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For optimal results in HPLC analysis, it is recommended to measure absorbance at a wavelength that matches the absorption maximum of the compound(s) being analyzed. The UV spectrum shown can assist in selecting an appropriate wavelength for your analysis. Please note that certain mobile phases and buffers may block wavelengths below 230 nm, rendering absorbance measurement at these wavelengths ineffective. If detection below 230 nm is required, it is recommended to use acetonitrile and water as low UV-transparent mobile phases, with phosphoric acid and its salts, sulfuric acid, and TFA as buffers.
For some compounds, the UV-Vis Spectrum is affected by the pH of the mobile phase. The spectra presented here are measured with an acidic mobile phase that has a pH of 3 or lower.

High Performance Liquid Chromatography (HPLC) Method for Separation of Methyl Red, Ethyl red on Primesep 100 by SIELC Technologies.

Methyl Red, also known as C.I. Acid Red 2, is a dark-red, single-charged basic dye that turns a deep red in acidic (low pH) solutions and yellow at solution with pH above 6.2. It has the chemical formula C₁₅H₁₅N₃O₂. You can find detailed UV spectra of Methyl Red and information about its various lambda maxima by visiting the following link.

Ethyl red is a pH indicator with C₁₇H₁₉N₃O₂ as its molecular structure. When the pH transitions from acidic to neutral, Ethyl red turns from yellow to red, hence the name. Outside of experiments, it is occasionally used as a dye in textiles and foods. You can find detailed UV spectra of Ethyl Red and information about its various lambda maxima by visiting the following link.

Methyl Red, Ethyl red can be separated, retained, and analyzed on a Primesep 100 mixed-mode stationary phase column using an isocratic analytical method with a simple mobile phase of water, Acetonitrile (MeCN), and a sulfuric acid (H2SO4) buffer. This analysis method can be detected in the Visible spectrum at 520 nm.

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HPLC Method for Analysis of Methyl Red on Primesep 100 by SIELC Technologies.

Methyl Red, also known as C.I. Acid Red 2, is a dark-red, single-charged basic dye that turns a deep red in acidic (low pH) solutions and yellow at solution with pH above 6.2. It has the chemical formula C₁₅H₁₅N₃O₂. You can find detailed UV spectra of Methyl Red and information about its various lambda maxima by visiting the following link.

Methyl Red can be retained and analyzed on a Primesep 100 mixed-mode stationary phase column using an isocratic analytical method with a simple mobile phase of water, Acetonitrile (MeCN), and a sulfuric acid (H2SO4) buffer. This analysis method can be detected in the Visible spectrum at 520 nm.

Condition

Description

HPLC Method for Methyl Red, Alizarin, Eosin Y, Fluorescein, Nile Blue A, Patent Blue Violet (Patent Blue), Resazurin, Carmine, Pararosaniline Hydrochloride, 3-Aminoacridine, Fluorescein on Newcrom R1 by SIELC Technologies

High Performance Liquid Chromatography (HPLC) Method for Analysis of Methyl Red, Alizarin, Eosin Y, Fluorescein, Nile Blue A, Patent Blue Violet (Patent Blue), Resazurin, Carmine, Pararosaniline Hydrochloride, 3-Aminoacridine, Fluorescein

Alizarin a red pigment that comes as a red powder with a slight orange tint. When dissolved it appears bright red with a slight pink undertone. Alizarin is also known as Mordant Red 11 or Turkey Red. Eosin Y is a pigment that comes as an orange powder that when dissolved in water turns bright orange. Eosin is a fluorescent staining agent. It is used to stain red blood cells, proteins on cytoplasm, collage, and muscle fibers. It is also fluorescence. Fluorescein is a dye that comes in a dark orange powder and is used as a tracer and an indicator. As it says in the name, it is also Fluorescent, obtaining a green-yellow color when under black light. Methyl red an indicator that turns red in acidic solutions (below 4.4 pH), is a shade of orange between 4.5 and 6.1 pH, and turns bright yellow in basic solutions (above pH 6.2). Nile blue, also known as Nile blue A, is used as a stain used in biology and histology as well as a pH indicator. In pH below 7 it becomes lighter shades of glue, and at pH 0 becomes almost completely translucent. At pH of seven it has a dark blue shade, while at pH higher than that it starts becoming more red. Pararosaniline Hydrochloride, also known as Basic Red 9, or C.I. 42500. It is a a magenta solid that is used as a dye. Patent Blue Violet, also known as Patent Blue, is a deep blue pigment that is often used to dye clothes. Resazurin is a blue dye as well as a pH indicator. At pH 3.8 or lower, it is bright orange, but the higher the pH the more blue it becomes, the color stops changing at the pH of 6.5 where it becomes indigo. Newcrom R1, a column that takes advantage of the newest technologies, does not contain embedded acidic nor basic ionizable groups and can retain dyes. The method is UV compatible and can be used as a general approach for analyzing similar compounds.