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Formazan-Stabilität und -Reoxydation in Gewebsstrukturen unter dem Einfluß elektronenmikroskopischer Präparationstechnik

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Summary

The stability of NBT and TNBT towards embedding media used in electron microscopy (Methacrylat, Vestopal W, Araldit, Epon) and their ability to be re-oxidized was tested on formazan-containing tissue sections and trial stripes. The formazans of the monotetrazoles INT, MTT and TTC were included for comparative reasons. After having been exposed to osmium vapour or 2% OsO4-solution over a period of 4 weeks formazan-containing trial stripes showed no changes whatsoever; the formazans of TTC, MTT, and INT were quantitatively soluble in ether after OsO4 treatment, whereas the di-formazans of NBT and TNBT which are known to be stable to organic solvents, could not be extracted. The ether soluble formazans of TTC and MTT could be re-oxidized by OsO4. INT-, MTTCo-, and NBT-formazan containing kidney sections showed no sign of re-oxidation after 1 hour fixation in 1% OsO4-solution and storage for four years. It is therefore concluded that formazan which is bound to tissue lipoproteins is difficult to re-oxidize with OsO4 in concentrations normally used in electron microscopy. Benzoyl peroxyd, which acts as an catalyser when methacrylat is used as embedding material, re-oxidized all formazans of the tetrazoles under test within a very short period of time. The components Activateur and Initiateur of the Vestopal W embedding substance also induced a (delayed) formazan re-oxidation; the formazans of NBT and TNBT showed no reaction to the components of Araldit and Epon embedding material, MNA excluded.

The fixation of the tissues with various aldehydes (glutaraldehyde, hydroxyaldipaldehyde, crotonaldehyde, formaldehyde) followed by incubation in a TNBT-solution caused a temperature dependent reduction of the TNBT to brown di-formazan which may have some influence in the interpretation of enzyme-histochemical investigations.

Zusammenfassung

Es wurden NBT und TNBT hinsichtlich ihrer Stabilität gegenüber elektronenmikroskopischen Einbettungsmitteln (Methacrylat, Vestopal W, Araldit, Epon) sowie ihrer Reoxydationsfähigkeit (OsO4, Benzoylperoxyd) an formazanhaltigen Gewebsschnitten und Teststreifen untersucht. Vergleichsweise kamen auch die Formazane der Monotetrazole INT, MTT sowie TTC zur Testung. — Formazanhaltige Teststreifen lassen nach 4wöchiger Einwirkung von Osmium-Dämpfen oder 2% iger OsO4-Lösung keine Veränderungen erkennen; die Formazane vom TTC, MTT und INT lösen sich auch nach OsO4-Behandlung quantitativ in Äther, während die in organischen Lösungsmitteln beständigen Diformazane vom NBT und TNBT sich nicht extrahieren lassen. Die in Äther gelösten Formazane vom TTC und MTT werden in kurzer Zeit durch OsO4 reoxydiert. INT-, MTTCo- und NBT-formazanhaltige Nierenschnitte lassen nach Istündiger Fixierung in l% iger OsO4-Lösung nach 4jähriger Aufbewahrung keine Reoxydationserseheinungen erkennen. Es wird daraus der Schluß gezogen, daß an Lipoproteinstrukturen des Gewebes gebundenes Formazan einer Reoxydation durch OsO4 in den zur elektronenmikroskopischen Präparation verwendeten Konzentrationen schwer zugänglich ist. — Sämtliche Formazane der getesteten Tetrazole werden durch den bei der Methacrylat-Einbettung verwendeten Katalysator Benzoylperoxyd schon nach kurzer Einwirkungszeit vollständig zum Tetrazol reoxydiert. Durch die Komponenten Activateur und Initiateur der Vestopal-W-Einbettung erfolgt ebenfalls eine — wenn auch verzögerte — Formazan-Reoxydation, während die Formazane vom NBT und TNBT gegenüber den Komponenten der Araldit- und Epon-Einbettung (mit Ausnahme von MNA) keine Veränderungen erkennen lassen.

Eine Vorfixierung von Gewebsproben in verschiedenen Aldehyden (Glutaraldehyd, Hydroxyadipaldehyd, Crotonaldehyd, Formaldehyd) und anschließende Inkubation in einer TNBT-Lösung bewirkt eine temperaturabhängige Reduktion des TNBT zum braunen Diformazan und dürfte daher von Einfluß auf die Interpretation enzymhistochemischer Untersuchungen sein.

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Wohlrab, F., Fuchs, U. Formazan-Stabilität und -Reoxydation in Gewebsstrukturen unter dem Einfluß elektronenmikroskopischer Präparationstechnik. Histochemie 11, 171–179 (1967). https://doi.org/10.1007/BF00571723

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