Acceleration of yoghurt fermentation time by yeast extract and partial characterisation of the active components
Esti-Andrine Smith1, Jacobus Myburgh1, Gernot Osthoff1
1Department of Microbial, Biochemical and Food Biotechnology, Faculty of Natural and Agricultural Science,University of the Free State,✉ 339 Bloemfontein, 9300,Republic of South Africa.
Abstract:
Water soluble autolysate of yeast, usually utilised for microbial growth support, was used as additive in yoghurt fermentation. The yeast extract (YE) resulted in a decrease of fermentation time by 21% to reach a pH of 4·6. However, the YE resulted in unacceptable flavour and taste. By size exclusion chromatography, a fraction of the YE was obtained that could account for the observed 21% decrease in fermentation time. The fraction contained molecules of low molecular weight, consisting of minerals, free amino acids and peptides. The acceleration of the yoghurt fermentation was ascribed to the short peptides in the fraction. It is proposed that the application of this extract in industrial yoghurt manufacture would result in savings for both the industry and the consumer.
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