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- W4246184029 abstract "Interparticle interaction and structure of glycogen from a shell fish (mussels) were studied in water and 0.5 N NaOH by static and dynamic light scattering and viscometry. A concentration regime up to 30% w/v was covered. Beyond the overlap concentration a large-scale clustering was observed which was interpreted as associates. Glycogen is a natural representative for hyperbranched polysaccharides. Interpretation of data was made for the inverse forward scattering (at scattering angle θ = 0). The measured quantities could be separated into interparticle interaction contributions and a change in the particle structure when the concentration was increased. A master curve was obtained for X < 1 when plotting Mw/Mapp(c) against X = A2Mwc = c/c*, where Mapp(c) is the apparent (measured) molar mass at concentration c. This master curve agrees within experimental error with that for amylopectin. Deviations to a flatter curve were found when X > 1. Simultaneously to the forward scattering the apparent radius of gyration Rapp(c) was measured. The influence of interparticle interaction could be split off, and the true Rg(c) was obtained. Up to X = 1 no change was observed, but at X > 1 a sharp increase in the dimensions by 2−3 orders in magnitude was found. Similar behavior was found also in dynamic light scattering where a slow mode of motion became noticeable at X > 2. These three effectsdeviation from the interaction master curve, increase in Rg(c), and development of a slow mode of motiongive strong evidence for onsetting association. The specific viscosity showed common behavior with a weak increase in the dilute regime and a strong increase in the semidilute regime. The kink points were found with c[η] = 0.57 and 0.82 for NaOH and H2O, respectively, much smaller than c[η] ≅ 4 as observed for most linear macromolecules. However, a very good agreement with latex particles was found." @default.
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- W4246184029 date "1999-11-13" @default.
- W4246184029 modified "2023-09-27" @default.
- W4246184029 title "Solution Properties of Glycogen. 2. Semidilute Solutions" @default.
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- W4246184029 doi "https://doi.org/10.1021/ma991112h" @default.
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