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229253

Sigma-Aldrich

Carminic acid

≥90% (HPLC)

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Synonym(s):
Natural Red 4
Empirical Formula (Hill Notation):
C22H20O13
CAS Number:
Molecular Weight:
492.39
Colour Index Number:
75470
Beilstein:
71651
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.47

Quality Level

Assay

≥90% (HPLC)

form

powder

optical activity

[α]20/D +3.1°, c = 1 in H2O

mp

136 °C

λmax

495 nm

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

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

Cc1c(C(O)=O)c(O)cc2C(=O)c3c(O)c(O)c([C@@H]4O[C@H](CO)[C@@H](O)[C@H](O)[C@H]4O)c(O)c3C(=O)c12

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-JNVSTXMASA-N

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1 of 4

This Item
C1022C615211298
Carminic acid ≥90% (HPLC)

Sigma-Aldrich

229253

Carminic acid

Carmine powder

Sigma-Aldrich

C1022

Carmine

Carmine certified by the Biological Stain Commission

Sigma-Aldrich

C6152

Carmine

Carminic acid analytical standard

Supelco

11298

Carminic acid

form

powder

form

powder

form

powder

form

-

mp

136 °C

mp

-

mp

-

mp

-

λmax

495 nm

λmax

-

λmax

-

λmax

-

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

ε (extinction coefficient)

-

ε (extinction coefficient)

-

ε (extinction coefficient)

-

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

cleaning products
cosmetics
food and beverages
personal care

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.

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.

Storage Class Code

11 - Combustible Solids

WGK

WGK 2

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Essential parameters related to the photoelectrochemical properties, such as ground state geometries, electronic structures, oxidation potential and electron driving force, of cochineal insect dyes were investigated by DFT and TDDFT at the B3LYP/6-31+G(d,p) level of the theory. The results show

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