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Polymer-Solvent Interactions in Modified Starches Pastes-Electrokinetic, Dynamic Light Scattering, Rheological and
Agnieszka Makowska1, Krzysztof Dwiecki2, Piotr Kubiak3
1Department of Food Technology of Plant Origin, Poznań University of Life Sciences, 60-624 Poznań, Poland.
Polymers
|July 27, 2022
Summary
This study clarifies starch paste behavior by analyzing rheological properties, low field nuclear magnetic resonance (LF NMR), dynamic light scattering (DLS), and zeta potential. Findings reveal pH buffering impacts consistency, while LF NMR and rheology show correlated changes in starch-water interactions.
Area of Science:
- Food science and technology
- Materials science
- Physical chemistry
Background:
- Starch paste exhibits complex dispersion behavior, defying simple classification as solution, colloid, or suspension.
- Ambiguities in starch paste characterization hinder technological advancements.
Purpose of the Study:
- To investigate starch macromolecule-water interactions.
- To analyze the influence of pH buffering on starch paste properties.
Main Methods:
- Rheological property analysis
- Low field nuclear magnetic resonance (LF NMR) spectroscopy
- Dynamic light scattering (DLS)
- Zeta potential measurements
Main Results:
- pH buffering significantly reduced consistency index, though specific pH values had minor impact.
- LF NMR revealed reduced spin-lattice and spin-spin relaxation times upon starch dissolution, correlating with rheological findings.
- Zeta potential was mainly influenced by inherent starch properties rather than environmental conditions.
Conclusions:
- The study demonstrates the complementarity of rheology, LF NMR, DLS, and zeta potential for characterizing starch pastes.
- Understanding these interactions is crucial for advancing starch-based material applications.
