In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Three-way analysis-based pH-UV-Vis spectroscopy for quantifying allura red in an energy drink and determining colorant’s pKa, published in 2021, which mentions a compound: 25956-17-6, Name is Sodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl)naphthalene-2-sulfonate, Molecular C18H14N2Na2O8S2, Formula: C18H14N2Na2O8S2.
Three-way anal.-based pH-UV-Vis spectroscopy was proposed for quantifying allura red in an energy drink product without the need for chromatog. anal., and determining the colorant’s pKa without using any titration technique. In this study, UV-Vis spectroscopic data matrixes were obtained from absorbance measurements at five different pH levels from pH 8 to pH 12 and arranged as a three-way array (wavelength x sample x pH). In the three-way anal. procedure, parallel factor anal. (PARAFAC) was implemented to decompose the three-way array into a set of trilinear components. Each set of three components relates to spectral, pH and relative concentration profiles of allura red and sample matrix in the energy drink. First, UV-Vis spectra of the colorant’s acid-base pair and sample’s matrix were characterized by using the estimated spectral profile. Then, from the pH profile the pKa value was found to be 11.28 for the related colorant. Finally, allura red in energy drink samples was determined using the estimated concentration curve in the relative concentration profile. In the quantitation procedure, the working concentration range was 0.8-19.2 mg/mL. PARAFAC approach was tested in terms of selectivity, precision, and accuracy of the method. Added recovery results obtained by applying the proposed method to spiked samples were between 101.5% and 103.5%. In the application of the method to the anal. of real samples, successful results were reported. For a comparison, an ultra-performance liquid chromatog. method was developed for the quantitation of the colorant. Compared to the chromatog. method, we observed that PARAFAC model was simple and less expensive without requiring separation
From this literature《Three-way analysis-based pH-UV-Vis spectroscopy for quantifying allura red in an energy drink and determining colorant’s pKa》,we know some information about this compound(25956-17-6)Formula: C18H14N2Na2O8S2, but this is not all information, there are many literatures related to this compound(25956-17-6).
Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics