Wheat bran itself has three distinct layers. The pericarp has both outer and inner layers consisting of insoluble fiber and bound phenolic acids. The hyaline or embryo sac is the intermediate layer of the bran. It covers the aleurone layer, which contains a rich supply of lignans and proteins, amino acids, bioactive compounds, antioxidants, vitamins, and minerals. Wheat bran also contains minerals such as iron, magnesium, manganese, and phosphorus.
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