Engström Ann-Charlott, Ek Monica, Henriksson Gunnar
Royal Institute of Technology, KTH, Fibre and Polymer Technology, SE 100 44 Stockholm, Sweden.
Biomacromolecules. 2006 Jun;7(6):2027-31. doi: 10.1021/bm0509725.
A high accessibility is an essential prerequisite for a homogeneous substitution of cellulose material. In this study, chemical and enzymatic pretreatments to increase the accessibility of cellulose materials have been investigated. Dissolving pulp has been treated with a monocomponent endoglucanase. Fock's method, a microscale process similar to the viscose process, showed an increase in cellulose yield. Simultaneously, the viscosity decreased. To clarify whether the increase in reactivity was due solely to the decrease in the degree of polymerization, the dissolving pulp was also subjected to acid hydrolysis. At a given viscosity level, the enzymatic pretreated pulp had a higher reactivity than the pulp subjected to acid hydrolysis. To achieve 100% reactivity, according to Fock, the acid-treated pulp showed a lower molecular weight compared to the enzymatic-treated pulp. A monocomponent endoglucanase can thus be used to increase the reactivity and accessibility of dissolving pulp in the viscose process.
高可及性是纤维素材料均匀取代的必要前提。在本研究中，对提高纤维素材料可及性的化学和酶预处理进行了研究。溶解浆已用单组分内切葡聚糖酶处理。福克法是一种类似于粘胶工艺的微观工艺，其纤维素产率有所提高。同时，粘度降低。为了阐明反应性的提高是否仅归因于聚合度的降低，溶解浆也进行了酸水解。在给定的粘度水平下，酶预处理浆比酸水解浆具有更高的反应性。根据福克的说法，为了达到100%的反应性，酸处理浆与酶处理浆相比显示出更低的分子量。因此，单组分内切葡聚糖酶可用于提高粘胶工艺中溶解浆的反应性和可及性。
