Bacterial and plant cellulose modification using ultrasound irradiation

This study indicates that controlled depolymerization of plant (PC) and bacterial (BC) celluloses can be achieved by employing suitable ultrasonication settings. Size exclusion chromatography results indicate that reduction in the molecular weight of the two polymers was accompanied by a parallel drop in the polydispersity index of PC and an unexpected increase in the said index of BC. X-ray diffraction patterns of the fractionated materials were found to be Cellulose II crystals whereas experimentation on microcrystalline cellulose unveiled the Cellulose I conformation. The crystallinity index revealed no obvious changes in PC as a function of the time of sonication whereas a major increase in the crystalline component was encountered for BC. Furthermore, thermal degradation using TGA and FTIR spectra suggest that the processes of dissolution and regeneration in cuprammonium hydroxide of PC and BC followed by ultrasonication do not affect the chemical fingerprints via oxidative reactions of the cellulosic materials.

[1]  Enyong Ding,et al.  Thermal degradation behaviors of spherical cellulose nanocrystals with sulfate groups , 2007 .

[2]  N. Gilkes,et al.  Changes in the molecular-size distribution of insoluble celluloses by the action of recombinant Cellulomonas fimi cellulases. , 1994, The Biochemical journal.

[3]  Huimin Tan,et al.  Structural characterization of cellulose with enzymatic treatment , 2004 .

[4]  J. Weiss,et al.  Molecular weight and degree of acetylation of high-intensity ultrasonicated chitosan , 2005 .

[5]  G. Price,et al.  Control of polymer structure using power ultrasound , 1994 .

[6]  A. Striegel.  Influence of anomeric configuration on mechanochemical degradation of polysaccharides: cellulose versus amylose. , 2007, Biomacromolecules.

[7]  R. Brown,et al.  Acid hydrolysis behaviour of microbial cellulose II , 1995 .

[8]  Timothy J. Mason,et al.  Effect of ultrasound on the degradation of aqueous native dextran , 1995 .

[9]  A. Varma,et al.  Thermal properties of oxidized cellulose , 1995, Cellulose.

[10]  R. Chen,et al.  Effects of ultrasonic conditions and storage in acidic solutions on changes in molecular weight and polydispersity of treated chitosan , 1997 .

[11]  T. Kondo,et al.  Periodate oxidation of crystalline cellulose. , 2000, Biomacromolecules.

[12]  S. Kuga,et al.  Mercerization and acid hydrolysis of bacterial cellulose , 1997 .

[13]  T. Mason,et al.  Applied Sonochemistry: The Uses of Power Ultrasound in Chemistry and Processing , 2002 .

[14]  C. Lii,et al.  Preliminary study on the degradation kinetics of agarose and carrageenans by ultrasound , 1999 .

[15]  A. Tayal,et al.  Degradation of a Water-Soluble Polymer: Molecular Weight Changes and Chain Scission Characteristics , 2000 .

[16]  A. Dupont.  Cellulose in lithium chloride/N,N-dimethylacetamide, optimisation of a dissolution method using paper substrates and stability of the solutions , 2003 .

[17]  W. Park,et al.  Crystalline structure analysis of cellulose treated with sodium hydroxide and carbon dioxide by means of X-ray diffraction and FTIR spectroscopy. , 2005, Carbohydrate research.

[18]  M. El-Sakhawy,et al.  Physical and mechanical properties of microcrystalline cellulose prepared from agricultural residues. , 2007 .

[19]  Calvin Woodings,et al.  Regenerated cellulose fibres , 2001 .

[20]  P. Pirkonen,et al.  Ultrasonic depolymerization of aqueous carboxymethylcellulose. , 2004, Ultrasonics sonochemistry.

[21]  K. Okajima,et al.  Studies on Structure of Cuprammonium Cellulose III. Structure of Regenerated Cellulose Treated by Cuprammonium Solution , 1996 .

[22]  M. Marx‐Figini.  Studies on the ultrasonic degradation of cellulose macromolecular properties , 1997 .

[23]  Hiroyuki Yamamoto,et al.  Structural studies of bacterial cellulose through the solid-phase nitration and acetylation by CP/MAS 13C NMR spectroscopy , 2006 .

[24]  F. Carrillo,et al.  Structural FTIR analysis and thermal characterisation of lyocell and viscose-type fibres , 2004 .

[25]  G. Ĉoté,et al.  Thermomechanical depolymerization of dextran , 1999 .

[26]  J. Kennedy,et al.  Effect of ultrasonic treatment on the biochemphysical properties of chitosan , 2006 .

[27]  G Portenlänger,et al.  The influence of frequency on the mechanical and radical effects for the ultrasonic degradation of dextranes. , 1997, Ultrasonics sonochemistry.

[28]  W. Park,et al.  Preparation of ultrafine oxidized cellulose mats via electrospinning. , 2004, Biomacromolecules.

[29]  D. Klemm,et al.  Cellulose: fascinating biopolymer and sustainable raw material. , 2005, Angewandte Chemie.