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1.04211

Sigma-Aldrich

Carminic acid (C.I. 75470)

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Empirical Formula (Hill Notation):
C22H20O13
CAS Number:
1260-17-9
Molecular Weight:
492.39
MDL number:
MFCD00167028
UNSPSC Code:
12352106
NACRES:
NA.21

Assay

≥92%

Quality Level

200

form

solid

pH

1.6 (20 °C, 10 g/L in H2O)

mp

136 °C (decomposition)

solubility

30 g/L

bulk density

490 kg/m3

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

2-30°C

InChI

1S/C22H20O13/c1-4-8-5(2-6(24)9(4)22(33)34)13(25)10-11(15(8)27)16(28)12(18(30)17(10)29)21-20(32)19(31)14(26)7(3-23)35-21/h2,7,14,19-21,23-24,26,28-32H,3H2,1H3,(H,33,34)/t7-,14-,19+,20-,21-/m1/s1

InChI key

DGQLVPJVXFOQEV-NGOCYOHBSA-N

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General description

The dye Carminic acid (C.I. 75470) GR for analysis and for microscopy, is a dry dye used to prepare dye-solutions. Together with a mordant solution of lithium, aluminium or boron it is used as a lake for staining. Carminic acid is applied for various stainings, e.g. for the detection of glycogen and mucous substances (Best′s carmine), for nucelar staining or for vital staining. The dye has a constant dye content and a reliable high quality, which is one of the major precondition for a reproducible diagnostic staining.

Application

GR for analysis and for microscopy

Analysis Note

Assay (spectrophotometrically; calculated on dried substance)≥ 92 %Identity (UV/VIS-Spectrum)passes testAbsorption maximum λ max (Hydrochloric acid 0.06 mol/l)492 - 495 nmSpec. Absorptivity A 1%/1cm (λmax; 0.014 g/l; Hydrochloric acid 0.06 mol/l; calc. on dried substance)160 - 187Loss on drying (110 °C)≤ 10 %Suitability for microscopypasses test

Storage Class Code

11 - Combustible Solids

WGK

WGK 2

Regulatory Information

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