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. 05, 1991
Filed:
Apr. 06, 1989
Larry U Tan, Mississauga, CA;
Dirk Alkema, Stayner, CA;
Gail Jackson, Richmond Hill, CA;
Po S Wah, Willowdale, CA;
Connaught Laboratories Limited, Willowdale, CA;
Abstract
Lymphocytosis promoting factor (LPF) and filamentous hemaglutinin (FHA) are isolated from the growth medium of the Bordatella pertussis organism and purified by selecting adsorbing the LPF and FHA on a selective adsorbing medium, such as filter aids or gel filtration media, at low ionic strength and subsequently removing the adsorbed LPF and FHA at using an aqueous medium of high ionic strength, either simultaneously or sequentially. Prior to desorbtion of the LPF and FHA, the adsorbing medium may be contacted with an aqueous solution of a non-ionic detergent, which enables the LPF and FHA subsequently desorbed to be substantially free from contamination by lipopolysaccharides (LPS). The LPF and FHA may be further purified on hydroxyapatite. The LPF and FHA may be detoxified separately or together by contacting with a cross-linking agent, such as glutaraldehyde or formaldehyde, in the presence of an anti-aggregation agent. The resulting purified and detoxified LPF and FHA may be used to formulate a vaccine against pertussis.