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Circular dichroism spectra of (1) pure intact insulin, (2) insulin in 0.2% (w/v) chitosan solution with high Mw, (3) insulin in 0.2% (w/v) Eudragit L100-55 solution, and (4) insulin in the chitosan-Eudragit L100-55 nanoparticles. The insulin concentration was 0.2 mg/ml
