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:
Nov. 08, 2011
Filed:
Apr. 12, 2006
Jinmai Xiao, Chongqing, CN;
Jie Deng, Chongqing, CN;
Jinhua Feng, Chongqing, CN;
BO Xiao, Chongqing, CN;
Jinmai Xiao, Chongqing, CN;
Jie Deng, Chongqing, CN;
Jinhua Feng, Chongqing, CN;
Bo Xiao, Chongqing, CN;
Chongqing Pharmaceutical Research Institute Co., Ltd., Chongqing, CN;
Abstract
The invention discloses a process for preparing a polynuclear ferric hydroxide-saccharide complex, including: adding an aqueous solution of an alkaline substance drop-wise into an aqueous solution of iron salt at a temperature of 5-20° C. until pH 6-8, collecting the polynuclear ferric hydroxide from the reaction mixture by a conventional method; reacting the polynuclear ferric hydroxide with a saccharide in a solution of an alkaline substance for 10-40 hours at 106-125° C. under pH 10-12, resulting in a crude product having an isoelectric point of 4.4-5.3 and a weight average molecular weight of 20,000-100,000 Daltons, and then harvesting the polynuclear ferric hydroxide-saccharide complex from the crude product. The process can precisely control the molecular weight of the polynuclear ferric hydroxide-saccharide complex without an effect on the other characteristics of the product, for example its saccharide content or isoelectric point etc. Furthermore, it is very simple and readily applicable in industry.