Inhibitory effect of essential oil of Mentha spicata on the viability of probiotic bacteria in industrial liquid Kashk

Mentha spicata is one of the geniuses of Lamiaceae family antimicrobial properties ofextract and essence of this plant on different microbes was tested and approved. The purpose of this study was surveying inhibitory effect of essence for Mentha spicata on the viability of probiotic bacteria in industrial liquid kashk.For this purpose, inhibitory effect of essential oil of Sarsem in two concentrations of 1500 and 2500 ppm on the viability of probiotic bacteria (Lactobacillus reuteri and Bifidobacterium animalis subsp. Lactis) in industrial liquid Kashk was examined during 20 days shelf life in 4°C. The obtained results showed that during the maintenance period and in comparison with control sample, Lactobacillus reuteri in both oil concentration was more sensitive than Bifidobacterium. Inhibition of bacterial growth at 1500 ppm concentration of oil was less than the other concentrations, and most probiotic bacteria survival after the control sample was observed for Bifidobacterium at 1500 ppm concentration of essential oil.