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• W1997925193 abstract "Nicotinamide is a hydrotropic agent that has been reported to self-associate in aqueous solution. The objective of this study is to characterize the self-association of nicotinamide with regard to the extent of self-association as well as association constants using light-scattering and vapor pressure osmometry. Both methods allow calculation of association constants; however, while light-scattering measurements depend on the size of particles in solution, vapor pressure osmometry depends on the number of particles in solution. Using light-scattering, nicotinamide was found to associate primarily as dimers and trimers. Higher order aggregates can be characterized by an average aggregation number of 4.37. The association constants were 9.99 L/mol and 13.1 L/mol for dimerization and trimerization, respectively. From vapor pressure osmometry data were calculated a dimerization constant of 0.203 L/mol and a trimerization constant of 14.1 L/mol. In comparison, the trimerization constants are in good agreement, while the dimerization constants differ by an order of magnitude. Since light-scattering measurements are less reliable for small molecules like nicotinamide at low concentrations, it is felt that the dimerization constant calculated from vapor pressure osmometry is the more accurate." @default.
• W1997925193 created "2016-06-24" @default.
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• W1997925193 date "1996-08-01" @default.
• W1997925193 modified "2023-09-25" @default.
• W1997925193 title "Self-Association of Nicotinamide in Aqueous Solution: Light-Scattering and Vapor Pressure Osmometry Studies" @default.
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• W1997925193 doi "https://doi.org/10.1021/js9505197" @default.
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