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Open AccessArticle

Effect of Initial Conformation on the Starch Biopolymer Film Formation Studied by NMR

Department of Technical Physics II/Polymer Physics, Institute of Physics, Faculty of Mathematics and Natural Science, Ilmenau University of Technology, PO Box 10 05 65, D-98684 Ilmenau, Germany
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Current address: R&D Materials, Voith US Inc., Summerville, SC 29483, USA.
Molecules 2020, 25(5), 1227; https://doi.org/10.3390/molecules25051227
Received: 23 January 2020 / Revised: 3 March 2020 / Accepted: 6 March 2020 / Published: 9 March 2020
(This article belongs to the Special Issue Fluids in Porous Media)
The formation of a rigid porous biopolymer scaffold from aqueous samples of 1% w/v (suspension) and 5% w/v (gel) corn starch was studied using optical and nuclear magnetic resonance (NMR) techniques. The drying process of these systems was observed using a single-sided NMR scanner by application of the Carr–Purcell–Meiboom–Gill pulse sequence at different layer positions. The echo decays were analyzed and spin–spin relaxation times (T2) were obtained for each layer. From the depth dependent T2 relaxation time study, it was found that the molecular mobility of water within the forming porous matrix of these two samples varied notably at different stages of film formation. At an intermediate stage, a gradual decrease in mobility of the emulsion sample towards the air–sample interface was observed, while the gel sample remained homogeneous all along the sample height. At a later stage of drying, heterogeneity in the molecular dynamics was observed in both samples showing low mobility at the bottom part of the sample. A wide-angle X-ray diffraction study confirmed that the structural heterogeneity persisted in the final film obtained from the 5% corn starch aqueous sample, whereas the film obtained from the 1% corn starch in water was structurally homogeneous. View Full-Text
Keywords: starch biopolymer; porous biopolymers; film formation; NMR; dynamic heterogeneity starch biopolymer; porous biopolymers; film formation; NMR; dynamic heterogeneity
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MDPI and ACS Style

Ghoshal, S.; Mattea, C.; Denner, P.; Stapf, S. Effect of Initial Conformation on the Starch Biopolymer Film Formation Studied by NMR. Molecules 2020, 25, 1227.

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