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Abstract
The viscosity of vitamin B3in water and in different solutions ofD-fructose (D-fru)in water at different temperatures has been determined. To calculate A and B parameter of Jones Dole equation experimental values of relative viscosities were used.Feakin’s Transition-State Theory was used to determinethe activation parameters.Results have been concluded in theform of molecular interactions and structure behavior of vitamin B3in water and aqueous solutions of D-fructose.