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(A) Variation of the I1/I3 ratio (I373nm/I383nm). (▲) PEG-b-PGA, (□) PEG-b- PPGA17, (△) PEG-b-PPGA30 and (■) cl-PEG-b-PPGA30 nanogels. (B) The normalized emission fluorescence intensity at 373 nm (I1) for various PGA-based polypeptides and cross-linked nanogels as a function of polymer concentration at 25°C and pH 7.0. Concentration of pyrene is 6 × 10−7 M.
