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Spray freeze-drying (SFD) is a comparatively new method of producing biopharmaceutical powder preparations.In this study, Lactobacillus casei (IFO 15883) was spray freeze-dried to obtain a fine probioticpowder. The survival rate of L. casei in the powder after the SFD process was measured using plate agarcounting. To improve the survival rate of L. casei during the SFD process, various experimental conditionswere carried out. Among five growth media compositions, in Lactobacilli MRS broth with 1% mannose and0.1% CaCO3, the viability of the freeze-dried powder was not significantly different from that of the initialpowder (p > 0.05). The most effective air pressure and protective agent during SFD were 20 kPa and bufferedpeptone water (BPW), respectively. Scanning electron microscopy (SEM) was applied to estimatethe physical structure and properties of the particles. SFD probiotic particles were of various shapesand sizes with porous structures under different SFD conditions. The average diameter of optimizedprobiotic powder particles with annealing was 24.8 lm. The survival rate of the final SFD probioticpowder under conditions was 97.7%.
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