Determination of the Activity of the Enzyme B-galactosidase by Lactose Whey Cheese
DOI:
https://doi.org/10.5433/2316-5200.2012v1n2p28Keywords:
Whey, B-galactosidase specific activity and thermal stability.Abstract
The enzyme B-galactosidase is used in the hydrolysis of lactose, which are produced from lactose present in the whey, glucose and galactose, and can be also produced some oligosaccharides such as galacto-oligosaccharides (GOS) which are nondigestible sugars, ensuring foods with a low lactose content, improving the solubility and digestibility of milk and derivatives. The objective of this study was to determine the specific activity ofthe enzyme as a function of pH and temperature and its thermal stability, for later use in the synthesis of galacto-oligosaccharides (GOS). By the tests carried out, the maximum activity of the enzyme was at pH 6.5 and 45 °C and it reached 2.67 U/mg of protein, although the enzyme was most stable at 40 °C. At this temperature the enzyme reached 2.35 U/mg of protein, only 1.1 times lower than 45 °C, so their use is more feasible at 40 °C.Downloads
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Published
2013-03-25
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Section
Artigos Científicos