Sang Jiaqi, Li Lu, Wen Jing, Gu Qingqing, Wu Jijun, Yu Yuanshan, Xu Yujuan, Fu Manqin, Lin Xian
Sericulture and Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China.
Foods. 2021 Nov 11;10(11):2772. doi: 10.3390/foods10112772.
Ultrasound-assisted enzymatic treatment was used to treat Newhall navel orange peel and residue, and then the structural, physicochemical and functional properties of extracted soluble dietary fibers (SDF) and insoluble dietary fibers (IDF) were investigated. The structural properties were determined using scanning electron microscopy, X-ray diffraction, FT-IR and monosaccharide composition. Among these dietary fibers, residue-SDF showed a more complex structure, while peel-IDF exhibited a looser structure. Four samples showed representative infrared spectral features of polysaccharides, typical cellulose crystalline structure and diverse monosaccharide composition. Furthermore, residue-IDF exhibited higher oil-holding capacity (2.08 g/g), water-holding capacity (13.43 g/g) and nitrite ion adsorption capacity (NIAC) than other three samples, and residue-SDF showed the highest swelling capacity (23.33 mL/g), cation exchange capacity (0.89 mmol/g) and cholesterol adsorption capacity (CAC) among these dietary fibers. In summary, this study suggests that the residue-SDF and residue-IDF could be used as the ideal dietary fibers for application in the functional food industry.
采用超声辅助酶解法处理纽荷尔脐橙皮和残渣，然后对提取的可溶性膳食纤维（SDF）和不溶性膳食纤维（IDF）的结构、理化性质及功能特性进行研究。利用扫描电子显微镜、X射线衍射、傅里叶变换红外光谱和单糖组成来测定其结构性质。在这些膳食纤维中，残渣-SDF结构更为复杂，而果皮-IDF结构较为松散。四个样品均呈现出多糖典型的红外光谱特征、典型的纤维素晶体结构以及多样的单糖组成。此外，残渣-IDF的持油能力（2.08 g/g）、持水能力（13.43 g/g）和亚硝酸根离子吸附能力（NIAC）均高于其他三个样品，而残渣-SDF在这些膳食纤维中溶胀能力最高（23.33 mL/g）、阳离子交换能力（0.89 mmol/g）和胆固醇吸附能力（CAC）最强。综上所述，本研究表明残渣-SDF和残渣-IDF可作为功能性食品工业应用的理想膳食纤维。
