Dietary fiber and phenolics were mainly focused on their benefits separately. The alterations in structural and functional properties of insoluble dietary fibers (IDF) -bound phenolic complexes derived from lychee pulp were investigated. The structure of the IDF-bound phenolics complexes became loose after alkaline hydrolysis treatment, which was observed by scanning electron microscopy. It would be related to the removal of phenolics such as ferulic acid (an autofluorescent phenolic) after alkaline hydrolysis treatment, which was characterized by a confocal laser scanning microscope. Furthermore, the FT-IR spectroscopy confirmed that the C–O bond was broken after alkaline hydrolysis treatment. Eleven phenolics were qualitatively and quantitatively analyzed in alkaline solution by high-performance liquid chromatography. The content of ferulic acid was between 4.79 and 5.30 μg/g. It was confirmed that ferulic acid does exist as a dietary fiber-bound phenolic complex and can be hydrolyzed by alkaline solution. Moreover, the total phenolic content (TPC), total flavonoid content (TFC), and results of FRAP and ABTS assays of “Jizui” were the highest in IDF, which were 7.91 mg/g, 5.57 mg/g, 13.49 mg/g, 9.98 mg/g, respectively. The results demonstrate that phenolics are bound to IDF, and the antioxidant activity of dietary fiber would be related to bound phenolics.

膳食纤维和酚醛树脂主要集中在它们的益处上。研究了荔枝果肉衍生的不溶性膳食纤维（IDF）结合酚复合物的结构和功能特性的变化。碱水解处理后，结合IDF的酚类配合物的结构变得松散，这通过扫描电子显微镜观察到。这与碱水解处理后酚类物质如阿魏酸（自发荧光酚类）的去除有关，这通过共聚焦激光扫描显微镜进行了表征。此外，FT-IR光谱证实碱性水解处理后C-O键断裂。通过高效液相色谱法在碱性溶液中定性和定量分析了11种酚类。阿魏酸的含量在4.79至5.30μg/ g之间。证实了阿魏酸确实以膳食纤维结合的酚络合物的形式存在，并且可以被碱性溶液水解。此外，总酚含量（TPC），总黄酮含量（TFC）以及FRAP和ABTS测定的结果IDF最高的是“ Jizui ”，分别为7.91 mg / g，5.57 mg / g，13.49 mg / g，9.98 mg / g。结果表明，酚醛树脂与IDF结合，膳食纤维的抗氧化活性与酚醛树脂有关。