FOOD. Science. Technology. Quality

Food. SCIENCE. Technology. Quality

Food. Science. TECHNOLOGY. Quality

Food. Science. Technology. QUALITY

Authors

ANNA MITUNIEWICZ-MAŁEK, MAŁGORZATA ZIARNO, IZABELA DMYTRÓW

Title

Application of frozen goat’s milk to production of potentially probiotic fermented drink

Abstract

The objective of the research study was to asses the selected qualitative characteristics of potentially probiotic fermented drinks made from goat’s milk that was, first, frozen, and, next, defrozen prior to fermentation using two separate sets of probiotic monocultures, during a 3-week storage (5 ± 1 ºC). Two experimental products were produced: one using a Lactobacillus acidophilus La-5 strain and the second using a Bb-12 Bifidobacterium animalis subsp. lactis strain. To enable comparison, a yoghurt with YCX16, a traditional yoghurt culture, was produced. The experimental drinks were sensory assessed and their physiochemical properties were evaluated after the 1st, 7th, 14th and 21st day of storage under the cooling conditions (5 ± 1 ºC). Additionally, in the products obtained using probiotic monocultures, the count of bacteria was determined. On the basis of the results obtained, it was confirmed that the goat’s milk, stored under the frozen conditions, could be used to produce fermented milk drinks with probiotics. The sensory features of the fermented drinks were highly rated and their psychochemical features analysed (titratable acidity, pH, acetaldehyde content, and texture of curds) depended on the type of drink and the time of cooling storage. In the samples of the potentially probiotic fermented drinks, the number of cells exceeded 1.2×10cfu/g; therefore, the therapeutic minimum, defined by FAO/WHO to be 10cfu/g, was met in relation to probiotic bacteria.

Keywords

frozen goat’s milk, fermented drinks, probiotics, physiochemical properties

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