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Related Experiment Videos

A novel staining method for detecting phytase activity.

H D Bae1, L J Yanke, K J Cheng

  • 1Research Centre, Agriculture and Agri-Food Canada, Lethbridge, Alberta.

Journal of Microbiological Methods
|December 1, 1999
PubMed
Summary
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A new two-step counterstaining method accurately detects microbial phytase activity in ruminal bacteria by preventing false positives from acid production. This technique enhances screening and zymogram assays for phytase-producing bacteria.

Area of Science:

  • Microbiology
  • Enzymology
  • Ruminant Nutrition

Background:

  • Differential agar media are commonly used to detect microbial phytase activity.
  • Existing methods struggle to distinguish phytase activity from acid production in ruminal bacteria.
  • Acidic conditions can lead to false positive results, complicating enzyme assays.

Purpose of the Study:

  • To develop a reliable method for detecting microbial phytase activity in ruminal bacteria.
  • To overcome limitations of existing differential media that produce false positives.
  • To improve the accuracy of screening and zymogram assays for phytase-producing bacteria.

Main Methods:

  • A two-step counterstaining treatment using cobalt chloride and ammonium molybdate/ammonium vanadate was developed.

Related Experiment Videos

  • This method reprecipitates acid-solubilized phytate, eliminating false positive results.
  • The treatment was applied to differential agar media for screening ruminal bacteria and in phytase zymogram assays.

    • Main Results:

    • The two-step counterstaining treatment effectively eliminated false positive results caused by acid production.
    • Accurate differentiation between microbial phytase activity and acid production was achieved.
    • The method demonstrated efficacy in both screening assays and phytase zymogram analyses.

    Conclusions:

    • The developed two-step counterstaining treatment provides a robust solution for accurately detecting microbial phytase activity in ruminal bacteria.
    • This method enhances the reliability of screening and zymogram assays, crucial for studying phytase-producing microorganisms.
    • The findings have significant implications for understanding microbial contributions to phytate degradation in ruminants.