Spray drying of low-phenylalanine skim milk: Optimisation of process conditions for improving solubility and particle size
Mohammad A. Mohammadifar
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The optimisation of the spray drying process for low-phenylalanine skim milk as a dietary supplement for phenylketonurics was studied. The effects of basic parameters including the inlet air temperature (100, 150 and 200°C), feed flow rate (5, 10 and 15mLmin -1 ) and air flow rate (400, 600 and 800Lh -1 ) on the solubility and particle size of the low-phenylalanine skim milk powder were determined using response surface methodology. The optimum conditions have been obtained with inlet air temperature of 133°C, feed flow rate of 5mLmin -1 , and air flow rate of 800Lh -1 . With the optimum parameters, the predicted values for the solubility and mean diameter were 95.33% and 5.34μm, respectively, and experimentally were 94.36±1.62% and 5.50±0.44μm, respectively. The experimental and predictive values were closely related showing predictive accuracy of the models. © 2011 The Authors. International Journal of Food Science and Technology © 2011 Institute of Food Science and Technology.