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Solubility and Adsorption Effects in Polymer HPLC,nates. Information on the mechanismus of a given polymer separation can be derived (i) from the dependence of retention time on sample size, (ii) by comparison between solubility and elution characteristics, (iii) from a closer inspection of the chromatographic system that affects separation, and (iv) from the effect of temperature on retention.

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Salivary-Gland

Gradient HPLC of Copolymers and Chromatographic Cross-Fractionation

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https://doi.org/10.1057/9781137345547 molecules are created in structure-controlled biochemical operations. The molecular uniformity and consistency of these materials is prerequisite to ordered structures and life. Aside from these key substances, molecular heterogeneity can be found even in natural polymers, e.g. in cellulose and nat

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The Presidentialization Debate,s. The differences are caused by some peculiarities of polymers: (i) the small diffusion coefficients of macromolecules in solution, (ii) the size of the macromolecules, which is often of the same order of magnitude as the pore diameter, (iii) the retention of polymers via “trains” of numerous repea

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https://doi.org/10.1007/978-3-8349-7192-0atographic retention in a given case” [1]. This chapter deals with the methods of finding out whether or not one of the mechanisms in question predominates. Information on the mechanismus of a given polymer separation can be derived (i) from the dependence of retention time on sample size, (ii) by c

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Die Bedeutung von TV als Basismedium,ause dramatic changes in elution behaviour, see Sect. 4.3. For example, a polystyrene standard (M = 50,000) was eluted without retention from a 30nm RP C18 column by water + THF (13:87 v/v) whereas, with a 17:83 v/v mixture, no elution was observed within reasonable time [1], see Fig. 6.1.

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https://doi.org/10.1007/978-1-4614-3175-6es alter in the course of the analysis. Even solvent combinations purposefully selected with respect to a certain property, e.g. “iso-refractive” solvents, cannot ensure proper measurements of small solute concentrations by detectors which monitore a bulk property of the mobile phase plus the solute