118-28-5 Usage
Uses
Used in Research Applications:
5-amino-6-ethoxynaphthalene-2-sulphonic acid is used as a fluorescent probe for detecting proteins and amino acids, as well as for analyzing the binding of small molecules to proteins. Its fluorescent properties make it a valuable tool in biological and chemical research.
Used in Fluorescent Marker and Dye Preparation:
5-amino-6-ethoxynaphthalene-2-sulphonic acid is utilized in the preparation of fluorescent markers and dyes, which are essential for various applications in research and diagnostics.
Used in Textile Industry:
5-amino-6-ethoxynaphthalene-2-sulphonic acid is used as an acid dye in the textile industry, providing color to fabrics through its chemical properties.
Used in Paper Industry:
In the paper industry, 5-amino-6-ethoxynaphthalene-2-sulphonic acid serves as an acid dye, contributing to the coloration and appearance of paper products.
Used in Food Colorant Production:
5-amino-6-ethoxynaphthalene-2-sulphonic acid has applications in the production of food colorants, where it is used to impart specific colors to food products.
Safety Precautions:
It is important to handle 5-amino-6-ethoxynaphthalene-2-sulphonic acid with care, as it can be harmful if ingested or inhaled and may cause skin and eye irritation. Proper safety measures should be taken during its use and storage.
Check Digit Verification of cas no
The CAS Registry Mumber 118-28-5 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 1,1 and 8 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 118-28:
(5*1)+(4*1)+(3*8)+(2*2)+(1*8)=45
45 % 10 = 5
So 118-28-5 is a valid CAS Registry Number.
InChI:InChI=1/C12H13NO4S/c1-2-17-11-6-3-8-7-9(18(14,15)16)4-5-10(8)12(11)13/h3-7H,2,13H2,1H3,(H,14,15,16)
118-28-5Relevant academic research and scientific papers
Process for the preparation of 1-amino-2-ethoxy-naphthalene-6-sulphonic acid
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, (2008/06/13)
A process for the preparation of 1-amino-2-ethoxy-naphthalene-6-sulphonic acid from 2-hydroxy-naphthalene-6-sulphonic acid which comprises: A. contacting 2-hydroxy-naphthalene-6-sulphonic acid with at least an equimolar amount of an alkali metal nitrite in aqueous solution or suspension in the presence of hydrochloric acid, solution or suspension having a pH in the range of 2 to 5 and being at a temperature of 0° to 20° C.; B. reducing the reaction product of step A in an aqueous suspension by contacting the same with excess iron in the presence of at least an equivalent amount of iron-II ions, relative to the reaction product obtained according to step A, in the presence of a mineral acid at a temperature from 50° to 120° C., and treating the thus-obtained reaction mixture with aqueous alkali metal hydroxide in the presence of iron oxide; C. contacting the product of step B with excess acetic anhydride in an aqueous solution or suspension at a pH in the range of 3 to 10 at a temperature from 0° to 100° C.; D. contacting the product of step C with an ethylating agent in the presence of an acid binding agent in an aqueous-organic solvent or diluent in a pH range from 8 to 14 at a temperature from 20° to 150° C.; and E. deacetylating the product of step D by contacting the same at reflux with an aqueous alkali metal hydroxide.
