Medical Definition of PAS stain
1.
A histochemical technique based on periodic acid oxidation of a substance containing the 1,2-glycol grouping.
It is used for staining carbohydrates as the resulting dialdehyde reacts with Schiff reagent to form a coloured product.
Substances that can be demonstrated include carbohydrates, mucins, cartilage matrix, collagen, reticulum, basement membranes, fibrin, thyroid colloid, amyloid, glomerular hyaline deposits, and a number of other secretions or tissue constituents.
Also used in for staining gels on which glycoproteins have been run.
See: periodic acid Schiff reaction
Synonym: PAS stain.
(22 Sep 2002)
Lexicographical Neighbors of PAS Stain
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