Preparation of yogurt powder and study on its restoration
Yogurt powder contains the same nutrients as yogurt,and has the advantages for easily carrying and transporting as well as long shelf life. The objectives of this study were to produce yogurt powder by using spray drying,and to optimize the restoration conditions for using yogurt powder. Various quantities,water temperatures,and stabilizers were tested for restoration by single factor or orthogonal design. The results showed that 15%～20% of yogurt powder at 37～45 ℃ had high solubility. Addition of 0.20% CMC-Na,0.15% kara gum,or 0.20% guar gum showed the best performance for viscosity. Orthogonal design test indicated that the optimal combination for yogurt powder restoration was addition of 0.10% CMC-Na,0.05% kara gum and 0.15% guar gum.