Composite Mesona chinensis polysaccharide (MCP) and wheat starch gels were studied using solid-state NMR, whereby close proximity (5 Å) between MCP and glucan polymers was established, indicating that both polymers interacted at molecular level. Rheological and amylose leaching data showed that this interaction was primarily between MCP and amylose leached during gelatinisation. The elastic modulus (G′) and hardness of gels containing high starch concentration (≥8% w/w) was decreased at low (<3% w/w) MCP level and subsequently increased by more than 35% at 5% w/w MCP. In contrast, when starch concentration was lowered (5% w/w), the viscoelasticity gradually increased in the presence of MCP. Microscopy, DSC and syneresis data showed that a heterogeneous gel network microstructure was formed when there was insufficient MCP and/or amylose, which reduced the final G′ and hardness of the gels, and accelerated their retrogradation.
Food Hydrocolloids – Elsevier
Published: Jun 1, 2018
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