Abstract
A change of conformation of macromolecules has been investigated at the air-water interface. The model chosen is a copolypeptide of glutamic acid and methyl glutamate. The modification of the conformation of the copolypeptide is induced by changing the pH of the support. The presence of electrostatic charges on the spread macromolecules has as consequence an abrupt change of the surface properties. Measurements of surface potential and surface viscoelasticity demonstrate a discontinuity in the surface behavior for a pH of the subphase of about 7.5 units. This result is interpreted as a transition from the helical conformation to the coiled conformation at the air-water interface.
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