Diffusion coefficients of amino acids in aqueous solutions
There are still limited experimental data of liquid d if fusion coefficients in literature.Therefore, the experimental investigation and prediction model are of practical and theoretical significance.The diffusion coe fficients of L-serine, L-threonine,L-arginine,in aqueous solution at 298.15 K were measured respectively by holographic interferometer.The affecting factors of molecular structure and polarity were analyzed and discussed.Finally, a modi fied semi-empirical model for correlating the diffusion coefficients of solid o rganic compounds in aqueous solutions at 298.15 K was proposed with an adjustab le parameter added.The average deviation between model prediction values and exp erimental ones is less than 0.2%, which shows a considerably satisfactory accur acy.