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Freeze-drying of Streptococcus thermophilus: a comparison between the vacuum and the atmospheric method
E Wolff1, B Delisle, G Corrieu
1I.N.R.A. Laboratoire de Génie des Procédés Biotechnologiques Agro-alimentaires, Thiverval Grignon, France.
Cryobiology
|October 1, 1990
Abstract:
Frozen suspensions of Streptococcus thermophilus were freeze-dried in a vacuum or a fluidized adsorbent bed at atmospheric pressure. Optimum operating conditions for each process were defined. For the duration of processing and survival rate of bacteria, in each case vacuum freeze-drying seemed more satisfactory than atmospheric pressure freeze-drying. The use of reconstituted skimmed milk as a suspension medium provides good protection for S. thermophilus.