In cereals, 95% of dietary fiber is associated with phenolic compounds. The present study examined the functional properties, phenolic composition, antioxidant activity, and in vitro bioaccessibility of phenolics and flavonoids present in rye bran (RB) and its insoluble dietary fiber (IDF). Compared to RB, higher functional properties (WHC, WRC, and OHC) were represented by IDF due to its porous structure. The IDF contained lower free but higher bound phenolics and flavonoids content as compared to RB, whereas highest total phenolics (556.6 mg GAE/100 g) and flavonoids (378.3 mg RE/100 g) content were observed in IDF. Results had identified significant differences (p < .05) in phenolic acids composition between RB and IDF determined by HPLC‐MS and the total phenolic acids were higher in IDF. The antioxidant capacity of IDF was higher than RB in DPPH, FRAP, ABTS, and reducing power assay. However, the in vitro phenolics and flavonoids bioaccessibility of IDF was much lower because of its high content of bound phenolics and flavonoids.

中文翻译：

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比较评价黑麦麸及其不溶性膳食纤维的功能特性，游离和结合的酚类概况，抗氧化活性以及体外生物利用度。

在谷物中，95％的膳食纤维与酚类化合物有关。本研究检查了黑麦麸（RB）及其不溶性膳食纤维（IDF）中存在的酚类和类黄酮的功能特性，酚类组成，抗氧化活性以及体外生物利用度。与RB相比，IDF由于其多孔结构而具有更高的功能特性（WHC，WRC和OHC）。与RB相比，IDF的游离酚和类黄酮含量较低，但结合含量较高，而IDF中的总酚类含量最高（556.6 mg GAE / 100 g）和类黄酮（378.3 mg RE / 100 g）含量最高。结果表明存在显着差异（p HPLC-MS测定的RB和IDF之间的酚酸组成小于<.05），IDF中的总酚酸较高。在DPPH，FRAP，ABTS和还原能力测定中，IDF的抗氧化能力高于RB。但是，IDF的体外酚类和类黄酮生物可及性较低，因为其结合酚类和类黄酮的含量很高。