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Figure1.Chemical structure of polyvinylpyrollidone.

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Figure2.UV-vis spectrum of polyvinylpyrollidone.Note the maximum at 213.5.Quantitation in this paper was performed on the slope at220nm.Figure3.Chromatogram of polyvinylpyrollidone standard.Note the sym-metrical peak eluting before the negative baseline disturbance in the total exclusion volume of the column.

Figure4.Chromatograms of an ophthalmic pharmaceutical formulation containing PVP(A),standard of PVP(B)and placebo containing pharmaceutical components but no PVP(C).2019最新国产理论

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Figure5.Chromatograms of several PVP formulations and monomer.(A):several PVP formulations representing molecular weights from10–360kDa.Note that all elute in the total exclusion volume and the well-retained monomer.(B):Separation of the30kDa PVP used in this study from its monomer.电分离

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