Amyloidity

This article describes a color reaction with tissue structures. The accumulation of abnormally changed proteins in the interstitial space is treated under amyloidosis .

The Amyloidität referred dyeability of tissue structures using iodine reagents. The associated adjective is called amyloid . If a structure cannot be colored, it is called inamyloid .

The color reaction of amyloid structures is an important taxonomic differentiation criterion , especially in mycology . The following reagents are used : Lugol's solution (an iodine-potassium iodide solution) and Melzer's reagent (= Lugol's solution with chloral hydrate ). The color reactions go from blue to purple. In the case of hemiamyloidity , the blue reaction is only obtained after KOH treatment; Without KOH, Lugol's solution causes a red to red-brown reaction, while the high chloral hydrate concentration in Melzer's reagent suppresses this red reaction, thus suggesting inamyloidy.

Structures that can be colored are in mushrooms: spores , spore ornaments, ascus walls (especially apical rings), hyphae , the trama of the fruiting bodies, etc.

literature

• Heinrich Dörfelt (Ed.): Lexicon of mycology . Gustav Fischer Verlag, Stuttgart, New York, 1989, ISBN 3-437-20413-0
• Hans-Otto Baral (1987): Lugol's solution / IKI versus Melzer's reagent: hemiamyloidity, a universal feature of the ascus wall. Mycotaxon 29: 399 450.