College of Light Industry, Liaoning University, No. 66 Chongshan Middle Road, Huanggu District, Liaoning Province, Shenyang, 110036, People's Republic of China.
Party School of Liaoning Provincial Party Committee, Shenyang, 110161, People's Republic of China.
Sci Rep. 2021 Jan 13;11(1):1024. doi: 10.1038/s41598-020-80410-1.
Turnip (Brassica rapa L.) is widely consumed as a vegetable and traditional Chinese medicine with high dietary fiber content. Soluble dietary fiber (SDF) and insoluble dietary fiber (IDF) were obtained from white turnips, and the IDF was modified with alkaline hydrogen peroxide to obtain modified IDF (MIDF) and modified SDF (MSDF). The compositional, structural, and functional properties of the four samples were investigated. After modification, the modified dietary fibers (MDFs) showed smaller particle sizes and lower contents of pectin and polyphenol than those of unmodified dietary fibers (DFs) The results of scanning electron microscopy (SEM), Fourier transformed infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) and differential scanning calorimetry (DSC) showed that compared to the DFs, the MDFs were smaller and had more exposed hydroxyl groups. Analysis of the microrheological behaviors showed that the MDFs had higher viscosity than that of the DFs, with a looser structure for the MSDF and a stable structure for the MIDF. Therefore, due to structural changes, the physical and functional properties of the MDFs were improved compared to those of the unmodified DFs. Pearson correlation analysis showed that the particle size was positively correlated with the pectin content. The water holding capacity (WHC), oil adsorption capacity (OAC) and water swelling capacity (WSC) showed positive correlations with each other. This work indicated that white turnip could be a potential new source of DFs, which presented desirable functional properties after modification.
萝卜（ Brassica rapa L.）作为一种蔬菜和传统中药被广泛食用，具有较高的膳食纤维含量。本研究从白萝卜中提取并分离出不溶性膳食纤维（IDF）和可溶性膳食纤维（SDF），然后用碱性过氧化氢对 IDF 进行改性，得到改性不溶性膳食纤维（MIDF）和改性可溶性膳食纤维（MSDF）。对这 4 种膳食纤维的组成、结构和功能特性进行了研究。改性后，改性膳食纤维（MDFs）的颗粒尺寸较小，果胶和多酚的含量低于未改性膳食纤维（DFs）。扫描电子显微镜（SEM）、傅里叶变换红外（FT-IR）光谱、X 射线衍射（XRD）和差示扫描量热法（DSC）的结果表明，与 DFs 相比，MDFs 的粒径较小，且暴露的羟基较多。微流变行为分析表明，MDFs 的黏度高于 DFs，MSDF 的结构较疏松，MIDF 的结构较稳定。因此，由于结构的改变，MDFs 的物理和功能特性得到了改善。Pearson 相关性分析表明，粒径与果胶含量呈正相关。持水力（WHC）、吸油能力（OAC）和膨胀能力（WSC）之间呈正相关。该研究表明，白萝卜是膳食纤维的一种潜在新来源，经改性后具有理想的功能特性。
