Which fixative is used for PPB staining?

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Multiple Choice

Which fixative is used for PPB staining?

Explanation:
PPB staining (Picro-Picric-Blue) relies on the tissue remaining well-preserved without introducing extra picric acid or acidic conditions that could interfere with how the stain reacts. A neutral buffered fixative like 10% formalin keeps the pH around neutral and cross-links proteins to preserve structure without adding components that compete with or alter the stain. Bouin’s fixative contains picric acid and is acidic, which can leave picric residues that exaggerate background or shift colors, making the PPB stain unreliable. Alcohol fixes dehydrate and can cause tissue distortion and extraction of some components, also not ideal for PPB. So, the fixative that best supports accurate PPB staining is 10% neutral buffered formalin.

PPB staining (Picro-Picric-Blue) relies on the tissue remaining well-preserved without introducing extra picric acid or acidic conditions that could interfere with how the stain reacts. A neutral buffered fixative like 10% formalin keeps the pH around neutral and cross-links proteins to preserve structure without adding components that compete with or alter the stain. Bouin’s fixative contains picric acid and is acidic, which can leave picric residues that exaggerate background or shift colors, making the PPB stain unreliable. Alcohol fixes dehydrate and can cause tissue distortion and extraction of some components, also not ideal for PPB. So, the fixative that best supports accurate PPB staining is 10% neutral buffered formalin.

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