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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/4960

Title: Macroscopic birefringence in liquid crystals from novel cyanobacterial polysaccharide with an extremely high molecular weight
Authors: Okajima-Kaneko, Maiko
Hayasaka-Kaneko, Daisaku
Miyazato, Shinji
Kaneko, Tatsuo
Issue Date: 2007-05
Publisher: International Society for Optical Engineering (SPIE)
Magazine name: Proceedings of SPIE
Volume: 6587
Start page: 658711
DOI: 10.1117/12.722235
Abstract: We report an efficient method for extraction of anionic polysaccharides (PS) from cyanobacteria, Aphanothece sacrum; we used a hot alkaline solution (0.01 N NaOH) as an elution solvent in the first step of the extraction and isopropanol as a precipitation solvent in the last step. Thin fibers of PS were obtained at a high yield (50-80 % to the weight of the raw cyanobacterial sample). The spectroscopy and elemental analyses indicated the PS contains fucose, uronic acids (14.2 % by a carbazole-sulfuric acid method), a sugar unit containing amides. The solution of PS with a concentration of 1 wt% showed a very high viscosity (80 000cps) implying a high molecular weight, and a strong macroscopic birefringence with a texture typical of nematic liquid crystals was confirmed by crossed-polarizing microscopy (more than 0.5 wt%). The PS from A. sacrum may form a special structure rigid-rod enough to show LC phase and macroscopic birefringence.
Rights: Copyright 2007 Society of Photo-Optical Instrumentation Engineers. This paper was published in Maiko Okajima-Kaneko, Daisaku Hayasaka-Kaneko, Shinji Miyazato and Tatsuo Kaneko, Proceedings of SPIE, 6587, 2007, 658711 and is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
URI: http://hdl.handle.net/10119/4960
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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