Molecular dynamics of polyglutamic acid studied by perturbed angular correlation of gamma rays

Abstract

The technique of perturbed angular correlations of gamma rays has been used to study the motion in aqueous solution of two molecular weight species of polyglutamic acid (M.W.=14 700 and 98 000). The rotational correlation times were determined to be τc(14 700) =14+5−3 ns and τc(98 000) =145+45−30 ns. Using a simple model, the mean molecular radii were found to be R (14 700) =19±2 Å and R (98 000) =32±3 Å. Values were also determined for the quadrupole interaction frequencies and asymmetry parameters.