Gu Qing, Gao Xin, Zhou Qingqing, Li Yongquan, Li Guoqiang, Li Ping
Key Laboratory for Food Microbial Technology of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China.
Key Laboratory for Food Microbial Technology of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China.
Int J Biol Macromol. 2023 Aug 15;246:125715. doi: 10.1016/j.ijbiomac.2023.125715. Epub 2023 Jul 5.
This study aimed to evaluate the physicochemical, structural and functional properties of soluble dietary fiber extracted from citrus peels (Citrus unshiu) by ultrasound-assisted alkaline extraction. Unpurified soluble dietary fiber (CSDF) was compared with purified soluble dietary fiber (PSDF) in terms of composition, molecular weight, physicochemical properties, antioxidant activity, and intestinal regulatory capacity. Results showed that the molecular weight of soluble dietary fiber was >15 kDa, which showed good shear thinning characteristics and belonged to non-Newtonian fluid. The soluble dietary fiber showed good thermal stability under 200 °C. The contents of total sugar, arabinose and sulfate in PSDF were higher than those in CSDF. At the same concentration, PSDF showed stronger free radical scavenging ability. In fermentation model experiments, PSDF promoted the production of propionic acid and increased the abundance of Bacteroides. These findings suggested that soluble dietary fiber extracted by the ultrasound-assisted alkaline extraction has good antioxidant capacity and promotes intestinal health. It has broad development space in the field of functional food ingredients.
本研究旨在评估通过超声辅助碱性提取法从温州蜜柑果皮中提取的可溶性膳食纤维的物理化学、结构和功能特性。将未纯化的可溶性膳食纤维（CSDF）与纯化的可溶性膳食纤维（PSDF）在组成、分子量、物理化学性质、抗氧化活性和肠道调节能力方面进行比较。结果表明，可溶性膳食纤维的分子量>15 kDa，具有良好的剪切变稀特性，属于非牛顿流体。可溶性膳食纤维在200℃以下表现出良好的热稳定性。PSDF中总糖、阿拉伯糖和硫酸盐的含量高于CSDF。在相同浓度下，PSDF表现出更强的自由基清除能力。在发酵模型实验中，PSDF促进了丙酸的产生并增加了拟杆菌的丰度。这些发现表明，通过超声辅助碱性提取法提取的可溶性膳食纤维具有良好的抗氧化能力并促进肠道健康。它在功能性食品成分领域具有广阔的发展空间。
