What does the Alcian blue mucosubstance stain demonstrate, and which controls are appropriate?

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Multiple Choice

What does the Alcian blue mucosubstance stain demonstrate, and which controls are appropriate?

Alcian blue mucosubstance staining is used to detect mucins that carry acidic groups. At pH 2.5, Alcian blue binds to acid mucins (including sulfated and carboxylated mucins), so these mucins appear blue. When the stain is done at pH 1.0, sulfated mucins are stained even more specifically, allowing differentiation from non-sulfated acidic mucins. Neutral mucins do not bind Alcian blue and remain unstained. For controls, tissues rich in acidic/sulfated mucins, such as the colon, small intestine, or appendix, provide reliable positive controls to confirm the staining pattern.

Alcian blue mucosubstance staining is used to detect mucins that carry acidic groups. At pH 2.5, Alcian blue binds to acid mucins (including sulfated and carboxylated mucins), so these mucins appear blue. When the stain is done at pH 1.0, sulfated mucins are stained even more specifically, allowing differentiation from non-sulfated acidic mucins. Neutral mucins do not bind Alcian blue and remain unstained. For controls, tissues rich in acidic/sulfated mucins, such as the colon, small intestine, or appendix, provide reliable positive controls to confirm the staining pattern.

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