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How bacterial cells adhere to Congo red dye?

How bacterial cells adhere to Congo red dye?
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  1. Cetylpyridinium chloride ionize in water to form positively charged cetylpyridinium and negatively charged
    chloride ions. As bacterial cell wall is negatively charged, the positively charged ions of cetylpyridinium
    are adsorbed on the cell wall making it positively charged. Subsequent treatment with acidic dye like congo
    red will stain the cell wall by reacting with positively charged cell wall due to adsorption of cetylpyridinium.
    The reaction results in to visible red boundary formed around the bacterial cell due to selective deposition of
    staining reagents on the cell wall. The cytoplasm may later stained with basic dyes like methylene blue.

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