Periodic Acid Schiff Staining Method

**Semantic type:** Laboratory Procedure

**Definition:** This is an all-round useful stain for many things, including glycogen, mucin, mucoprotein, glycoprotein, as well as fungi. The reaction is based on the oxidation of glycol group to aldehydes by periodate. The schiff's reagent selectively stains the aldehydes to a rose pink color. PAS is useful for outlining tissue structures--basement membranes, capsules, blood vessels, etc.

**Synonyms:** - PAS - PAS Staining Method - PERIODIC ACID SCHIFF STAIN - Periodic Acid-Schiff Staining