%0 Journal Article
%T Absorption Spectroscopic Determination of Solubility of Alloxazine in Aqueous Solutions
%A Alfons Penzkofer
%J Journal of Analytical Sciences, Methods and Instrumentation
%P 13-21
%@ 2164-2753
%D 2015
%I Scientific Research Publishing
%R 10.4236/jasmi.2015.52002
%X The solubility of alloxazine in aqueous solution at pH 4 (10<sup>¨C4</sup> molar HCl) and pH 10 (10<sup>¨C4</sup> molar NaOH) at room temperature is determined by absorption spectroscopic characterization. Knowledge of the solubility is needed for sample preparation and quantitative spectroscopic solution characterization. Samples of different in-weight concentration were prepared and absorption spectra were measured versus storage time. The solubility limit concentration <em>C</em><sub>sol</sub> was determined by the crossing point of the linearized absorption coefficient dependences on in-weight preparation concentration below and above the solubility limit. Values of <em><em><em style=\"white-space:normal;\">C</em></em></em><sub style=\"white-space:normal;\">sol</sub>= 9.05 ¡À 1 ¦ÌM and 14.5 ¡À 1 ¦ÌM were determined for alloxazine in aqueous solution at pH 4 and pH 10, respectively.
%K Solubility Limit Concentration
%K Alloxazine
%K Isoalloxazine
%K Absorption Method
%K Aqueous Solutions
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=57090