Abstract
n this study, the effect of ultrasound on the viability of different probiotic lactobacilli species (Lactobacillus acidophilus, Lactobacillus casei, Lactobacillus rhamnosus GG) was investigated. In addition, the effect of ultrasound application on the fermentation time was determined. For this purpose, first 400 W ultrasound was applied to the milk for 15 minutes, and after the culture addition, 100 W ultrasound was applied for 5 minutes, then the fermentation time was determined, and the probiotic bacteria count was performed in the yogurt-like probiotic fermented milk product obtained. As a result of the study, it was determined that the application of ultrasound shortened the fermentation time in the samples inoculated with L. acidophilus and L. casei, and increased the viability of L. acidophilus, L. casei and L. rhamnosus GG probiotic bacteria. These results show that the ultrasound application is promising in dairy technology and has the potential to be used in the production of probiotic fermented milk products.