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Microbiological determination of neomycin in feeds: collaborative study.

G L Stahl1, D D Kratzer, C W Kasson

  • 1Upjohn Co., Kalamazoo, MI 49001.

Journal - Association of Official Analytical Chemists
|March 1, 1989
PubMed
Summary

This study modified the microbiological determination of neomycin in animal feeds. The revised method showed promising results, though further validation is needed for accurate neomycin quantification.

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Area of Science:

  • Microbiology
  • Analytical Chemistry
  • Animal Nutrition

Background:

  • Accurate quantification of neomycin in animal feed is crucial for regulatory compliance and animal health.
  • The existing AOAC microbiological determination method requires optimization for improved reliability and efficiency.

Purpose of the Study:

  • To collaboratively study a modified AOAC microbiological method for neomycin determination in animal feeds.
  • To assess the accuracy and precision of the modified method compared to the official AOAC procedure.

Main Methods:

  • Modification of the AOAC method by using a constant salt concentration diluent and tris buffer for agar medium.
  • Implementation of a monolayer plating system for neomycin determination.
  • Collaborative study involving 12 laboratories analyzing 8 feed samples with varying neomycin concentrations.

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Main Results:

  • Mean recovery of neomycin across laboratories was 110.7% of theoretical values.
  • A wide range of mean recoveries (69.4-128.6%) was observed among laboratories, with some outliers excluded.
  • Statistical analysis yielded a confidence interval of +/- 26% for individual assays.

Conclusions:

  • The modified microbiological method for neomycin determination in feeds shows potential for improved accuracy.
  • Further refinement and validation are recommended to reduce variability and enhance the precision of the method for routine analysis.