Carminic acid
SIAL/229253 - ≥90% (HPLC)
Synonym: Natural Red 4
CAS Number: 1260-17-9
Empirical Formula (Hill Notation): C22H20O13
Molecular Weight: 492.39
EC Number: 215-023-3
MDL Number: MFCD00167028
Linear Formula: C22H20O13
Product Type: Chemical
This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: 229253-1G
This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: 229253-1G
This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: 229253-5G
This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: 229253-5G
| ε (extinction coefficient) | ≥13000 at 222-228 nm in ethanol at 0.03 g/L |
| ≥18000 at 275-281 nm in ethanol at 0.03 g/L | |
| λmax | 495 nm |
| application(s) | diagnostic assay manufacturing hematology histology |
| assay | ≥90% (HPLC) |
| color | purple to red-purple |
| red to very dark red | |
| form | powder |
| InChI | 1S/C22H20O13/c1-4-8-5(2-6 |
| InChI key | DGQLVPJVXFOQEV-JNVSTXMASA |
| mp | 136 °C |
| optical activity | [α]20/D +3.1°, c = 1 in H2O |
| Quality Level | 100  |
| SMILES string | Cc1c(C(O)=O)c(O)cc2C(=O)c |
| solubility | 1 N acetic acid: 1%, clear to hazy, red |
| storage temp. | room temp |
| Application: | Carminic acid (CI 75470) is used in Orth’s lithium carmine technique for nuclear staining, Best’s stain for glycogen, and Southgates’s mucicarmine method. |
| General description: | Carmine is a cochineal product usually furnished as an aluminum and calcium salt of carminic acid. Carminic acid is used for human-medical cell diagnosis and serves the purpose of the histological investigation of sample material of human origin. It is suitable for staining nuclei in histological sections. It is utilized in various staining methods including the procedure for detection of glycogen and mucous substances (Best’s carmine), for nuclear staining, or vital staining. |
| Packaging: | 1, 5 g in glass bottle |
| RIDADR | NONH for all modes of transport |
| WGK Germany | WGK 2 |
| Purity | ≥90% (HPLC) |
| mp | 136 °C |
| Storage Temp. | room temp |
| Colour Index Number | 75470 |
| UNSPSC | 12171500 |