Cryopresevation in 40%v/v glycerol at -80°C has never dissapointed me in storing microbial samples. I would suggested that you revive the microbial culture in liquid medium followed by cryopresevation. I hope this will help

You just grow in MRS+0.05% cyteine-HCl for o/n and do as what Dr. Mekuto suggested in glycerol at -80C. Good luck..

Bifidobacteria (sic) Befidum (sic sic)

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Bifidobacterium bifidum

You can store it as a powder or after subculture in glass beads

Also you can store it in skim milk powder

You can store it grow in MRS+0.05% cyteine-HCl for o/n