发明名称 |
ENZIMAS DE ALFA-AMILASE ESTAVEIS AO CALOR E AOS ACIDOS,PROCESSO PARA SUA PRODUCAO E PROCESSO PARA A CONVERSAO DE AMIDO EM AMIDO HIDROLISADO PELO TRATAMENTO COM AS DITAS ENZIMAS |
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 |
BR7702475(A) |
申请公布日期 |
1978.05.02 |
申请号 |
BR19777702475 |
申请日期 |
1977.04.19 |
申请人 |
CPC INT INC |
发明人 |
KANNO M;ISHII Y;TAMURA M |
分类号 |
C12N1/00;C11D3/386;C12N9/28;C12P19/14 |
主分类号 |
C12N1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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