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:
Jul. 28, 1992
Filed:
Feb. 28, 1991
Noel Rouy, Yerres, FR;
Rhone-Poulenc Sante, , FR;
Abstract
A stable composition containing 35 to 48% lysine sulphate for animal nutrition is prepared by culturing a lysine-producing microorganism in a culture medium and adding sulfuric acid or ammonium sulphate during culturing to convert lysine as it is formed to lysine sulphate. The culture medium contains ammonia and ammonium sulphate, and a carbon source selected from glucose, sucrose and starch hydrolyzates in an amount such that the total weight ratio of fermentable substances/solids is greater than 80%. The concentration of the carbon source is maintained at 5 to 15 g/liter and ammonia is added during culturing to maintain an ammonium ion concentration of 1 to 5 g/liter. After allowing concentration of the carbon source to fall to less than 2 g/liter, culturing is stopped and the resultant cultured medium is concentrated and dried. The composition has good stability in moist air and preferably has a microporosity of about 0.3 cm.sup.3 /g and a surface area of about 0.5 m.sup.2 /g.