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• W2894086140 abstract "A series of arborescent poly(l-glutamic acid)s of generations 0 to 3 (PGA(GY) with Y = 0–3) were randomly labeled with 1-pyrenemethylamine to yield several Py-PGA(GY) constructs with pyrene contents ranging between 2.5 and 22 mol %. The density (ρ) of the interior of the PGA(GY) samples was estimated in N,N-dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) by conducting gel permeation chromatography and dynamic light scattering experiments to determine their molar mass and hydrodynamic diameter, respectively. It was determined that ρ increased with the generation number from PGA(G1) to PGA(G2), which promoted more contacts between the pyrene labels. The increase in the number of pyrene–pyrene contacts was quantified with the parameter Nblob obtained by analysis of the fluorescence decays for the Py-PGA(GY) samples in DMF and DMSO. In the analysis, Nblob represented the number of structural units, i.e., glutamic acid residues, comprised inside the volume probed by an exited pyrene, termed a blob. Inside a blob, pyrene excimer formation (PEF) could occur upon diffusive encounters between an excited- and a ground-state pyrene label. It was found that Nblob increased with the generation number, and larger Nblob values were retrieved in DMSO as compared to DMF because the oligo(l-glutamic acid) (OGA) side chains in the PGA(GY) samples underwent partial loss of helicity in DMSO, which increased their hydrodynamic volume and forced the side chains closer to each other, thus resulting in more pyrene–pyrene contacts and larger Nblob values. The trends observed for Nblob in DMF as a function of the generation number could be correlated theoretically with the degree of polymerization of the OGA side chains used to prepare the PGA(GY) samples and their internal density ρ. The good agreement found between the theoretical and experimental Nblob values confirms that pyrene is an excellent probe to study the complex interior of partially structured polypeptides." @default.
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• W2894086140 date "2018-10-01" @default.
• W2894086140 modified "2023-09-26" @default.
• W2894086140 title "Arborescent Poly(<scp>l</scp>-glutamic acid)s as Standards To Study the Dense Interior of Polypeptide Mesoglobules by Pyrene Excimer Fluorescence" @default.
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• W2894086140 doi "https://doi.org/10.1021/acs.macromol.8b01721" @default.
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