发明名称 |
PROCEESS FOR OBTAINING THE HEAT AND ACID RESISTANT ALPHA-AMYLASE ENZYME |
摘要 |
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; (3) capable of retaining at least about 50% of their initial activity at a temperature of 80.degree.C and at a pH of 4.55 in the presence of 5mM calcium ion for 10 minutes; and/or (4) capable of retaining at least about 95% of their initial activity at a temperature of 80.degree.C at a pH ranging from about 4 to about 6.5. 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 glucoamylase in either a soluble or an immobilized form. |
申请公布号 |
YU40476(B) |
申请公布日期 |
1986.02.28 |
申请号 |
YU19770000998 |
申请日期 |
1977.04.15 |
申请人 |
CPC INT INC |
发明人 |
TAMURA M.;KANNO M.;ISHII Y. |
分类号 |
C12N1/00;C11D3/386;C12N9/28;C12P19/14 |
主分类号 |
C12N1/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|