Creation and Practical Use of Multipurpose Hybrid Fibers from Natural Polymeric Materials by Watery Interfacial

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1.Exploring New Marine Adhesive Protein and its Molecular Structure : The adhesive protein of the green mussel Perna viridis was firstly purified. The molecular structure of the Perna viridis foot protein-1 (Pvfp-1) was characterized as a novel glycosylated protein. The other proteins, Pvfp-2, -3, -4, -5, -6, -7, -and -8 were also found as the byssus precursor protein, and some of them functions as the adhesives to male durable marine holdfast.2.Synthesis of photo-crosslinkable poly(amino acid)s by watery process and its application for hybrid fibers : Two kinds of cationic polypeptides, poly(L-lysine) (PLL) and poly(L-ornithine) (PLO) were treated to incorporate the photoreactive coumaryloxyacetyl groups into the side chain amino groups of the PLL and PLO. The resulting-coumarin-containing cationic polypeptides were spun into the PLC fibers with the anionic polysaccharide gellan in water. The mechanical strength of the coumarin-containing PIC fibers further increased upon light-irradi … More ation.3.Preparation of Biopolymer Hybrid Capsules Formed by Self-Assembly at an Aqueous Solution Interface : True spherical capsules are formed by electrostatic polysaccharide interaction between chitosan and gellan gum via polyion complex (PIC) formation in aqueous solutions. Dropwise addition of a chitosan solution into the gellan solution gave spherical capsules whose outside surface was gellan and whose inside was chitosan. The releasing properties of the capsules were examined using low molecular weight substances and high molecular weight proteins.4.Reinforced Fiber Material Inspired from the Byssogenous System of the Marine Mussel : The molecular mechanism involved in the byssogenous system of the marine mussels inspires the mew technology for creating a hybrid material in aqueous media. In a series of our studies to create the biomimetic hybrid fibers, capsules, hydrogels, and adhesives, we focused on the quinone-coupling chemistry, which occurs along with the byssus formation. The novel polysaccharide and poly(amino acid) derivatives were designed and synthesized. They have the grafted peptide side chap as the enzyme-mediated cross-linker, allowing the mechanical reinforcement of the hybrid materials. Less