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Appl Environ Microbiol. 1965 September; 13(5): 755-756
Copyright © 1965 American Society for Microbiology. All Rights Reserved.

Microbiological Assay of Vitamin B12 in the Presence of Tetracycline

F. M. Poonawalla and M. R. S. Iyengar

Microbiological Research Laboratory, Alembic Chemical Works, Baroda, India

ABSTRACT

Treatment of a pharmaceutical preparation of vitamin B12 and tetracycline with an ion-exchange resin by the batch method differentially adsorbed tetracycline, making possible a statistically reproducible microbiological assay of vitamin B12 by the standard Escherichia coli plate method.

Appl Environ Microbiol. 1965 September; 13(5): 755-756
Copyright © 1965 American Society for Microbiology. All Rights Reserved.





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Copyright © 1965 by the American Society for Microbiology. All rights reserved.