Document Detail


Preparation and characterization of enzyme-modified konjac glucomannan/xanthan blend films.
MedLine Citation:
PMID:  19192357     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Enzyme-modified konjac glucomannan (KGM) and xanthan blend films have been prepared and characterized. Enzymatic hydrolysis of purified KGM by beta-mannanase yielded samples of various weight-average molecular weight (M(w)) that were determined by size-exclusion chromatography coupled with multi-angle laser light scattering (SEC-MALLS) and calculated using the established Mark-Houwink-Sakurada equation [eta] = 4.07 x 10(-4)M(w)(0.733). KGM degradation products were blended with xanthan for preparation of films that were used in orthogonal-designed experiments. These films were characterized in terms of their structures, thermal stability, crystallinities and mechanical properties. The results of Fourier transform infrared spectroscopy indicated that, after blending, there was strong intermolecular interaction caused by hydrogen bonds between xanthan and KGM hydrolysates. This phenomenon was more marked at lower M(w) of KGM. The thermal stability of the blend films determined by differential scanning calorimetry was higher with increasing KGM molecular weight. The degrees of crystallinity characterized by X-ray diffraction (XRD) decreased with the increasing content of non-degraded KGM. Mechanical properties of the polymer blends including the tensile strength and elongation rate were also correlated to M(w) of KGM. The tensile strength achieved a maximum at 10.25 MPa with KGM of M(w) = 4.25 x 10(5) and the elongation rate reached a maximum value of 89.5% with KGM of M(w) = 8.95 x 10(5). These results were directly attributed to intermolecular interactions between xanthan and KGM, and this synergistic behavior led to good physicochemical and mechanical performance of the blended films.
Authors:
Qiujin Li; Wei Qi; Rongxin Su; Zhimin He
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of biomaterials science. Polymer edition     Volume:  20     ISSN:  0920-5063     ISO Abbreviation:  J Biomater Sci Polym Ed     Publication Date:  2009  
Date Detail:
Created Date:  2009-02-04     Completed Date:  2009-07-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9007393     Medline TA:  J Biomater Sci Polym Ed     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  299-310     Citation Subset:  IM    
Affiliation:
Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China.
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MeSH Terms
Descriptor/Qualifier:
Chromatography / methods
Hydrogen Bonding
Hydrolysis
Mannans / chemical synthesis*
Molecular Weight
Polysaccharides, Bacterial / chemistry*
Powders
Pressure
Spectrophotometry, Infrared
Spectroscopy, Fourier Transform Infrared / methods
Temperature
Tensile Strength
Viscosity
X-Ray Diffraction
beta-Mannosidase / chemistry
Chemical
Reg. No./Substance:
0/Mannans; 0/Polysaccharides, Bacterial; 0/Powders; 0/konjac gluco-mannan; 11138-66-2/xanthan gum; EC 3.2.1.25/beta-Mannosidase

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