Other

Agency of Industrial Science and Technology

Murata Kikai Kabushiki Kaisha

Hokkaido University

Nippon Suisan Kaisha, Ltd.

Seiichi Tokura

Ichiro Azuma

Ikuo Saiki

Norio Nishi

Shinichiro Nishimura

Tsuyoshi Koriyama

Yoshiyuki Chiba

Masashi Nishiyama

Mikio Satake

Hiroshi Seo

A polypeptide comprising repeated amino acid sequences of a cell-adhesive protein represented by the formula:

Polypeptide comprising repeated cell-adhesive core sequences

A novel squid chitin formed material is disclosed. Squid chitin is prepared by pulverizing squid crust and treating the pulverized chitin with caustic soda and then with hydrochloric acid to remove proteins and ashes. Squid chitin formed material such as sheet or fiber is then prepared by a freeze-defrost treatment. The squid chitin sheet and fiber have better physical properties than conventional crab chitin formed materials in terms of strength and folding endurance.

Squid chitin formed material

A slow-releasing preparation comprises porous granules of deacetylated chitin as a carrier and a physiologically active substance contained in the granules. The slow-releasing prepartion can be embedded in a body for curing diseases.

Slow-releasing preparation

The invention provides a novel method for making paper of regenerated chious fibers without the use of any binder materials. By virtue of the inherent physiological inertness of the chitinous fibers and the absence of any binder materials, the paper obtained by the inventive method is advantageously used in medical treatment in contact with living body tissues. The principle of the method is that the chitinous fibers prepared by a wet spinning process are never brought into a dry condition or always kept wet with water down to the step of sheet making so that the self-bonding power of the fibers by the hydrogen bonding is never decreased and a chitinous paper with sufficient strengths can be prepared without a binder material. Alternatively, once dried chitinous fibers can be treated with a hydrogen-bond forming agent, e.g. urea, so that the sheet making is equally successful without the use of a binder material.

Paper-making process with regenerated chitin fibers

Growing community of inventors

Sapporo, Japan

Seiichi Tokura