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. 1965 Sep;13(5):755–756. doi: 10.1128/am.13.5.755-756.1965

Microbiological Assay of Vitamin B₁₂ in the Presence of Tetracycline

F M Poonawalla ¹, M R S Iyengar ¹

PMCID: PMC1058337 PMID: 5325938

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.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

DAVIS B. D., MINGIOLI E. S. Mutants of Escherichia coli requiring methionine or vitamin B12. J Bacteriol. 1950 Jul;60(1):17–28. doi: 10.1128/jb.60.1.17-28.1950. [DOI] [PMC free article] [PubMed] [Google Scholar]
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