Name a substance that is often combined with the Alcian blue technique.

• A. Hyaluronidase
• B. Diastase
• C. Amylase
• D. Protease

Answer: (A)

Alcian blue targets acidic mucopolysaccharides (glycosaminoglycans) in tissue. Enzymatic pretreatment with hyaluronidase is often used before this stain because it digests hyaluronic acid and related glycosaminoglycans. By removing these components, you can see how much of the Alcian blue staining depends on hyaluronic acid and differentiate the contributions of various mucins. This helps confirm the presence and types of acidic mucins and improves the specificity of the stain. Other enzymes like diastase, amylase, or protease aren’t as commonly used with Alcian blue for this purpose, so hyaluronidase is the best-supported pairing.