journal of Histology & Histopathology

Journal of Histology & Histopathology

ISSN 2055-091X
Original

Destructive properties of formalin on human otoconia

Rüdiger Kniep1†, Jana Buder1†, Alexander Blödow2 and Leif Erik Walther3*

*Correspondence: Erik Walther Leif Erik Walther@hno-praxis.sulzbach.de

3. University Medicine Mannheim, Theodor-Kutzer-Ufer 1-3, D-68167 Mannheim, Ruprecht-Karls-University Heidelberg, Germany.

Author Affiliations

†These authors contributed equally to this work.

1. Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, D-01187 Dresden, Germany.

2. Department of Otorhinolaryngology, Helios Clinic Berlin-Buch, Schwanebecker Chaussee 50, D-13125 Berlin, Germany.

Abstract

Background: Formalin is a preservation media for human tissues. Since the chemical structure is known, interaction in tissue preparation can be expected, that affect otoconia morphology. To investigate the suitability of the preservation media using formalin and ethanol for human otoconia in order to prove a shortterm and long-term storage after sampling.

Methods: Intact and degenerate human otoconia samples were exposed to formalin and pure ethanol. Morphological changes were observed by use of environmental scanning electron microscopy (ESEM).

Results: By means of detailed environmental electron microscopy (ESEM) investigations it was shown that formalin is not a suitable storage medium for human otoconia. The solvent of the formalin solution (H2O) attacks the calcite component of human otoconia immediately after exposure. At the same time the organic components of otoconia (proteins) are stabilized by interaction with formaldehyde and their original structure remains unaffected. After ethanol exposure, the morphology of otoconia remains unchanged.

Conclusions: Formalin is not suitable for preservation of tissue material containing otoconia if further ultrastructural and morphological investigations should be performed. A suitable medium for preserving otoconia is pure ethanol, which keeps the composite structure without morphological changes over a long period of time.

Keywords: Otoconia, benign paroxysmal positional vertigo, BPPV, otolith organs, saccule, utricle, formalin, ethanol

ISSN 2055-091X
Volume 2
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