Freeze-drying of Streptococcus thermophilus: a comparison between the vacuum and the atmospheric method.
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.
Wolff
E
E
I.N.R.A. Laboratoire de Génie des Procédés Biotechnologiques Agro-alimentaires, Thiverval Grignon, France.
Delisle
B
B
Corrieu
G
G
Gibert
H
H
D001274:Atmospheric Pressure; D005069:Evaluation Studies as Topic; D005612:Freeze Drying / Q000379:methods*; D013291:Streptococcus; D014618:Vacuum