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Acid-base and copper (II) complexation equilibria of poly(inosinic)-poly(cytidylic)

✍ Scribed by R. Gargallo; R. Tauler; A. Izquierdo-Ridorsa

Publisher
Wiley (John Wiley & Sons)
Year
1997
Tongue
English
Weight
186 KB
Volume
42
Category
Article
ISSN
0006-3525

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✦ Synopsis

The acid-base and copper(II) complexing properties of the heteropolynucleotide poly(inosinic)-poly(cytidylic) acid were studied by means of potentiometric, spectrophotometric, CD, and molecular fluorescence titrations in a working aqueous medium of 0.15M ionic strength at 37ЊC. The study of the acid-base equilibria has proved the existence of four different species in the pH interval 2-11. Two new species are detected in the presence of copper(II) ion, at acidic and neutral pH values.

Spectrophotometric, CD, melting, and fluorescence data were treated with a multivariate curve resolution procedure that allowed the determination of the number of species simultaneously present in each system [acid-base equilibria, copper(II) complexation equilibria], and the estimation of their concentration profiles and of the pure spectra for each species. From the concentration profiles an unambiguous assignment of which species are present at any pH conditions can be made. Furthermore, the knowledge of the pure uv-visible, fluorescence, and CD spectra recovered by the proposed resolution method for each species brings important structural information. When this mathematical approach was applied to the thermal denaturation data, the melting profile and the uv pure spectra for all the different species or conformations formed in the melting process, were calculated.

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