Abstract
The dissolution of a softwood dissolving pulp in a NaOH/ZnO system was improved by means of a three-stage pretreatment with an initial xylanase treatment, followed by an alkaline extraction, and finally an endoglucanase stage. The solubility of the pulp increased from 29% to 81%, although the crystallinity and the specific surface area of the pulp did not change during the enzymatic treatment.
References
Borgin, K., Stamm, A.J. (1950) The exchange of radioactive zinc between cellulose and sodium hydroxide-sodium zincate solutions. J. Phys. Colloid Chem. 54:772–777.10.1021/j150480a004Search in Google Scholar PubMed
Chunilall, V., Bush, T., Larsson, P.T., Iversen, T., Kindness, A. (2010) A CP/MAS 13C-NMR study of cellulose fibril aggregation in eucalyptus dissolving pulps during drying and the correlation between aggregate dimensions and chemical reactivity. Holzforschung 64:693–698.10.1515/hf.2010.097Search in Google Scholar
Ciechanska, D., Wawro, D, Steplewski, W., Kazimierczak, J., Struszczyk, H. (2005) Formation of fibres from bio-modified cellulose pulp. Fibres Textiles in East Eu. 13:19–23.Search in Google Scholar
Engström, A.C., Ek, M., Henriksson, G. (2006) Improved accessibility and reactivity of dissolving pulp for the viscose process: pretreatment with monocomponent endoglucanase. Biomacromolecules 7:2027–2031.10.1021/bm0509725Search in Google Scholar PubMed
Eriksson, L., Johansson, E., Kettaneh-Wold, N., Wikström, C., Wold, S. Design of Experiments, Principles and Applications. Umetrics Academy, Umeå, Sweden, 2000.Search in Google Scholar
Evans, R, Wallis, A.F.A. (1989) Cellulose molecular weights determined by viscometry. Appl. Polym. Sci. 37:2331–2340.Search in Google Scholar
Fock W. (1959) Eine modifizierte method zur bestimmung der reaktivität von zellstoffen für viskosherstellung. Das Papier 13:92–95.Search in Google Scholar
Guan, B., Xie, L., Long, Y., Ding, Y. (1998) The mechanism of degrading LCC with xylanase aid-bleaching of pulp. J. Cell Sci. Techn. 1998–2002.Search in Google Scholar
Henriksson, G., Christiernin, M., Agnemo, R. (2005) Monocomponent endoglucanase treatment increases the reactivity of softwood sulphite dissolving pulp. Ind. Micro. Biotech. 32:211–214.Search in Google Scholar
Ibarra, D., Köpcke, V., Ek, M. (2010) Behavior of different monocomponent endoglucanase on the accessibility and reactivity of dissolving-grade pulps for viscose process. Enz. Micro. Techn. 47:355–362.Search in Google Scholar
Kihlman, M., Wallberg, O., Stigsson, L., Germgård, U. (2011) Dissolution of dissolving pulp in alkaline solvents after steam explosion pretreatments. Holzforschung 65:613–617.10.1515/hf.2011.094Search in Google Scholar
Kihlman, M., Aldaeus, F., Chedid, F., Germgård, U. (2012) Effect of various pulp properties on the solubility of cellulose in sodium hydroxide solutions. Holzforschung 66:601–606.10.1515/hf-2011-0220Search in Google Scholar
Kihlman, M., Medronho, B.F., Anabela, L., Germgård, U., Lindman, B. (2013) Cellulose dissolution in an alkali based solvent; Influence of additives and pretreatments. Braz. Chem. Soc. 24:1–9.Search in Google Scholar
Köpcke, V., Ibarra, D., Ek, M. (2008) Increasing accessibility and reactivity of paper grade pulps by enzymatic treatment for use as dissolving pulp. Nord. Pulp Paper Res. J. 23:363–368.Search in Google Scholar
Kvarnlöf, N. Activation of Dissolving Pulps Prior to Viscose Preparation. Ph.D. Thesis, Karlstad University, Karlstad, Sweden, 2007.Search in Google Scholar
Kvarnlöf, N., Germgård, U., Jönsson, L.J., Söderlund, C.A. (2007) Optimization of the enzymatic activation of a dissolving pulp before viscose manufacture. Tappi J. 6:14–19.Search in Google Scholar
Larsson, P.T., Wickholm, K., Iversen, T. (1997) A CP/MAS 13C-NMR investigation of molecular ordering in celluloses. Carbohyd. Res. 302:19–25.Search in Google Scholar
Le Moigne, N., Jardeby, K., Navard, P. (2010) Structural changes and alkaline solubility of wood cellulose fibers after enzymatic peeling treatment. Carbo. Poly. 79:325–332.Search in Google Scholar
Lindman, B., Karlström, G., Stigsson, L. (2010) On the mechanism of dissolution of cellulose. Mol. Liq. 156:76–81.10.1016/j.molliq.2010.04.016Search in Google Scholar
Liu, W., Zhou, S., Qi, X., Pu, J. (2013) Preparation of acetate-grade dissolving pulp from eucalyptus by processes including alkaline pretreatment and combined post-treatments with xylanase and alkali. Tappi J. 12:19–24.10.32964/TJ12.9.19Search in Google Scholar
Medronho, B., Romano, A., Miguel, M.G., Stigsson, L., Lindman, B. (2012) Rationalizing cellulose (in)solubility: reviewing basic physicochemical aspects and role of hydrophobic interactions. Cellulose 19:581–587.10.1007/s10570-011-9644-6Search in Google Scholar
Rabinovich, M.L., Melnick, M.S., Bolbova, A.V. (2002) The structure and mechanism of action of cellulolytic enzymes. Biochemistry (Moscow) 67:850–871.10.1023/A:1019958419032Search in Google Scholar
Rahkamo, L., Siika-aho, M., Vehvilainen, M., Dolk, M., Viikari, L., Nousiainen, P., Buchert, J. (1996) Modification of hardwood dissolving pulp with purified Trichodserma reesei cellulases. Cellulose 3:153–163.10.1007/BF02228798Search in Google Scholar
Rahkamo, L., Siika-aho, M., Viikari, L., Leppänen, T., Buchert, J. (1998) Effects of cellulases and hemicellulase on the alkaline solubility of dissolving pulps. Holzforschung 52:630–634.10.1515/hfsg.1998.52.6.630Search in Google Scholar
Schenzel, K., Fischer, S. (2005) New method for determining the degree of cellulose I crystallinity by means of FT Raman spectroscopy. Cellulose 12:223–231.10.1007/s10570-004-3885-6Search in Google Scholar
Trygg, J., Fardim, P. (2011) Enhancement of cellulose dissolution in water-based solvent via ethanol–hydrochloric acid pretreatment. Cellulose 18:987–994.10.1007/s10570-011-9550-ySearch in Google Scholar
Turbak, A.F. (1983) Newer cellulose solvent systems. In: Wood and Agricultural Residues. Ed. Soltes, E.J. Academic Press, New York. pp. 87–99.10.1016/B978-0-12-654560-9.50009-3Search in Google Scholar
Wickholm, K. Structural Elements in Native Celluloses. PhD Thesis, Royal Institute of Technology, KTH, Stockholm, Sweden, ISSN 1104–7003, 2001.Search in Google Scholar
Vehvilainen, M., Kamppuri, T., Rom, M., Janicki, J., Ciechanska, D., Grönqvist, S., Siika-Aho, M., Christoffersson, K.E., Nousiainen, P. (2008) Effect of wet spinning parameters on the properties of novel cellulosic fibres. Cellulose 15:671–680.10.1007/s10570-008-9219-3Search in Google Scholar
Vietor, R.J., Newman, R.H., Ha, M.A., Apperley, D.C., Jarvis, M.C. (2002) Conformational features of crystal-surface cellulose from higher plants. Plant 30:721–731.Search in Google Scholar
Wang, Y., Zhao, Y., Deng, Y. (2008) Effect of enzymatic treatment on cotton fiber dissolution in NaOH/urea solution at cold temperature. Carbohydr. Polym. 72:178–184.Search in Google Scholar
Wollboldt, P.R., Zuckerstätter, G., Weber, H.K., Larsson, P.T., Sixta, H. (2010) Accessibility, reactivity and supramolecular structure of E. globulus pulps with reduced xylan content. Wood Sci. Techn. 44:533–546.Search in Google Scholar
Woodings, C. Regenerated Cellulose Fibres. CRC Press LLC, Cambridge, 2001.10.1533/9781855737587Search in Google Scholar
Yamane, C., Aoyagi, T., Ago, M., Sato, K., Okajima, K., Takahashi, T. (2006) Two different surface properties of regenerated cellulose due to structural anisotropy. Polymer 38:819–826.10.1295/polymj.PJ2005187Search in Google Scholar
Zhou, X., Chen, J. (1998) The xylanase pretreatment of eucalyptus KP and its effects on hydrogen peroxide bleaching. China Pulp Paper Ind. (4) 1998. TS 745.Search in Google Scholar
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