Abstract
Lotus seed (LS) has a high starch content and possesses many useful functional properties, which are mainly attributed to its phenolic compound content. The objective of this study was to investigate the effect of microwave irradiation (MW) treatment on the structural and physicochemical properties of a lotus seed starch-chlorogenic acid (CA) blend. MW treatment appeared to promote the formation of LS-CA complexes and the modified starch displayed more rougher structures than native starch. The particle size distribution of starch remained approximately constant when the microwave power was 200 W, but increased sharply with further increases in microwave power; a similar trend was observed in the swelling and solubility of starch. XRD and FT-IR spectra show that MW treatment degraded the ordered crystalline structure of starch, facilitating exposure of the starch chains originally buried in the crystalline and amorphous regions within the grains. During this treatment, CA interacted with starch molecules by hydrogen bonding and form a LS-CA complex, which inhibited the self-assembly process of starch chains. These findings demonstrated the potential use of MW treatment in controlling the storage and processing quality of lotus seed, or other starchy foods rich in polyphenols.
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Acknowledgements
This work was supported by the Special Project for Improving the Level of Education of Fujian Province (Grant number [2019] 0761), the National Natural Science Foundation of China (Grant number 31871820 and 31972076) and the Program for Leading Talents in Science and Technology Innovation of Fujian Provincial (Grant number KRC16002A).
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Wang, J., Jiang, X., Zheng, B. et al. Structural and physicochemical properties of lotus seed starch-chlorogenic acid complexes prepared by microwave irradiation. J Food Sci Technol 58, 4157–4166 (2021). https://doi.org/10.1007/s13197-020-04881-w
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DOI: https://doi.org/10.1007/s13197-020-04881-w