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Food Technology and Biotechnology, Vol.52 No.4 December 2014. -

Batch fermentation of milk inoculated with lactic acid bacteria was conducted in the presence of hydrotalcite-type anionic clay under static and ultrasonic conditions. An experimental study of the effect of fermentation temperature t=38–43 °C, clay-milk ratio R=1–7.5 g-L and ultrasonic field ν=0 and 35 kHz on process dynamics was performed. A mathematical model was selected to describe the fermentation process kinetics and its parameters were estimated based on experimental data. A good agreement between the experimental and simulated results was achieved. Consequently, the model can be employed to predict the dynamics of batch lactic acid fermentation with values of process variables in the studied ranges. A statistical analysis of the data based on a 23 factorial experiment was performed in order to express experimental and model-regressed process responses depending on t, R and ν factors.

anionic clay; fermentation; lactic acid; mass transfer; modelling; ultrasound

Autor: Cosmin Jinescu - ; Politehnica University of Bucharest, Mechanical Engineering Department, 313 Splaiul Independenţei, RO-060042



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