Revival and Growth of Lactic Acid Bacteria

Begin with a frozen glycerol stock of lactic acid bacteria, anaerobic microbes that grow without oxygen.

Freezing exposes the bacteria to cold-induced stress, reducing their cellular function.

Vortex the tube to resuspend the cells, and transfer an aliquot into a nutrient broth. Incubate under anaerobic conditions.

In this environment, the bacteria generate energy through anaerobic metabolism, which supports their recovery and restores cellular activity.

Transfer the culture to a fresh broth to provide renewed nutrients for rapid cell division.

Actively growing cells acidify the medium, indicating their recovery and growth.

Streak the culture onto agar plates. Incubate under anaerobic conditions to support bacterial growth.

Metabolically active cells form visible colonies, while damaged or inactive ones fail to grow.

Transfer the isolated colonies into a fresh broth, vortex, and incubate anaerobically to attain a pure, high-performing culture.

This method restores viable cells for downstream applications.

Take the prepared glycerol stock of lactic acid bacteria, or LAB strains, in two milliliters centrifuge tubes from the minus 80 degree Celsius ultralow freezer.

Do not allow them to thaw bef