Microbiological Assay of Vitamin B12 in the Presence of Tetracycline

AUTOR(ES)

Poonawalla, F. M.

RESUMO

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.

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