Sodium chloride crystallization from drying drops of albumin–salt solutions with different albumin concentrations

The salt nature of crystalline structures resulting from drying albumin–salt solutions with a low ($<$ 1 wt%) and high (7 and 9 wt%) concentration of albumin and a NaCl concentration kept at a physiological level (0.9 wt%) is experimentally substantiated. Such a conclusion is drawn from the dynamics of phase transitions, morphological studies, and differences between the physicochemical properties of albumin and salt. Obtained data give a deeper insight into the albumin and salt distributions in drying liquids.