The enzymatic hydrolysis of potato starch was performed using six amylolytic preparations of the bacterial origin. The type of the preparations was Gamalpha (Gamma Chemie, Germany). In the hydrolysis reaction, there were used two kinds of starches; the first one was gelatinized in an autoclave, and the second one was extruded. From the hydrolysis reaction, there were obtained various maltodextrins of a DE 3-12 value. These products were characterized with regard to the composition of oligosaccharides contained in them including sugars of a polymerization degree from 1 to 8. It was shown that hydrolysates with the similar DE value significantly differed in the chemical composition of oligosaccharides. A content of oligosaccharides, with a DP from 3 to 8, in the hydrolisates produced of the autoclaved starch ranged between 8,2% and 48,5%, and in the hydrolisates of the extruded starch varied from 7,2% to 59,8%. In all the maltodextrins obtained, the maltohexaose, maltoheptaose and maltooctaose constituted the highest percentage among all the oligosaccharides. For the maltodextrins produced, viscosity and osmotic pressure profiles of their 10% water solutions were developed. For the majority of the hydrolisates, as the dextrose equivalent rose in the maltodextrins,, the apparent viscosity also rose. It was stated that with regard to the maltodextrin solutions investigated, their share rate was inversely proportional to their apparent except for the maltodextrins obtained using a Gamalpha 300L preparation. The osmotic pressure of the starch hydrolysates was proportional to their dextrose equivalent.