1.04211

Carminic acid (C.I. 75470)

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

Properties

• 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

Description

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 (λ_max; 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

Safety Information

• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 2