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On the supramolecular structure of cellulose allomorphs after enzymatic degradation

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în volumul unei conferinţe

Autori: Ciolacu, D.

Editorial: JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS, 9 (4), p.1033-1037, 2007.

Rezumat:

The variety of physical structures taken by cellulose molecules in their different crystalline forms is one structural feature of
cellulose that has not been examined systematically for its effect on biodegradation. In this paper was demonstrated that
the enzymatic degradation reaction of cellulose is adequate not only to demonstrate the influence of the physical structure
of the initial material on the heterogeneous reaction, but also to determine the influence of the modifications induced by the
chemical treatments of cellulose activation upon the enzymatic hydrolysis. The biodegradation of different celluloses by
Trichoderma reesei was investigated. Changes in supramolecular structure of cellulosic residues resulting from enzymatic
hydrolysis were established by X-ray diffraction method. The action of the exocellulosic components is demonstrated by the
reduction of the dimensions of crystallites for all the allomorphic forms that were studied. The study of X-ray diffractograms
show the fact that after biodegradation, the crystalline structure of allomorphic forms I and II does not suffer significant
modifications. For the polymorphic form of cellulose III, a partial return to the crystalline structure of cellulose I was
observed.

Cuvinte cheie: Enzymatic degradation, Trichoderma reesei, Cellulose Allomorphs, X-ray diffraction