Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 62, Issue 11
Displaying 1-10 of 10 articles from this issue
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  • Preparation and Properties of Composite Film Consisting of Human Hair Proteins and Silk Fibroin
    Toshihiro Fujii, Daisuke Ogiwara, Kazunori Matsuoka, Masanobu Nagura
    2006 Volume 62 Issue 11 Pages 245-250
    Published: 2006
    Released on J-STAGE: December 10, 2006
    DOIhttps://doi.org/10.2115/fiber.62.245
    JOURNAL FREE ACCESS
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    The technology of film production is important in the biomedical and cosmetics fields. We have developed convenient procedures for preparing human hair protein film mainly consisting of hard keratins. The mechanical strength of the hair protein films is too weak to use for practical application. Fibroin, a protein fiber synthesized in silkworm, can also form a film with higher mechanical strength. Thus, we prepared the composite films consisting of human hair proteins and silk fibroin. The composite films were translucent and became flexible in a wet state, and they formed a micro phase separation structure, which has each crystal of two protein components. The breaking stress of the composite films was gradually decreased with increasing content of hair proteins. Practical usage seems to be possible when the weight content of hair protein is lower than 70%. The UV-absorption around 270-295 nm wavelength and protease sensitivity of the hair protein film were higher than those of the fibroin film. The composite films exhibited the middle values for UV-absorption. Interestingly, the degradation of the films was dependent on the kinds of proteases used and on the constituent ratio of the two proteins. These results suggest that a simple mixing procedure can control the properties of the protein film including mechanical strength, UV-absorption, and protease sensitivity. Furthermore, the composite film can be customized for individuals, and for such a film the biocompatibility should be considered.
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  • Molecular Dynamics Simulation for β-1,3-D-Glucan in Aqueous Solutions : Attachment of One Side Chain Induces an Entire Structural Change
    Kentaro Miyoshi, Kazuya Uezu, Kazuo Sakurai, Seiji Shinkai
    2006 Volume 62 Issue 11 Pages 251-257
    Published: 2006
    Released on J-STAGE: December 10, 2006
    DOIhttps://doi.org/10.2115/fiber.62.251
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    β-1,3-D-glucans form a right-handed 61 triple helix in water, and some of them have side chains, generally, consisting of β-1,6-glucose. Since the side chains can provide hydrophilicity to the molecule, the conformation and other physical properties can be drastically changed by introducing the side chain. To understand the side chain effect from the molecular level, we attached one β-1,6 side chain to a β-1,3-D-glucan main chain consisting of 19 D-glucose units, and carried out molecular dynamics (MD) simulations in water. The calculation showed that the attachment of the side chain induced the change of helical pitch, hydrogen bonding type, and the bending of the main chain for β-1,3-D-glucan structure. The water molecules neighboring the side chain were bound with hydrogen bonds rather tightly and the mobility was more reduced than that of other waters molecules.
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  • Characterization of Morphology and Physical strength for Bacterial Cellulose Produced by an Enterobacter sp.
    Mariko Ago, Chihiro Yamane, Makiko Hattori, Hirofumi Ono, Kunihiko Oka ...
    2006 Volume 62 Issue 11 Pages 258-262
    Published: 2006
    Released on J-STAGE: December 10, 2006
    DOIhttps://doi.org/10.2115/fiber.62.258
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    An Enterobacter sp. produces a bacterial cellulose using glucose as a carbon source stably, even under agitating cultivation conditions. The optical microscopic observation on the bacterial cellulose from Enterobacter sp. under agitating conditions showed numerous fibrils one micrometer long radiating from central cellulose clumps with an average diameter of ca.3μm. The hydrolysis experiment on the bacterial cellulose with aids of AFM and X-ray analyses revealed that the strands of microfibrils of the bacterial cellulose were constituted of significant small particles with higher (1-10) plane orientation which promotes to form much entanglement between them by hydrogen bonding. Physical properties induced by such specific morphology of the bacterial cellulose were examined in sheet state. The bacterial cellulose sheet had considerably smaller pore distribution, judging from SEM observation, and revealed to have a potential ability to absorb organic solvent within the sheet. Here, commercially available bacterial cellulose was used just as a comparison about crystalline structure and some properties.
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  • Attempt of Contact-Type Dry Heat Fixation Method for Ink-Jet Printing
    Ryoko Yasukawa, Hidekazu Yasunaga, Hiroshi Urakawa
    2006 Volume 62 Issue 11 Pages 263-266
    Published: 2006
    Released on J-STAGE: December 10, 2006
    DOIhttps://doi.org/10.2115/fiber.62.263
    JOURNAL FREE ACCESS
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    The contact-type dry heat fixation (CDHF) method for fixing reactive dyes was developed, where dyed fabrics are placed between iron plates and heated. The dye fixation ratio obtained by CDHF method was estimated comparing with that by the steaming treatment. Cotton fabrics were dyed by ink-jet printing by use of three kinds of reactive dyes. The dye fixation time for the CDHF method is generally 60s to get an enough dye fixation ratio while that for the steaming treatment is 15min. The dye fixation ratio of the CDHF method is higher than that of the steaming treatment. The colour fastness of the CDHF method is as high as that of steaming treatment. The results show that the CDHF method is a powerful technique for the dye fixation of reactive dyes printed by the ink-jet method.
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