When a PAS-stained liver control shows very weak staining, which reagent should be checked to troubleshoot?

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Multiple Choice

When a PAS-stained liver control shows very weak staining, which reagent should be checked to troubleshoot?

Explanation:
PAS staining relies on the aldehydes generated by periodic acid oxidizing carbohydrates to react with Schiff reagent to produce the magenta color. If a liver control shows very weak staining, the most likely issue is with the Schiff reagent, which is responsible for developing the color. A Schiff reagent that is old, degraded, or improperly prepared will yield faint staining even if the rest of the protocol is fine. Therefore, check the Schiff reagent with formaldehyde for freshness, correct preparation, and proper storage. Hematoxylin and eosin are used for counterstaining and general tissue contrast and do not drive the PAS color development, while DAB is used in immunohistochemistry, not PAS.

PAS staining relies on the aldehydes generated by periodic acid oxidizing carbohydrates to react with Schiff reagent to produce the magenta color. If a liver control shows very weak staining, the most likely issue is with the Schiff reagent, which is responsible for developing the color. A Schiff reagent that is old, degraded, or improperly prepared will yield faint staining even if the rest of the protocol is fine. Therefore, check the Schiff reagent with formaldehyde for freshness, correct preparation, and proper storage. Hematoxylin and eosin are used for counterstaining and general tissue contrast and do not drive the PAS color development, while DAB is used in immunohistochemistry, not PAS.

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