Cellulose

, Volume 20, Issue 3, pp 1109–1119

Cellulose loading and water sorption value as important parameters for the enzymatic hydrolysis of cellulose

Authors

  • Thomas Stauner
    • Institute of ChemistryUniversity of São Paulo
  • Igor B. Silva
    • Institute of ChemistryUniversity of São Paulo
  • Omar A. El Seoud
    • Institute of ChemistryUniversity of São Paulo
  • Elisabete Frollini
    • Instituto de Química de São CarlosUniversidade de São Paulo
    • Institute of ChemistryUniversity of São Paulo
Original Paper

DOI: 10.1007/s10570-013-9904-8

Cite this article as:
Stauner, T., Silva, I.B., El Seoud, O.A. et al. Cellulose (2013) 20: 1109. doi:10.1007/s10570-013-9904-8

Abstract

The enzymatic hydrolysis of cotton raw cellulose (RC) samples, sieved RC samples through meshes <100 (CS1), 100–200 (C12), 200–400 (C24), mercerized RC samples (M-C), freeze-dried RC (RC-FD) samples, microcrystalline cellulose Avicel, bacterial cellulose (BC), raw sisal pulp and mercerized sisal pulp (S-M) was performed at cellulose-to-cellulase mass ratios of 1,000:1, 699:1, 400:1, 100:1 and 10:1. The index of crystallinity and water sorption values were quantified for all samples. The morphological features were analyzed by means of scanning electron microscopy (SEM). For cellulose-to-cellulase mass ratio of 100:1 and 10:1, the maximum hydrolysis extents of cellulose samples after 24 h reaction could not be correlated with their physical characteristics. However, hydrolyses of samples with large water sorption values were faster than those with lower water sorption values. The hydrolysis efficiency decreased when the cellulose-to-cellulase mass ratio was greater than 400:1; under this condition a remarkable dependence of the hydrolysis yield on the type of cellulosic sample was observed. The water sorption ability could be directly correlated with the hydrolysis extent, except for RC-FD and BC samples, which presented the lowest values. In the former, freeze-drying has led to pore collapse, with concomitant reduction of the amount of adsorbed water. For the latter sample, the densely packed structure made the water sorption slower than in all other samples. Despite of this fact, the presence of nanofibrils on the surface of BC (as detected by SEM) improved the enzyme adsorption, indicating that analysis by complementary techniques should be performed in order to predict the enzymatic hydrolysis efficiency.

Keywords

CellulaseCelluloseHydrolysisWater sorption valueCellulose loading

Supplementary material

10570_2013_9904_MOESM1_ESM.docx (1009 kb)
Supplementary material 1 (DOCX 1008 kb)

Copyright information

© Springer Science+Business Media Dordrecht 2013