What is the purpose of diastase digestion in the PAS procedure?

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Multiple Choice

What is the purpose of diastase digestion in the PAS procedure?

Explanation:
The test is probing how diastase changes PAS staining by removing glycogen. Diastase is an enzyme that digests glycogen in tissue sections. When you perform PAS after diastase digestion (PASD), the glycogen‑related PAS color disappears, so any remaining magenta positivity must come from diastase‑resistant carbohydrates such as mucopolysaccharides, mucins, or fungal cell walls. This distinction lets you confirm that a PAS positive result is due to glycogen or to other carbohydrate components, which is why the correct purpose is to digest glycogen.

The test is probing how diastase changes PAS staining by removing glycogen. Diastase is an enzyme that digests glycogen in tissue sections. When you perform PAS after diastase digestion (PASD), the glycogen‑related PAS color disappears, so any remaining magenta positivity must come from diastase‑resistant carbohydrates such as mucopolysaccharides, mucins, or fungal cell walls. This distinction lets you confirm that a PAS positive result is due to glycogen or to other carbohydrate components, which is why the correct purpose is to digest glycogen.

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