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100994

Sigma-Aldrich

Para Red

Dye content 95 %

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Synonym(s):
1-(4-Nitrophenylazo)-2-naphthol, 1-(p-Nitrophenylazo)-2-naphthol
Linear Formula:
O2NC6H4N=NC10H6OH
CAS Number:
Molecular Weight:
293.28
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.47

form

solid

Quality Level

composition

Dye content, 95%

mp

248-252 °C (lit.)

λmax

488 nm

SMILES string

Oc1ccc2ccccc2c1N=Nc3ccc(cc3)[N+]([O-])=O

InChI

1S/C16H11N3O3/c20-15-10-5-11-3-1-2-4-14(11)16(15)18-17-12-6-8-13(9-7-12)19(21)22/h1-10,20H

InChI key

WOTPFVNWMLFMFW-UHFFFAOYSA-N

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1 of 4

This Item
404365458848O0625
Para Red Dye content 95 %

Sigma-Aldrich

100994

Para Red

Procion® Red MX-5B Dye content 40 %

Sigma-Aldrich

404365

Procion® Red MX-5B

Allura Red AC Dye content 80 %

Sigma-Aldrich

458848

Allura Red AC

Oil Red O certified by the Biological Stain Commission

Sigma-Aldrich

O0625

Oil Red O

composition

Dye content, 95%

composition

Dye content, 40%

composition

Dye content, 80%

composition

Dye content, ≥75%

mp

248-252 °C (lit.)

mp

>300 °C (lit.)

mp

>300 °C (lit.)

mp

120 °C (dec.) (lit.)

λmax

488 nm

λmax

538 nm

λmax

504 nm

λmax

-

Quality Level

100

Quality Level

200

Quality Level

200

Quality Level

200

General description

Para Red is a biological stain. It is used as a fat soluble chemical dye and food additive. It is a banned colorant and a number of analytical techniques have been developed to detect it in food.

Biochem/physiol Actions

Para Red may be used to make standards for analysis.

Pictograms

Exclamation mark

Signal Word

Warning

Hazard Statements

Hazard Classifications

Eye Irrit. 2 - Skin Irrit. 2 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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25G
Pack Size/Quantity

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705578-5MG-PW

PL860-CGA/SHF-1EA

MMYOMAG-74K-13

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Z X Xu et al.
Journal of food science, 75(1), C49-C54 (2010-05-25)
In this article, we prepared a novel imprinted polymer by a room temperature ionic liquid-mediated surface molecular imprinting technique in combination with a sol-gel process. This polymer was characterized by static and kinetic adsorption experiments and exhibited good recognition ability
Constantinos K Zacharis et al.
Talanta, 84(2), 480-486 (2011-03-08)
This work reports a fast and simple liquid chromatographic method for the simultaneous determination of five banned fat-soluble synthetic colorants, namely Sudan I-IV and Para-Red, in spice samples. The analytes were successfully separated isocratically in less than 5 min on
Fabio Mazzotti et al.
Journal of agricultural and food chemistry, 56(1), 63-67 (2007-12-07)
A high-throughput mass spectrometric method is presented for the simultaneous detection of Sudan I, II, III, IV, and Para-Red azodyes in foodstuff. The method is based on the use of deuterium-labeled internal standards and atmospheric pressure chemical ionization (APCI) in

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