The behavior of gelatin chemically modified with N-hydroxysuccinimide ester of caprylic acid at the aqueous (NH2)2SO4 solution-air interface is studied. The compression isotherms of gelatin monolayers whose pattern is dependent on the degree of gelatin modification are obtained. It is established that the area corresponding to the beginning of isotherm rise, two-dimensional pressure of completely compressed monolayer, and the modulus of monolayer surface elasticity increase with the degree of gelatin hydrophobization. The surface ("adsorption") activity of gelatin with the modification degree of 85% is approximately threefold higher than for the initial gelatin.
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ACKNOWLEDGMENTS This work was supported by the Russian Foundation for Basic Research, project no. 01-03-32129.