NMR characterization of structure and moisture sorption dynamics of damaged starch granules

FRANZONI, MARÍA BELÉN; TEOBALDI, ANDRÉS GUSTAVO; BARRERA, GABRIELA NOEL; ACOSTA, RODOLFO HÉCTOR; RIBOTTA, PABLO DANIEL; VELASCO, MANUEL ISAAC

CARBOHYDRATE POLYMERS

ELSEVIER SCI LTD

Año: 2022 vol. 285

0144-8617

Among the many biopolymers that constitute food products, starch is one of the most common. Starch granulesare often damaged in the milling process, which affects the final product quality, mainly due to changes in wateradsorption properties. In this work, the crystallinity degree of wheat starch samples as a function of the mechanicaldamage is determined by low field 1H NMR. We also introduce the use of single-sided NMR to determinegranular swelling, water distribution and sorption dynamics of the samples. Results show that the crystallinity ofthe samples decreases with the milling. We also observed that swelling index and sorption capacity values arehigher in the milled samples than in the native starch. Our experiments show how single-sided NMR is a valuabletool to provide information on dynamic processes not only in starch, but also in many carbohydrate polymericsamples with the additional benefit of spatial resolution.