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• W2079174901 abstract "We quantify the hydrodynamic screening length (ξ) in κ-carrageenan solutions by observing restrictions on the diffusion of several pullulan probes, each with a different molecular weight (Mw). The diffusion coefficient of pullulan in a pure solvent (Dpull,0) and a κ-carrageenan solution (Dpull) were measured using a pulsed field gradient stimulated spin-echo 1H nuclear magnetic resonance. The hydrodynamic radii (RH) of the pullulan samples were determined using Dpull,0 measured at 25 °C and the Stoke–Einstein equation. The echo signal intensity of κ-carrageenan without a gradient, Ikappa(0), decreased steeply at around the sol-to-gel transition temperature (Tsg), suggesting that the κ-carrageenan chains formed helical aggregates at Tsg diluting the solute κ-carrageenan concentration. The ratio, Dpull/Dpull,0, was less than 1, indicating that the mobility of pullulan was restricted by the κ-carrageenan chains. Over the entire temperature range, pullulan with larger molecular size yielded more restrictions on the molecular mobility, and Dpull/Dpull,0 decreased as the Mw of pullulan increased. Below Tsg, Dpull/Dpull,0 increased as the temperature decreased. This behavior suggests that a decrease in the restriction degree by the κ-carrageenan chains is concomitant with the formation of aggregates. To quantify the restriction degree, ξ was estimated at various temperatures using the relation Dpull/Dpull,0=exp(−RH/ξ). The hydrodynamic screening length ξ in κ-carrageenan solution was estimated by observing the restriction on the diffusion of pullulan probes with different molecular weights. Signal intensity of κ-carrageenan chains without gradient Ikappa(0) decreased and ξ increased below the sol-to-gel transition temperature Tsg. It is considered that κ-carrageenan chains formed helical aggregates, and enlarged the networks of solute κ-carrageenan chains and the aggregates." @default.
• W2079174901 created "2016-06-24" @default.
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• W2079174901 date "2012-06-13" @default.
• W2079174901 modified "2023-09-27" @default.
• W2079174901 title "Estimation of the hydrodynamic screening length in κ-carrageenan solutions using NMR diffusion measurements" @default.
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• W2079174901 doi "https://doi.org/10.1038/pj.2012.107" @default.
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