Radio frequency drying on functional diversity of tiger nut flour: Effects on physicochemical, structural, and rheological properties

螺母 流变学 食品科学 化学 材料科学 复合材料 物理 声学
作者
Mengge Li,Yingqi Tian,Liu‐Min Fan,Juanjuan Xu,Longlong Jiang,Rui Li,Shaojin Wang
出处
期刊:International Journal of Biological Macromolecules [Elsevier BV]
卷期号:275: 133717-133717 被引量:1
标识
DOI:10.1016/j.ijbiomac.2024.133717
摘要

Tiger nut (TN) is a valuable nutrient and gluten-free tuber. To achieve high-quality TN flour as functional ingredients in food, it is essential to develop effective drying technologies for TN. Five drying methods including natural drying (Control), hot-air drying (HD), radio frequency single drying (RFSD), RF assisted hot-air drying (RFHD), and RF- vacuum drying (RFVD) were selected and compared to determine their effects on physiochemical, structural, and rheological properties of TN flour. Results showed that RF drying (RFD) significantly improved the hydration, oil-absorbing, and antioxidant activity capacity, especially for RFVD. RFHD exhibited greater color (BI = 13.80 ± 0.05 and C = 10.26 ± 0.05) and reducing sugar content (253.50 ± 2.27 mg d.b.) than RFSD and RFVD. The gelatinization temperature, enthalpy value, and particle size (57.30–269.33 μm) of TN flour were reduced. The structural property results indicated that RFD reduced the relative crystallinity and short-range ordering of the flour, altered protein secondary structure, and caused the damaged microstructure in comparison with Control and HD groups. All sample gels exhibited a weak strain overshoot behavior (type III) under large amplitude oscillations, and RFD resulted in a reduced viscoelastic behavior. RFD could be an effective method to produce functional TN flour.
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