Analysis of the continuous phase of the modified waxy maize starch suspension

Individual swollen starch granules under mechanical stress: evidence for deformation and volume loss

“…It was shown that it is this polymer solution and not pure water that constitutes the continuous phase of the suspension of highly swollen MWMS granules. 15 The deformation of the potato starch granule also increased to L L À1 0 z 1.8 for accumulated strains around 1000 and then stayed constant within experimental error.…”

“…Secondly, the droplets can be very small because the liquid released is not water but amylopectin solution, as far as dilute amylopectin solution of low molecular weight, $10 6 was detected after the centrifugation of a suspension of swollen MWMS granules. 15 The presence of a polymer dissolved in water decreases the interfacial tension between the droplet and PDMS, as compared with pure water/PDMS, and thus may decrease the size of the droplet detached. A very similar loss of volume under shear, due to solvent ejection into the suspending medium, was observed for a micro-gel particle swollen in a linear polymer solution.…”

“…Dilute low molecular weight ($10 6 ) amylopectin solution was found as a continuous phase in a suspension of swollen MWMS granules. 15 Potato starch is composed of amylose and amylopectin. The granules usually burst when heated and thus special precautions were taken for this not to occur, as described in the Experimental section.…”

Molecular weight analysis of starches: Which technique?

“…A similar approach was applied by Ramesh and co‐workers specifically on debranched rice starch. More recently, Desse et al looked at low molecular weight waxy maize starch (Novation 2600 from National Starch, Hamburg) from the supernatant solution surrounding starch granules dispersed in water and (after removal of the granules) obtained values of (1.20 ± 0.03) × 10 6 g/mol − (1.72 ± 0.02) × 10 6 . Yoo et al applied MALS directly to estimate molecular weights of amylopectins from wheat cultivars and found values ranging from ∼30 × 10 6 to 350 × 10 6 g/mol.…”

“…From the areas under the curves, the relative proportions of the different components can be determined. The method has been applied to the study of a range of amyloses , and damaged starches , modified waxy‐maize and starch modified magnetite particles . To minimise the effects of non‐ideality, low concentrations should be employed, and loading concentrations of 0.05–0.1 mg/mL are usually sufficient to give a sufficient signal: At concentrations <0.1 mg/mL non‐ideality effects are usually small.…”