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The retention of β-galactosidase activity in crude cellular extract (CCE) preparations from Lactobacillus delbrueckii subsp. bulgaricus ATCC 11842 was investigated after spray drying at three different outlet air temperatures (40, 50 or 60 o C), freeze drying, and after 30 days storage. Lactose, skim milk and whey protein preparations in concentrations ranging from 5 to 30% (w/w) were used...
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