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Mid-infrared Spectroscopic Measurement of Ionic Dissociative Materials in the Metabolic Pathway

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Abstract:

We determine the pH dependency of the mid-infrared spectra in aqueous solution of the organic dissociative materials in the metabolic pathway: saccharide phosphates (G6P, F6P), adenosine, and its phosphates (ATP, ADP, AMP). The series of molar absorbance spectra for these reagents were obtained in a pH range of about 2 to 11 with a Fourier transform infrared (FT-IR) spectrometer equipped with a horizontal diamond attenuated total reflection (ATR) sampling accessory. We also provide a method of infrared spectral extraction of ionic dissociative materials by performing a linear least-square fitting utilizing the formulas of ionic dissociation equilibrium shift, and we obtain the infrared spectrum of each ionic species of the dissociative materials: G6P-, G6P2-; F6P-, F6P2-; ATP2-, ATP3-, ATP4-; ADP-, ADP2-, ADP3-; AMP, AMP-, AMP2-; and adenosine+, adenosine0. The infrared spectral structure of each ionic species of the dissociative materials in the metabolic pathway are discussed. Additionally, the possibility for a quantification system of the concentrations of the organic dissociative materials in varying pH is suggested.

Keywords: ADP; AMP; ATP; DISSOCIATION EQUILIBRIUM; DISSOCIATIVE MATERIALS; F6P; G6P; INDEX HEADINGS MID-INFRARED SPECTROSCOPY; IS; METABOLIC PATHWAY; PH; SUGGESTED.; VARYING

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370203322640152

Publication date: December 1, 2003

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