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75633

Sigma-Aldrich

Osmium tetroxide solution

suitable for electron microscopy, 2% in H2O

Synonyme(s) :

Osmium(IV) oxide

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About This Item

Formule linéaire :
OsO4
Numéro CAS:
20816-12-0
Poids moléculaire :
254.23
Numéro MDL:
MFCD00011150
Code UNSPSC :
12171500
ID de substance PubChem :
57652577
Nomenclature NACRES :
NA.47

Forme

solution

Pertinence de la réaction

reagent type: oxidant

Concentration

2% in H2O

Technique(s)

electron microscopy: suitable

Couleur

colorless to yellow

Densité

1.0 g/mL at 20 °C
1.0 g/mL at 20 °C

Application(s)

hematology
histology

Température de stockage

2-8°C

Chaîne SMILES 

O=[Os](=O)(=O)=O

InChI

1S/4O.Os

Clé InChI

VUVGYHUDAICLFK-UHFFFAOYSA-N

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Description générale

Osmium tetroxide (OsO4) also referred to as osmium, is a heavy tetrahedral, symmetrical molecule. It is both a dye and a non-coagulant fixative agent in electron microscopy primarily used for the examination of biological tissue components in the histopathology laboratory. Specimens are postfixed with osmium tetroxide to ensure the preservation of the lipids.

Application

Osmium tetroxide solution has been used as a fixative in electron microscopy.

Actions biochimiques/physiologiques

Osmium tetroxide is also referred to as osmium and is mainly used as a secondary fixative of tissues. The molecule reacts with lipid moieties and is responsible for the oxidation of unsaturated bonds of fatty acids. This reaction adds density and contrast to biological samples. In normal tissues, presence of osmium results in intense black staining which can be viewed by normal eye. In addition, it can be used as a mordant (a molecule which combines with stain or dye at later stages) in electron microscopy, thereby enhancing lead staining.

Pictogrammes

Skull and crossbonesCorrosion
GHS06,GHS05

Mention d'avertissement

Danger

Mentions de danger

H302 + H332,H310,H315,H318

Classification des risques

Acute Tox. 2 Dermal - Acute Tox. 4 Inhalation - Acute Tox. 4 Oral - Eye Dam. 1 - Skin Irrit. 2

Code de la classe de stockage

6.1B - Non-combustible acute toxic Cat. 1 and 2 / very toxic hazardous materials

Classe de danger pour l'eau (WGK)

WGK 1

Point d'éclair (°F)

Not applicable

Point d'éclair (°C)

Not applicable

Équipement de protection individuelle

Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter

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de Barros CM, et al.
Nitric Oxide, 38, 26-26 (2014)
Electron Microscopy: Principles and Techniques for Biologists (1999)
Bianca N S P Medina et al.
Developmental neurobiology, 75(8), 877-893 (2014-12-09)
Ascidians are interesting neurobiological models because of their evolutionary position as a sister-group of vertebrates and the high regenerative capacity of their central nervous system (CNS). We investigated the degeneration and regeneration of the cerebral ganglion complex of the ascidian
F Wyss et al.
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