science-softCon uv/vis+ photochemistry database;	www.photochemistry.org; (C) science-softCon 2019

Substance: dialuric acid		 		Other Names: 2,4,5,6-pyrimidinetetrol

Formula: C4H4N2O4					CAS-No.: 444-15-5

Study: UV absorption spectra


Authors: J.W. Patterson, A. Lazarow, S. Levey

Title: Alloxan and dialuric acid: Their stabilities and ultraviolet absorption spectra

Journal/Source: J. Biol. Chem., 177 (1), 187-196, (1949)


Data: diagram, table

Energy/Wavelength range: 250 - 325 nm

Resolution: 

Temperature: 

Temperature dependence: 

Pressure/Concentration: 0.0001 M with 0.01 M cysteine

Phase: solution

pH: 7.4


Comments: Dialuric acid in concentrated sulfuric acid was stable and dilution with water gave a spectrum with a maximum at 270 nm (epsilon = 2900).
In 1 % hydrochloric acid, dialuric acid was not stable, but the addition of 100 moles of cysteine for each mole of dialuric acid stabilized the spectrum and gave a maximum at 270 nm (epsilon = 3200). With the aid of cysteine, the spectrum of dialuric acid was also obtained at pH 7.4. It showed a maximum at 275 nm (epsilon = 16500).

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