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Merck
CN

89774

Citrus Red 2

analytical standard

Synonym(s):

1-(2,5-Dimethoxyphenylazo)-2-naphthol

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About This Item

Empirical Formula (Hill Notation):
C18H16N2O3
CAS Number:
6358-53-8
Molecular Weight:
308.33
UNSPSC Code:
85151701
NACRES:
NA.24
E Number:
E121
PubChem Substance ID:
329769536
EC Number:
228-778-9
MDL number:
MFCD01712266
Colour Index Number:
12156
Beilstein/REAXYS Number:
4510811

Key Documents

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Product Name

Citrus Red 2, analytical standard

InChI key

GJUABKCEXOMRPQ-UHFFFAOYSA-N

InChI

1S/C18H16N2O3/c1-22-13-8-10-17(23-2)15(11-13)19-20-18-14-6-4-3-5-12(14)7-9-16(18)21/h3-11,21H,1-2H3

SMILES string

COc1ccc(OC)c(c1)N=Nc2c(O)ccc3ccccc23

grade

analytical standard

assay

≥98.5% (HPLC)

shelf life

limited shelf life, expiry date on the label

technique(s)

HPLC: suitable
gas chromatography (GC): suitable

application(s)

cleaning products
cosmetics
food and beverages
personal care

format

neat

Quality Level

100

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Application

Refer to the product′s Certificate of Analysis for more information on a suitable instrument technique. Contact Technical Service for further support.

General description

Citrus red 2 is an artificial dye, which belongs to the mono-azo group of dyes. It may be used to color orange skins.

Other Notes

Find a digital Reference Material for this product available on our online platform ChemisTwin® for NMR. You can use this digital equivalent on ChemisTwin® for your sample identity confirmation and compound quantification (with digital external standard). An NMR spectrum of this substance can be viewed and an online comparison against your sample can be performed with a few mouseclicks. Learn more here and start your free trial.

Packaging

Bottomless glass bottle. Contents are inside inserted fused cone.

pictograms

Health hazard
GHS08

signalword

Warning

hcodes

H351

pcodes

P281

Hazard Classifications

Carc. 2

Storage Class

11 - Combustible Solids

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
BCCK7300
BCBB6563

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Food Additive Toxicology (1994)
Li Hu et al.
Se pu = Chinese journal of chromatography, 30(8), 832-835 (2012-12-22)
An ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/ MS) method was developed for the determination of citrus red 2 (CR2) in navel orange. The sample was extracted with acetonitrile, cleaned-up by an NH2 solid phase extraction cartridge. Then, the analyte

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