PAS is used in histology to stain carbohydrate-rich macromolecules such as glycogen, glycoprotein and proteoglycans, commonly found in connective tissue, basal laminae, fungi and certain bacteria.

Application

Periodic acid–Schiff (PAS) is a staining method used to detect polysaccharides such as glycogen, and mucosubstances such as glycoproteins, glycolipids and mucins in tissues.