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• W2039401064 abstract "The binding of copper(II) ions by heparin was investigated using equilibrium dialysi techniques, and the effects of this binding on solution properties determined. In neus tral Tris buffer solutions, heparin binds a maximum of twenty-three to twenty-four copper ions in two classes of sites, one containing three to four binding sites, the other containing twenty to twenty-one sites. Cooperative binding is associated with the larger class of sites. In more acidic citrate buffer solution, only one class of sites is observed, containing about four to five binding sites. Association constants are calculated for the classes and the possible chemical nature of the sites is discussed. The binding of calcium ions in neutral buffer is also examined, and these ions appear to be bound by a group of twenty to twenty-one binding sites, with a larger association constant than that for the copper ions. Definite effects on the solution properties of heparin, such as intrinsic viscosity, sedimentation coefficients, and partial specific volume, can be observed only in the cooperative binding of copper ions in neutral buffer. The interpretation of these solution properties in terms of molecular size and shape is analyzed, and it is concluded that the metal ion interactions cause no major change in the apparently random coil conformation of heparin in buffered solution, although some minor changes can be associated with the cooperative uptake of copper ions." @default.
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• W2039401064 date "1973-01-01" @default.
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• W2039401064 title "Interaction of the polyelectrolyte heparin with copper(II) and calcium" @default.
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• W2039401064 doi "https://doi.org/10.1002/bip.1973.360120112" @default.
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