Abstract Effects of thermal pre-treatment on physicochemical properties of okara insoluble dietary fiber (IDF) during wet media milling were studied. During the milling process, control sample (without pre-treatment) showed the largest mean particle size, followed by samples under pre-treatment temperature at 80 °C, 100 °C and 120 °C, respectively. The minimum size (298.17 nm) was obtained under the temperature of 120 °C and milling time of 6 h. The IDF samples subjected to thermal pre-treatment showed disintegrated and irregular surfaces, and were presented in agglomerated form with puffed morphology after subsequent milling for 6 h. Fourier transform infrared spectroscopy and X-ray diffraction analysis revealed the modification of structural characteristics and the degradation of IDF components after thermal pre-treatment and wet milling. As the milling duration prolonged, water soluble index, Zeta potential and apparent viscosity of all the samples decreased, while swelling power abruptly increased and then gradually dropped.

中文翻译：

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热预处理对湿磨法制备纳米豆渣不溶性膳食纤维理化性质的影响

摘要 研究了热预处理对湿介质研磨过程中豆渣不溶性膳食纤维 (IDF) 理化性质的影响。在研磨过程中，对照样品（未经预处理）表现出最大的平均粒径，其次是预处理温度分别为 80 °C、100 °C 和 120 °C 的样品。在 120 °C 的温度和 6 h 的研磨时间下获得最小尺寸 (298.17 nm)。经过热预处理的 IDF 样品显示出破碎和不规则的表面，并在随后的研磨 6 小时后以具有膨化形态的团聚形式呈现。傅里叶变换红外光谱和 X 射线衍射分析揭示了热预处理和湿磨后结构特征的改变和 IDF 组分的降解。