1.04211
Carminic acid (C.I. 75470)
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About This Item
Empirical Formula (Hill Notation):
C22H20O13
CAS Number:
Molecular Weight:
492.39
NACRES:
NA.21
UNSPSC Code:
12352106
MDL number:
assay
≥92%
Quality Level
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
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
11 - Combustible Solids
wgk
WGK 2
Regulatory Information
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Certificates of Analysis (COA)
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