Surface Tension And Surface Adsorption Of Undenatured Collagen Biosurfactant
Keywords
Undenatured Collagen, Surface Tension, Surface Adsorption, Saturated Adsorption Capacity, Adsorption Free Energy
Abstract
This paper examines the surface tension and surface adsorption properties of an aqueous solution of undenatured collagen biosurfactant (CBS). The results show that the surface tension of CBS aqueous solution decreases with the increase of CBS concentration, and finally levels off, reaching 55.92 mN/m. Near the isoelectric point, the static charge on the CBS surface decreases, significantly reducing its surface tension. At low temperatures, the surface activity of CBS solution is better. When the temperature continues to rise (>35¡ãC), the surface tension of CBS solution increases sharply due to denaturation. The adsorption of CBS aqueous solution belongs to Langmiur type adsorption. According to the ¦Ã-lgC, ¦£-C and C/¦£-C fitting curves, the saturated adsorption amounts are similar, which are 1.86¡Á10^-10, 1.97¡Á10^-10 and 2.03 respectively. ¡Á10^-10 mol/cm^2. The adsorption free energy is -3.53 kJ/mol, indicating that it can proceed spontaneously under standard conditions.
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Original research was done by Liu Wentao, Li Conghu, Li Guoying, Duan Lian, Tian Zhenhua
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