587-98-4 Usage
Description
Metanil Yellow is a yellow monoazo dye, an organic sodium salt with the counterion 3-[(4-anilinophenyl)diazenyl]benzene-1-sulfonate. It is known for its use as a counterstain in PAS (periodic acid-Schiff) or iron-hematoxylin stained sections to increase contrast. At pH 1.2, Metanil Yellow appears red, while at pH 2.3, it turns yellow. It is also characterized by its properties such as light fastness, soaping, perspiration fastness, oxygen bleaching, and fastness to seawater, with varying ratings on the ISO and AATCC scales.
Uses
1. Used in Leather Industry:
Metanil Yellow is used as a dye in the leather industry, providing color and enhancing the appearance of leather products.
2. Used in Wood Stains:
Metanil Yellow is also utilized in wood stains, contributing to the color and aesthetic appeal of wooden items.
3. Used as a Food Dye (Historic use in India):
Although not commonly used today, Metanil Yellow was once employed as a food dye in India.
4. Used as an Indicator in Laboratories:
Metanil Yellow serves as an indicator in 0.1% solution, where 2 drops are required for 10 ml of liquid. It is particularly useful in determining the presence of trace amounts of nitrates and nitrites in a solution through spectrophotometric methods. The discoloring of Metanil Yellow, catalyzed by potassium bromate, can be analyzed by spectrophotometry.
5. Used in Staining Techniques:
Metanil Yellow is used in one variant of Masson's trichrome to stain collagen yellow, providing a contrast to the red muscle. However, it is not commonly used in this application.
6. Used in pH Indicator Applications:
Metanil Yellow is used as a pH indicator in laboratories, with its color changing from red at pH 1.2 to yellow at pH 2.3.
Chemical Properties:
Metanil Yellow is an orange powder with various fastness properties, including light fastness, soaping, perspiration fastness, oxygen bleaching, and fastness to seawater. It has received ratings of ISO 3, 2, and 2-3, as well as AATCC 3, 1, and 4-5, 1, indicating its performance in different conditions.
Flammability and Explosibility
Notclassified
Biochem/physiol Actions
Metanil yellow is an azo dye. It is used as a counterstain in PAS (periodic acid-Schiff)/iron-hematoxylin stained sections to increase contrast. Metanil yellow changes its color from red at pH 1.2 to yellow at pH 2.3.
Contact allergens
Metanil yellow is a yellow monoazoic dye. This color ing agent is used in leather and wood stains, and is also employed as a food dye in India.
Safety Profile
Moderately toxic by
intraperitoneal route. Experimental
reproductive effects. Human mutation data
reported. When heated to decomposition it
emits toxic fumes of SOx, NOx, and NazO.
See also AROMATIC AMINES and
SULFONATES.
Standard
Light Fastness
Fading
Stain
ISO
3
AATCC
3
Purification Methods
It can be salted out from water three times with sodium acetate, then repeatedly extracted with EtOH [McGrew & Schneider J Am Chem Soc 72 2547 1950]. [Beilstein 16 II 168.]
Check Digit Verification of cas no
The CAS Registry Mumber 587-98-4 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,8 and 7 respectively; the second part has 2 digits, 9 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 587-98:
(5*5)+(4*8)+(3*7)+(2*9)+(1*8)=104
104 % 10 = 4
So 587-98-4 is a valid CAS Registry Number.
InChI:InChI=1/C18H15N3O3S.Na/c22-23-24-25-18-8-4-7-17(13-18)21-20-16-11-9-15(10-12-16)19-14-5-2-1-3-6-14;/h1-13,19,22H;/q;+1/p-1/rC18H14N3NaO3S/c22-23-24-25-26-18-8-4-7-17(13-18)21-20-16-11-9-15(10-12-16)19-14-5-2-1-3-6-14/h1-13,19H
