Acide osmique Sealed ampule, Sigma-Aldrich®
Fournisseur: SIGMA ALDRICH MICROSCOPY
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Danger
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Synonyms:
Osmium (VIII) oxide, Osmic acid anhydride, Osmic acid
M-Clarity™ (Niveau de Qualité) = MQ200
Osmium tetroxide (OsO₄) is a heavy tetrahedral, symmetrical molecule composed of osmium, a third-row transition metal. Osmium tetroxide 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 testroxide to ensure preservation of the lipids.
Osmium tetroxide chemically combines with lipids making them insoluble; only 7% of the lipids can be extracted after the fixation. Therefore, the cell membranes comprising phospholipids become black and electron-dense after fixation in osmium tetroxide. It is also used to fix small amount of fat maintained in sections during paraffin processing.
Attention: Due to the hazardous nature of osmium tetroxide, it is recommended to use an ampule opener when using this chemical.
Formule:
O₄Os MW: 254.23 g/mol Point d'ébullition: 130 °C (lit.) Point de fusion: 39,5...41 °C (lit.) Température de stockage: Température ambiante |
Numéro MDL:
MFCD00011150 Numéro CAS: 20816-12-0 EINECS: 244-058-7 ONU: 2471 ADR: 6.1 I Merck Index: 13,06962 |
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Résultats des tests de spécification
Appearance (Colour) | Yellow to Yellow-Green |
Appearance (Form) | Powder or Crystals |
Osmium (Os) | Report Result |
Expiration Date Period | 5 Years |
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