100994

Sigma-Aldrich

Para Red

Dye content 95 %

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

composition

Dye content, 95%

Quality Level

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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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.

Packaging

25 g in glass bottle

Biochem/physiol Actions

Para Red may be used to make standards for analysis.

Pictograms

Exclamation mark

Signal Word

Warning

Hazard Statements

Target Organs

Respiratory system

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

RIDADR

NONH for all modes of transport

WGK Germany

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis
Certificate of Origin
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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