Distribution & Access For Publication Downloads News About Us Contact Us
Paper Titles
Study of the Fosfosal Controlled Permeation through Glutaraldehyde Crosslinked Chitosan Membranes
p.990
Enzymatic Degradation Behaviour of Starch Conjugated Phosphorylated Chitosan
p.995
Physicochemical Characterization of Novel Chitosan-Soy Protein/ TEOS Porous Hybrids for Tissue Engineering Applications
p.1000
Preparation and Characterization of Chitosan-Based Scaffolds for Biomedical Applications
p.1005
Liquid Crystalline Behaviour of Chitosan in Formic, Acetic, Monochloroacetic Acid Solutions
p.1010
Synthesis of N-Carboxymethyl Chitosan Beads for Controlled Drug Delivery Applications
p.1015
Influence of Molecular Weight and Crystallinity of Poly(L-Lactic Acid) on the Adhesion and Proliferation of Human Osteoblast Like Cells
p.1020
Optimization of the Synthesis of Hydroxyapatite Powders for Biomedical Applications Using Taguchi's Method
p.1025
Influence of Substrate Temperature in Plasma Assisted Pulsed Laser Deposition of Hydroxyapatite Thin Films
p.1029

Liquid Crystalline Behaviour of Chitosan in Formic, Acetic, Monochloroacetic Acid Solutions

Article Preview

Abstract:

The objective of this work was to prepare polysaccharide-based gels exhibiting liquid crystalline properties. Such systems may be used in some optical or in biomedical applications, where biodegradability is required. Chitosan is a derivative of chitin, widely used in a series of medical applications. Due to its rigid structure, chitosan or its derivatives may show lyotropic mesophases in certain conditions. In this work, chitosan solutions were prepared by mixing completely the polysaccharide with different concentration of formic, acetic and monochloroacetic acids at room temperature. X-ray diffraction patterns of the gels did not show the existence of a crystalline structure. Finger-prints texture observed by polarised optical microscopy was attributed to a cholesteric liquid crystalline phase that usually develops in concentrated solutions. Values of the nematic chiral pitch (P) were determined in function of acid solution concentration. The critical concentrations (C*) to form a lyotropic liquid crystalline phase in formic, acetic and monochloroacetic acids were determined, and the obtained values were confronted with the expected critical concentration based on the Flory formalism. The critical concentration values were found to be dependent upon the acid used.

You might also be interested in these eBooks
Advanced Materials Forum III View Preview

Info:

Periodical:

Materials Science Forum (Volumes 514-516)

Pages:

1010-1014

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.514-516.1010

Citation:

Cite this paper

Online since:

May 2006

Authors:

Mani Prabaharan, João Paulo Borges, M.H. Godinho, João F. Mano

Keywords:

Birefringence, Chitosan (CS), Critical Concentration, Mesophase

Export:

RIS, BibTeX

Price:

Permissions:

Request Permissions

References

[1] M. N. V. Ravikumar: React. Funct. Polym Vol. 46 (2000), p.1.

Google Scholar

[2] M. Prabaharan and J. F. Mano: Drug Delivery Vol. 12 (2005), p.41.

Google Scholar

[3] W. Y. Chuang, T. H. Young, C. H. Yao and W. Y. Chiu: Biomaterials Vol. 20 (1999), p.1479.

Google Scholar

[4] M. Rinaudo and A. Dotard, Chitin and chitosan (Elsevier Applied Science, London 1989).

Google Scholar

[5] I. Uematsu and Y. Uematsu: Adv. Polym. Sci. Vol. 59 (1984), p.37.

Google Scholar

[6] J. D. Bernal and I. J. Fankuchen: Gen. Physiol. Vol. 25 (1941), p.111.

Google Scholar

[7] Y. M. Yevdokimv, S. G. Skuridin and V. L. Salyanov: Liq. Cryst. Vol. 3 (1988), p.1443.

Google Scholar

[8] C. Robinson: Tetrahedron Vol. 13 (1961), p.219.

Google Scholar

[9] S. W. Fuller, M. H. F. Wilkins and G. L. Brown: Nature Vol. 194 (1962), p.1014.

Google Scholar

[10] E. Iizuka: Polym. J. Vol. 9 (1977), p.173.

Google Scholar

[11] D. G. Gray: Appl. Polym. Symp. Vol. 37 (1983), p.179.

Google Scholar

[12] M. H. Godinho, J. G. Fonseca, A. C. Ribeiro, L. V. Melo and P. Brogueira: Macromolecules Vol. 35 (2002), p.5932.

Google Scholar

[13] K. Ogura, T. Kanamoto, T. Sannan, K. Tanaka and Y. Iwakura: 2nd Chitin chitosan proceeding International Conference (Tottori, Japan 1982).

Google Scholar

[14] M. Terbojevich, A. Cosani, G. Conio, E. Marsano and E. Bianchi: Carbohydr. Res. Vol. 209 (1991), p.251.

DOI: 10.1016/0008-6215(91)80161-f

Google Scholar

[15] D. K. Rout, S. K. Pulapura and R. A. Gross: Macromolecules Vol. 26 (1993), p.5999.

Google Scholar

[16] D. K. Rout, S. K. Pulapura and R. A. Gross: Macromolecules Vol. 26 (1993), p.6007.

Google Scholar

[17] D. K. Rout, S. P. Barman, S. K. Pulapura and R. A. Gross: Macromolecules Vol. 27 (1994), p.2945.

Google Scholar

[18] Y. Dong, Y. Wu, J. Wang and M. Wang: Eur. Polym. J. Vol. 37 (2001), p.1713.

Google Scholar

[19] Y. Wu, Y. Dong, L. Chen, J. Huang and J. Li: Macromol. Biosci. Vol. 2 (2002), p.131.

Google Scholar

[20] Y. Dong, H. Wang, W. Zheng, Y. Zhao, D. Bi, L. Zhao and X. Li : Carbohydr. Polym. Vol. 57 (2004), p.235.

Google Scholar

[21] Y. Dong, Q. Yuan, Y. Wu and M. Wang: J. Appl. Polym. Sci. Vol. 76 (2000), p. (2057).

Google Scholar

[22] D. J. S. Hulmes: J. Struct. Biol. Vol. 137 (2002), p.2.

Google Scholar

[23] P. J. Flory: Proc. Royal Soc. London, Ser. A Vol. 234 (1956), p.60.

Google Scholar

[24] R. M. Silva, C. Elvira, J. F. Mano, J. San Román and R. L. Reis: J. Mat. Sci. Mater. Med. Vol. 15 (2004), p.523.

Google Scholar

[25] C. Robinson, J. C. Ward and R. B. Beevers: Discuss Faraday Soc. Vol. 25 (1958), p.29.

Google Scholar

[26] Y. Onagi, J. White and J. Feller: J. Polym. Sci. Polym. Phys. Ed. Vol. 18 (1980), p.663.

Google Scholar

Scientific.Net is a registered brand of Trans Tech Publications Ltd
© 2024 by Trans Tech Publications Ltd. All Rights Reserved