Biodegradation of Chitosan-Gellan and Poly(L-lysine)-Gellan Polyion Complex Fibers by Pure Cultures of Soil Filamentous Fungi |
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| Authors: | Kousaku Ohkawa Masanori Yamada Ayako Nishida Norio Nishi Hiroyuki Yamamoto |
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| Institution: | (1) Institute of High Polymer Research, Faculty of Textile Science and Technology, Shinshu University, Tokida 3-15-1, Ueda, Nagano, 386-8567, Japan;(2) Institute of High Polymer Research, Faculty of Textile Science and Technology, Shinshu University, Tokida 3-15-1, Ueda, Nagano, 386-8567, Japan;(3) Division of Bioscience, Graduate School of Environmental Earth Science, Hokkaido University, N10 W5, Sapporo, 060-0810, Japan |
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| Abstract: | The degradation of two kinds of polyion complex (PIC) fibers, chitosan-gellan (CGF), and poly(L-lysine)-gellan (LGF) fibers, by seven species of soil filamentous fungi has been investigated. All of the pure-line soil filamentous fungi, Aspergillus oryzae, Penicillium caseicolum, P. citrinum, Mucor sp., Rhizopus sp., Curvularia sp., and Cladosporium sp. grew on the two fiber materials. Microscopic observation of the biodegradation processes revealed that P. caseicolum on the CGF and LGF grew, along with the accompanying collapse of the fiber matrices. In the biochemical oxygen-demand (BOD) test, the biodegradation of the LGF by P. caseicolum and Curvularia sp. exceeded 97% carbon dioxide generation and the biodegradation of the CGF by A. oryzae was 59%. These results might offer some clues to the applications of the PIC fibers as environmentally biodegradable materials. |
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| Keywords: | Polyion complex fibers biodegradation soil filamentous fungi chitosan poly(L-lysine) gellan |
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