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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9732125 B1

PDFFull Text
Date of Patent:
Aug. 15, 2017

Filed:

Apr. 18, 2014

Polypeptide particle and method for producing same

Applicant:

Spiber Inc., Tsuruoka-shi, Yamagata, JP;

Inventors:

Toshiaki Osawa, Tsuruoka, JP;

Keisuke Morita, Tsuruoka, JP;

Assignee:

SPIBER INC., Yamagata, JP;

Attorney:

Hamre, Schumann, Mueller & Larson, P.C.

Primary Examiner:

Anand Desai

Int. Cl.
CPC ...
C07K 14/435 (2006.01); A61K 8/64 (2006.01); A61K 8/42 (2006.01); A61K 8/46 (2006.01); A61Q 19/00 (2006.01); A61K 8/02 (2006.01); C08J 3/12 (2006.01); C08L 89/00 (2006.01); C09D 7/12 (2006.01); C08J 3/05 (2006.01); C08J 3/07 (2006.01); A61K 47/42 (2017.01); A61K 9/51 (2006.01);
U.S. Cl.
CPC ...
C07K 14/43518 (2013.01); A61K 8/0279 (2013.01); A61K 8/42 (2013.01); A61K 8/46 (2013.01); A61K 8/64 (2013.01); A61Q 19/00 (2013.01); C08J 3/05 (2013.01); C08J 3/07 (2013.01); C08J 3/12 (2013.01); C08L 89/00 (2013.01); C09D 7/125 (2013.01); C09D 7/1275 (2013.01); A61K 9/5169 (2013.01); A61K 47/42 (2013.01); A61K 2800/412 (2013.01); A61K 2800/56 (2013.01); A61K 2800/84 (2013.01); C08J 2389/00 (2013.01);
Abstract

Polypeptide particles of the present invention are particles of a polypeptide derived from spider silk proteins, and have an average particle size of 1000 nm or less. A method for producing polypeptide particles of the present invention includes: a solution production step in which the polypeptide is dissolved in at least one solvent selected from the group consisting of DMSO, DMF, and these with an inorganic salt, so as to obtain a solution of the polypeptide; a step in which the solution produced in the solution production step is substituted with a water-soluble solvent so as to obtain an aqueous solution of the polypeptide; and a step in which the aqueous solution of the polypeptide is dried. Thereby, the present invention provides polypeptide particles suitable for application to a living body and capable of being applied to cosmetics, etc., while identifying the properties of the polypeptide particles, and a method for producing the same.

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