Ye Yang, Chen Fei, Lu Zhaoyi, Xiang Jingyu, Jia Guixiang, Xu Mingyi, Liu Yang, Wang Yang, Wang Xiaoling
School of Biological Engineering, Sichuan University of Science and Engineering, Yibin, 644005, China.
Zigong First People's Hospital, Zigong, 643000, China.
Sci Rep. 2025 Jun 1;15(1):19224. doi: 10.1038/s41598-025-00227-8.
Pomelo peel, as a by-product of pomelo, is abundant with in soluble dietary fiber (SDF). The SDF obtained from pomelo peel using an alkaline solution was labeled ASDF, and the ASDF that was modified using ultrasound was labeled UASDF. An investigation was conducted into the physicochemical, structural, and functional properties of the samples were investigated. The investigative results show that ultrasound modification increases SDF content from 24.0 to 28.9%, with an improvement in the water-holding and swelling capacity of SDF. However, there is little effect on the oil-holding capacity. As revealed by the structural characterization both ASDF and UASDF exhibit the typical characteristics of cellulosic polysaccharides, but UASDF is 5.63% less crystalline than ASDF, resulting in a looser porous structure. In addition, UASDF possesses high glucose adsorption capacity (29.98 mg/g) and high cholesterol adsorption capacity in the small intestine (pH = 2, 20.86 mg/g; pH = 7, 25.11 mg/g). UASDF also exerts a more significant antioxidant effect, particularly ABTS free radical scavenging rate of 80.97% (5 mg/mL). The superior adsorption capacity and antioxidant ability of UASDF are attributed to its structure. These results demonstrate that pomelo peel is applicable as an inexpensive natural dietary fiber, and that UASDF possesses excellent functional characteristics.
柚皮作为柚子的副产品，富含不溶性膳食纤维（SDF）。用碱性溶液从柚皮中提取的SDF标记为ASDF，经超声改性的ASDF标记为UASDF。对样品的物理化学、结构和功能特性进行了研究。研究结果表明，超声改性使SDF含量从24.0%提高到28.9%，SDF的持水能力和溶胀能力有所改善。然而，对持油能力影响不大。结构表征显示，ASDF和UASDF均表现出纤维素多糖的典型特征，但UASDF的结晶度比ASDF低5.63%，导致其多孔结构更松散。此外，UASDF具有较高的葡萄糖吸附能力（29.98 mg/g）和在小肠中的高胆固醇吸附能力（pH = 2时为20.86 mg/g；pH = 7时为25.11 mg/g）。UASDF还具有更显著的抗氧化作用，尤其是ABTS自由基清除率为80.97%（5 mg/mL）。UASDF优异的吸附能力和抗氧化能力归因于其结构。这些结果表明，柚皮可作为一种廉价的天然膳食纤维，且UASDF具有优异的功能特性。
