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Sigma-Aldrich

Safranine O (C.I. 50240)

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Empirical Formula (Hill Notation):
C20H19ClN4
CAS Number:
Molecular Weight:
350.84

form

solid

Quality Level

composition

Dye, ≥80% spectrophotometric assay

pH

10 (20 °C, 10 g/L in H2O)

solubility

50 g/L

bulk density

400 kg/m3

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

2-30°C

InChI

1S/C20H18N4.ClH/c1-12-10-17-19(11-16(12)22)24(14-6-4-3-5-7-14)18-9-8-15(21)13(2)20(18)23-17;/h3-11,22H,21H2,1-2H3;1H

InChI key

QRYAEWIQIBAZOJ-UHFFFAOYSA-N

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General description

Safranin O (C.I. 50240) for microscopy Certistain®, is a dry dye that is used for the preparation of a staining solution for e.g. Gram stain procedures in smears and sections of human origin in bacteriology. The Gram staining allows a fast differentiation of bacteria in Gram-positive and Gram-negative. The mureine structure of the bacteria walls is the basis of the color affinity. Gram-negative bacteria will be counterstained by Gram′s safranin O solution and appear orange. As a CERTISTAIN® dye it is chemically quality-certified according to highest standards and strict specifications.

Application

for microscopy Certistain®

Analysis Note

Dye content (spectrophotometrically): ≥ 80 %
Identity (UV/VIS-Spectrum): passes test
Absorption maximum λ max (ethanol 50 %): 530 - 534 nm
Spec. Absorptivity A 1%/1cm (λmax; 0.003 g/l; ethanol 50 %): 1260 - 1570
TLC-Test: passes test
Loss on drying (110 °C): ≤ 15 %
Suitability for microscopy: passes test

Legal Information

CERTISTAIN is a registered trademark of Merck KGaA, Darmstadt, Germany

pictograms

Corrosion

signalword

Danger

hcodes

Hazard Classifications

Eye Dam. 1

Storage Class

11 - Combustible Solids

wgk_germany

WGK 3


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