Unveiling lotus root processing under vacuum microwave: starch–malic acid interactions based on moisture, structure, and in vitro digestibility

IF 9.8 1区农林科学 Q1 CHEMISTRY, APPLIED

Food Chemistry Pub Date : 2025-01-11 DOI:10.1016/j.foodchem.2025.142862

Yiyang Yu, Dianbin Su, Huihui Xu, Weiqiao Lv, Hualu Song, Falan Li, Wenping Zhao, Xia Sun, Yemin Guo

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Abstract

This study evaluated the effects of malic acid vacuum microwave preconditioning (MVMP) on lotus root (LR) by examining its moisture content, dielectric properties, microstructure, and starch characteristics, including modifications in starch structure and composition. Dielectric properties and LF-NMR indicated that the dielectric constant (ε') was closely associated to moisture content and state, while changes in water migration depended on microwave power and the dielectric loss factor (ε″). Increased microwave power and malic acid concentration resulted in microstructural damage (indentation and breakage of starch granules) and starch hydrolysis into smaller particles. MVMP preserved higher levels of phenolic and flavonoid compounds. FT-IR analysis revealed an additional absorption peak at 1740 cm⁻¹. The maximum degree of substitution was 0.131. Starch from MVMP-treated LR exhibited higher crystallinity, with a maximum resistant starch (RS) content of 68.3 %. In addition, microwave power considerably influenced amylose content, solubility, swelling power, and thermal enthalpy.

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揭示真空微波下藕加工：淀粉-苹果酸相互作用的水分、结构和体外消化率

本研究通过考察苹果酸真空微波预处理（MVMP）对莲藕（LR）水分含量、介电性能、微观结构和淀粉特性（包括淀粉结构和成分的改变）的影响，评价了苹果酸真空微波预处理（MVMP）对莲藕（LR）的影响。介电性质和LF-NMR表明，介电常数ε′与材料的含水量和状态密切相关，而水分迁移的变化取决于微波功率和介电损耗因子ε″。增加微波功率和苹果酸浓度会导致淀粉颗粒的微结构破坏（压痕和破裂）和淀粉水解成更小的颗粒。MVMP保存了较高水平的酚类和类黄酮化合物。FT-IR分析显示在1740 cm−1处有一个额外的吸收峰。最大替代度为0.131。经mvmp处理的LR淀粉结晶度较高，最大抗性淀粉（RS）含量为68.3% %。此外，微波功率显著影响直链淀粉含量、溶解度、溶胀力和热焓。

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来源期刊

Food Chemistry 工程技术-食品科技

CiteScore

16.30

自引率

10.20%

发文量

3130

审稿时长

122 days

期刊介绍： Food Chemistry publishes original research papers dealing with the advancement of the chemistry and biochemistry of foods or the analytical methods/ approach used. All papers should focus on the novelty of the research carried out.