 ± 0.10a

39.8 ± 5.90

7.68 ± 0.50a

0.93 ± 0.05

49.3 ± 0.34a

0.07 ± 0.002a

1.48 ± 0.04a

H2O2

55.5 ± 1.00b

35.8 ± 7.00

6.56 ± 0.61a

1.01 ± 0.05

45.2 ± 0.14b

0.07 ± 0.003a

1.42 ± 0.03b

Xylanase + H2O2

62.8 ± 0.40c

42.4 ± 3.90

12.2 ± 0.75b

0.93 ± 0.05

40.6 ± 0.90c

0.09 ± 0.002b

1.59 ± 0.02c

Xylanase + Sorbitol + H2O2

63.0 ± 0.58c

46.3 ± 4.90

13.1 ± 1.30b

1.00 ± 0.16

39.7 ± 0.30c

0.10 ± 0.008c

1.65 ± 0.02d

  1. All treatments were incubated in 50 mM of sodium acetate buffers (pH 6.0) at 70°C for 2 h for pretreatment and bleached at the same temperature for 1 h. The crude xylanase (18.6 U g-1 dry pulp) used in prebleaching experiment was obtained from A. pullulans CBS 135684 cultivated in basal medium containing 1% (w/v) corncob. Sorbitol (0.75 M) and H2O2 (10% (v/v)) were used in the respective experiment.
  2. *Mean ± one standard deviation derived from three replicates (N = 3). Different superscript letter (a,b,c) in the same column indicated the values were significantly different (ANOVA and DMRT, P < 0.05).