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. 18, 1981
Filed:
Nov. 13, 1979
CPC International Inc., Englewood Cliffs, NJ (US);
Abstract
Heat and acid-stable alpha-amylase enzymes having the following characteristics: (1) capable of retaining at least about 70% of their initial activity when held at 90.degree. C. and at a pH of 6.0 for 10 minutes in the absence of calcium ion; (2) capable of retaining at least about 50% of their initial activity when held at 90.degree. C. at a pH of 6.0 for 60 minutes in the absence of added calcium ion; and/or (3) capable of retaining at least about 50% of their initial activity at a temperature of 80.degree. C. and at a pH of 4.5 in the presence of 5 mM calcium ion for 10 minutes. The preferred alpha-amylases are prepared by culturing a strain of a Bacillus stearothermophilus microorganism in a suitable culture medium. The novel alpha-amylases are useful in hydrolyzing and/or liquefying starch and due to their stability at low pH values they can be used in conjunction with other acid stable amylases such as gluco-amylase in either a soluble or an immobilized form.