What is the purpose of diastase digestion in PAS staining?

Prepare for the Histotechnologist Certification Exam with our comprehensive study material. Use flashcards, detailed explanations, and intuitive multiple-choice questions. Boost your test readiness and achieve certification success!

Multiple Choice

What is the purpose of diastase digestion in PAS staining?

Explanation:
Diastase digestion in PAS staining is used to determine if PAS positivity is due to glycogen. The enzyme diastase (alpha-amylase) breaks down glycogen into smaller sugars, so when tissue is treated with diastase before the PAS reaction, glycogen is removed and the tissue loses its magenta stain in those areas. If PAS color disappears after diastase, the original staining was from glycogen. If staining remains, the positive carbohydrate is not glycogen (for example, mucins or basement membrane components). This helps differentiate glycogen from other PAS-positive substances. It’s not used to digest proteins, remove dye, or stain lipids.

Diastase digestion in PAS staining is used to determine if PAS positivity is due to glycogen. The enzyme diastase (alpha-amylase) breaks down glycogen into smaller sugars, so when tissue is treated with diastase before the PAS reaction, glycogen is removed and the tissue loses its magenta stain in those areas. If PAS color disappears after diastase, the original staining was from glycogen. If staining remains, the positive carbohydrate is not glycogen (for example, mucins or basement membrane components). This helps differentiate glycogen from other PAS-positive substances. It’s not used to digest proteins, remove dye, or stain lipids.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy