Survival and activity of selected probiotic organisms in set-type yoghurt during cold storage
2007
Donkor, O.N. | Nilmini, S.L.I. | Stolic, P. | Vasiljevic, T. | Shah, N.P.
The growth and metabolism of two probiotic organisms (L. acidophilus LAFTI L10 and Lactobacillus casei LAFTI L26) and a regular yoghurt culture (L. delbrueckii ssp. bulgaricus Lb1466 and Streptococcus thermophilus St1342) were studied in yoghurt containing 0.5%, 1.0%, and 1.5% (w/v) of high amylose corn starch powder (Hi-maize) or inulin. Viable cell counts of probiotic organisms, their metabolites and proteolytic activities, and viscosity of the yoghurts were determined during refrigerated storage for 28 d at 4 oC. In the presence of inulin, cultures showed better retention of viability (8.0 log cfu g-1) in comparison with that of Hi-maize, which had a reduction by one log cycle. Lower concentrations of 0.5-1.0% Hi-maize improved (P<0.05) the production of propionic acid and also increased proteolytic activity of probiotic organisms substantially. A greater release of free amino acids may have sustained better growth of the organisms in yoghurts. Supplementation with either Hi-maize or inulin increased the viscosity of probiotic yoghurts significantly (P<0.05).
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