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- W2003676312 abstract "Asymmetrical flow field-flow fractionation (FFF) with multi-angle light scattering (MALS) detection was applied for the fractionation of amylopectins from four different sources. Samples originated from genetically modified potatoes and waxy maize. Amylopectins were dissolved in a 1 mol l(-1) sodium hydroxide solution or water. With an injected mass of 0.2 microg, well below overloading conditions, a decrease of the apparent hydrodynamic radius with increasing inlet flow-rate was observed. Moreover, a decrease of the radius of gyration with increasing elution volume was recorded by the MALS detector. Steric/hyperlayer effects are a feasible explanation for this behaviour. The observed radius of gyration at the steric inversion point was in the order of 0.3 microm, which is smaller than the theoretically calculated inversion point. Apparently, the amylopectin behave as macromolecules with a larger hydrodynamic radius than expected on basis of their radius of gyration and are subjected to significant lift forces. The results were confirmed by four fractionations with varying flow-rates but constant ratio of cross to outlet-flow. In contrast to the normal mode operation, the retention of the amylopectins depended strongly on the applied flow-rates and was close to that of a much smaller 10 kDa dextran. Apparent molar masses in the order of between 10(7) and 10(9) g mol(-1) were obtained. The results are contrasted with enzymatically degraded and oxidised starch samples that were fractionated in the normal mode." @default.
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- W2003676312 date "2001-08-01" @default.
- W2003676312 modified "2023-10-09" @default.
- W2003676312 title "Retention behaviour of amylopectins in asymmetrical flow field-flow fractionation studied by multi-angle light scattering detection" @default.
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- W2003676312 doi "https://doi.org/10.1016/s0021-9673(01)01020-2" @default.
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