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.:
Date of Patent:
Mar. 24, 1998
Filed:
May. 30, 1997
Hyang-Ja You, Nowon-ku, Seoul, KR;
Kil-Hyun Park, Kyungki-do, KR;
Yong-Ho Kim, Kwangju, KR;
Yong-Ju Kim, Kwangju, KR;
Jae-Hyeok Choi, Seoul, KR;
Seon-Jeong Kim, Seoul, KR;
Soon-Hong Lee, Chungnam, KR;
Other;
Abstract
A multi-step membrane separation process whereby the natural polymer .alpha.-chitosan extracted from the shell of crustaceans, etc. can be simply separated and purified into low molecular weight chitosan or oligosaccharide chitosan in a high yield. A chitosan mixture of various molecular weights is reacted with an acid in the presence of enzyme while applying an ultrasonic treatment to the mixture and then, added with pure water to give an aqueous solution having a chitosan concentration of 1 to 50%. It is subjected to a continuous membrane filtration under a pressure and further to a second fractionation and separation technique employing a proper membrane according to a desired molecular weight cut-off, at least one time.