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:
Aug. 21, 1990
Filed:
Mar. 02, 1987
Roberta C Cheng, Midland, MI (US);
Norman G Moll, Sanford, MI (US);
Robert A Houtchens, Midland, MI (US);
Karen M McCoy, Midland, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
The subject invention concerns a process for stabilizing intact or ruptured microbial cells having glucose isomerase associated therewith. Specifically exemplified is a process for stabilizing glucose isomerase producing cells of a microorganism belonging to the genus Ampullariella. In the invention process the whole or ruptured microbial cells are contacted with a partially carboxyalkylated- or partially phosphonoalkylated-cationic polyelectrolyte, for example, a partially carboxymethylated polyethyleneimine to flocculate and stabilize the cells. The flocculated cells are further stabilized by encapsulation with a partially carboxyalkylated- or partially phosphonoalkylated-cationic polyelectrolyte. The encapsulation can be done prior to or after the flocculated cells are crosslinked. The net effect is manifested by a dramatic increase in the half-life of the glucose isomerase.