In-house Production of Lactose-hydrolysed Milk by Beta-galactosidase from Lactobacillus bulgaricus
محل انتشار: مجله علوم و فناوری کشاورزی، دوره: 13، شماره: 4
سال انتشار: 1390
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 48
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شناسه ملی سند علمی:
JR_JASTMO-13-4_010
تاریخ نمایه سازی: 1 آذر 1402
چکیده مقاله:
Crude Enzyme (beta-galactosidase) Extract (CEE) was produced by Lactobacillus ssp.
bulgaricus CHR Hansen Lb-۱۲ and was applied in sterile milk which had been processed
through Ultra High Temperature method (UHT milk), for hydrolyzing lactose. Lactosehydrolyzed
milk was also produced by a pure and commercially available betagalactosidase
(Maxilact). Optimum quantities of CEE and Maxilact enzyme, for
producing lactose-hydrolyzed milk, during ۶ hours of processing, were ۰.۴۱۸ and ۰.۵۱۲ U
ml-۱, respectively. Using more than ۰.۴۱۸ U ml-۱ CEE resulted in unacceptable acidity.
Acidity of lactose-hydrolyzed milk produced through ۰.۴۱۸ U ml-۱ of CEE was
significantly increased from ۱۵ to ۱۷ ºD, while enhancement of acidity in lactosehydrolyzed
milk produced through Maxilact enzyme was not significant. Total count of
lactose-hydrolyzed milk by ۰.۴۱۸ U ml-۱ CEE, after ۶ hours of processing was significantly
increased from ۵ to ۳۰ CFU (Colony Forming Unit). Sensory evaluation of lactosehydrolyzed
milk and ordinary UHT milk (as control) did not show any significant
differences with respect to acceptability of sweetness, taste, aftertaste and color.
کلیدواژه ها:
نویسندگان
A. Jokar
Fars Research Center for Agriculture and Natural Resource, Zarghan, Shiraz, Islamic Republic Iran.
A. Karbassi
Department of Food Science, College of Agriculture, Shiraz University, Shiraz, Islamic Republic of Iran