N-Ethyl-N-(3-sulfopropyl)-m-anisidine Sodium Salt

This material is commonly obtained as a white to pale beige crystalline solid. Its molecular formula is C12H18NNaO4S, corresponding to a molecular weight of 295.33. The melting point generally exceeds 280 ℃, often with decomposition before reaching a defined melt. The calculated density is approximately 1.3 g/cm³ under ambient conditions. It is freely soluble in water due to the sulfonate sodium salt, moderately soluble in methanol and ethanol, and practically insoluble in non-polar organic solvents such as acetone, dichloromethane, and toluene. The molecule is stable under normal storage conditions but should be protected from prolonged exposure to light and moisture. The sulfonate group renders the compound anionic, and it may form ion pairs with cationic species. Storage in a tightly sealed container at ambient temperature is adequate, though desiccated conditions are preferred for long-term preservation. Contact with strong oxidizing agents and concentrated mineral acids should be avoided to prevent decomposition.

N-Ethyl-N-(3-sulfopropyl)-m-anisidine sodium salt is a zwitterionic sulfonate derivative of m-anisidine. Its structure features a meta-methoxyphenyl ring carrying an ethyl group and a 3-sulfopropyl chain on the nitrogen atom, with the sulfonic acid present as its sodium salt. This arrangement creates a molecule that combines a hydrophobic aromatic portion with a hydrophilic, permanently charged sulfonate group. The compound is a typical example of a "Good's buffer" type zwitterion and is widely recognized as a component of Trinder's reagent systems. Its ability to undergo oxidative coupling with 4-aminoantipyrine in the presence of hydrogen peroxide and peroxidase to form a stable quinoneimine dye makes it an indispensable tool in clinical chemistry. The methoxy substituent influences the chromogenic properties of the final dye, shifting its absorption maximum and improving sensitivity in enzymatic assays.

This compound is extensively employed as a chromogenic coupling agent in enzymatic colorimetric assays for the determination of glucose, cholesterol, uric acid, and triglycerides in biological fluids. In the presence of peroxidase, it reacts with hydrogen peroxide generated by specific oxidases and 4-aminoantipyrine to produce a quinoneimine dye whose absorbance is measured spectrophotometrically. Its high molar absorptivity and water solubility make it ideal for automated clinical analyzers.

In research laboratories, it serves as a sensitive probe for detecting hydrogen peroxide produced by enzymatic reactions, including those catalyzed by glucose oxidase, lactate oxidase, and choline oxidase. It is also used in ELISA (enzyme-linked immunosorbent assay) systems where peroxidase is the label enzyme, providing a colorimetric readout for antigen or antibody quantification.

The compound is utilized in the development of HPLC post-column derivatization methods for detecting compounds that can be enzymatically converted to hydrogen peroxide. It enables the sensitive and specific detection of pharmaceuticals and metabolites in complex matrices, facilitating pharmacokinetic and bioequivalence studies.

Beyond clinical and research settings, this reagent finds application in the food and beverage industry for the enzymatic determination of glucose and other analytes. It is also employed in environmental monitoring to measure hydrogen peroxide levels in water samples, aiding in the assessment of oxidative stress and pollution.

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