The effects of cellulase hydrolysis separately combined with hydroxypropylation, carboxymethylation and phosphate crosslinking on the physicochemical properties and antioxidant activity of millet bran dietary fibre (MBDF) were investigated. Compared to cellulase hydrolysis alone, these dual modifications more effectively improved the soluble fibre content, water-swelling ability, viscosity, emulsifying capacity and cation-exchange capacity of MBDF but reduced the emulsion stability, brightness and polyphenol content of MBDF (P < 0.05). MBDF modified by cellulase hydrolysis combined with hydroxypropylation showed the highest emulsifying capacity (60.03 m²/g) and oil-adsorption capacity (3.32 g/g) but the lowest nitrite ion-adsorbing ability (NIAA). MBDF modified by cellulase hydrolysis with carboxymethylation showed the highest surface hydrophobicity, cation-exchange capacity (0.352 mmol/g) and NIAA (152.89 μg/g). MBDF modified by cellulase hydrolysis combined with phosphate crosslinking exhibited excellent copper ion-adsorbing ability (19.97 mg/g) and viscosity (19.33 cp). Moreover, these dual modifications all enhanced the Fe²⁺ chelating ability and reducing power of MBDF (P < 0.05).

研究了纤维素酶水解分别结合羟丙基化、羧甲基化和磷酸盐交联对小米麸皮膳食纤维（MBDF）理化性质和抗氧化活性的影响。与单独使用纤维素酶水解相比，双重修饰更有效地提高了MBDF的可溶性纤维含量、水溶胀能力、粘度、乳化能力和阳离子交换能力，但降低了MBDF的乳液稳定性、亮度和多酚含量（P  < 0.05） . 纤维素酶水解结合羟丙基化修饰的MBDF表现出最高的乳化能力（60.03 m ²/g) 和吸油能力 (3.32 g/g)，但亚硝酸根离子吸附能力 (NIAA) 最低。通过纤维素酶水解和羧甲基化修饰的 MBDF 显示出最高的表面疏水性、阳离子交换容量 (0.352 mmol/g) 和 NIAA (152.89 μg/g)。通过纤维素酶水解结合磷酸盐交联改性的 MBDF 表现出优异的铜离子吸附能力 (19.97 mg/g) 和粘度 (19.33 cp)。此外，这些双重修饰都增强了 MBDF 的 Fe ²⁺螯合能力和还原能力（P  < 0.05）。