.beta.-galactosidase from Thermus sp
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United States of America Patent
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Feb 1, 1994
Issued Date -
N/A
app pub date -
Aug 9, 1991
filing date -
Feb 9, 1987
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Abstract
A .beta.-galactosidase having a high thermostability is produced by Thermus sp. FERM BP-1678, FERM BP-1679, and FERM BP-1680. The .beta.-galactosidase has an optimum temperature of 75 to 85 degrees celsius, and an optimum pH of 4.5 to 6.5 and an enzymatic activity which is not lowered substantially by 50 mM each of galactose and glucose. The .beta.-galactosidase is used to hydrolyze lactose in foods, such as milk, at a high temperature at which the putrefaction by saprophytes is difficult.
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