Optimisation of a pilot‐scale spray drying process for probiotic yoghurt, using response surface methodology

Izadi, Masoumeh; Eskandari, Mohammad Hadi; Niakousari, Mehrdad; Shekarforoush, Shahram; Hanifpour, Mahammad Amin; Izadi, Zahra

Optimisation of a pilot‐scale spray drying process for probiotic yoghurt, using response surface methodology

2014

The influence of drying air temperatures, drying air flow rate and feed flow rate on percentage survival rate (% SR) of starter and probiotic bacteria, moisture content, water activity and colour of probiotic yoghurt powder produced using a pilot‐scale spray dryer was investigated. Optimisation of spray drying conditions was achieved based on the desirability value. Results showed that inlet air temperature, drying air flow rate, feed flow rate and outlet air temperature of 150 °C, 478 m³/h, 2 L/h and 63.3 °C, respectively, were optimal conditions to produce powder that meets quality specifications and with a satisfactory% SR.

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