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Related Experiment Videos

Neomycin: microbiological assay or liquid chromatography?

E Adams1, L Liu, K Dierick

  • 1Katholieke Universiteit Leuven, Faculteit Farmaceutische Wetenschappen, Laboratorium voor Farmaceutische Chemie en Analyse van Geneesmiddelen, Belgium.

Journal of Pharmaceutical and Biomedical Analysis
|July 31, 1998
PubMed
Summary

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The microbiological assay for neomycin shows poor reproducibility due to neomycin C. Liquid chromatography is proposed to replace this method for more accurate neomycin analysis.

Area of Science:

  • Pharmaceutical Science
  • Analytical Chemistry
  • Microbiology

Background:

  • Microbiological assays are standard for determining neomycin potency.
  • Neomycin C, a component of neomycin, can affect assay reproducibility.
  • Existing methods may lack precision due to neomycin C variability.

Purpose of the Study:

  • To evaluate the impact of neomycin C on the reproducibility of microbiological assays for neomycin.
  • To compare the relative activity of neomycin C and neomycin B.
  • To assess the suitability of liquid chromatography for neomycin analysis.

Main Methods:

  • Multicentre microbiological assay of neomycin samples with varying neomycin C content.
  • Determination of neomycin potency using European Pharmacopoeia method with neomycin B standard.

Related Experiment Videos

  • Liquid chromatography analysis to verify neomycin C content in official standards.

    • Main Results:

    • Relative standard deviations (RSD) between laboratories ranged from 4.8% to 50%, increasing with neomycin C content.
    • Neomycin C showed lower relative activity (56-62%) compared to neomycin B.
    • Neomycin C content in official standards varied significantly (0.4-5.8%).

    Conclusions:

    • The presence of neomycin C significantly impacts the reproducibility of neomycin microbiological assays.
    • Liquid chromatography offers a more reliable method for quantifying neomycin and its components.
    • Introduction of liquid chromatography into official monographs is recommended to improve neomycin assay accuracy.