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- W2090136053 abstract "The interaction between pinacyanol chloride and sodium alginate or guluronate-rich alginate is found to effect profound changes in the visible absorbance and circular dichroism spectra. Two different types of aggregates are observed depending on the relative dye/alginate concentrations. With a dye/alginate ratio at 1:1, a complex is deduced based on an analysis of Job's method and conductometric titrations. Another complex forms at 1:10 dye/alginate ratio and only in the presence of alginate or guluronate-rich alginate. The two aggregates are in dynamic equilibrium according to the presence of isosbestic points in the visible spectra. The effects of pH and divalent cations on the spectra are studied. The 1:10 complex is damaged by addition of hydrochloric acid and divalent cations; however, at low concentration of these agents the spectra indicate conversion of the complex into the 1:1 aggregate. Models for the two complexes are proposed taking into account the preference of guluronate binding sites for chelating ions." @default.
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- W2090136053 date "2009-09-01" @default.
- W2090136053 modified "2023-10-05" @default.
- W2090136053 title "Induced circular dichroism of the interaction between pinacyanol and algal alginates" @default.
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- W2090136053 doi "https://doi.org/10.1016/j.carres.2009.06.026" @default.
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