Flagella Stain

Flagella Stain

Principle of Flagella Stain

Flagella Staining is predicated on the principle of intensifying the visibility of bacterial flagella through thickening and coloring. This method enables the observation of their presence, quantity, and location, all of which are indispensable factors in the differentiation of various bacterial species. Although electron microscopes can also be employed for flagella observation, the staining technique is more accessible and widely adopted in laboratory settings.

Main Components

 The Flagella Staining procedure involves several reagents:

  1. Carbolfuchsin (solution A): This solution encompasses Carbolfuchsin, a pivotal component in the staining process.
  2. Tannic acid (solution B): Tannic acid constitutes another vital ingredient utilized in the staining solution.
  3. Potassium alum (solution C): Potassium alum serves as the third essential component indispensable for effective Flagella Staining.
  4. Filtration bottle: Utilized for the blending of these solutions.

Test Procedure

To execute Flagella Staining, adhere to these sequential steps:

  1. Working Reagent Preparation: Formulate a working reagent by amalgamating solutions A, B, and C in equal proportions (1:1:1 ratio). Allow the amalgam to stand for 2 hours prior to usage.
  2. Application of working reagent onto a slide: Administer a small quantity of the working reagent onto a glass slide and permit it to stain the specimen for roughly 10 to 15 minutes.
  3. Rinsing with distilled water: Slightly incline the slide and meticulously rinse it with distilled water, drop by drop.
  4. Drying and microscopic examination: Orient the slide vertically to facilitate drying. Once dried, scrutinize the smear under a microscope.

Result Interpretation

Upon examination, both the bacterial thallus (body) and flagella will manifest as vibrant red structures, rendering them amenable to analysis.

Method Limitation

 Flagella Staining is predominantly employed for morphological staining and visual inspection, constraining its utility to the physical attributes of bacteria.


 When undertaking Flagella Staining, it is imperative to observe the following precautions:

  1. Ensuring clean slides: Verify that the slides are impeccably clean to attain precise staining outcomes.
  2. Moderate water flushing: Exercise caution in the post-use water flushing process to avert the inadvertent loss of flagella and bacterial bodies.
  3. Professional handling: This staining kit should be administered solely by trained professionals, with result interpretation conducted exclusively by experts.
  4. Comprehensive instruction review: Thoroughly peruse the instruction manual prior to commencing the procedure, adhering to the stipulated expiration date, and maintaining proper personal hygiene.
  5. Waste management: Dispose of waste materials in accordance with the guidelines set forth by the hospital or environmental protection department. Promptly seal the reagent bottle after use to prevent evaporation.
  6. Verification of package information: Ensure the accuracy of the production lot number and expiration date specified on the package.


  • People’s Republic of China National Health and Family Planning Commission of Medical Affairs Authority. The Clinical Laboratory Operating Procedures M. Fourth edition. Beijing: People’s Medical Publishing House, 2014.
  • Tongming Qing: Clinical Laboratory Pathogenic Microbiology (M). Higher Education Press.
  • Ni Yu-xing: Microbiology and Microbiological Testing Experimental Guidance (M). People’s Health Publishing House.


In conclusion, Flagella Staining stands as an invaluable technique aiding microbiologists in bacterial differentiation based on flagella presence and characteristics. By adhering to the correct procedures and precautions, professionals can harness the potential of this staining method for precise bacterial analysis.

Flagella Stain

Flagella Staining is predicated on the principle of intensifying the visibility of bacterial flagella through thickening and coloring.

Product Brand: BASCO

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