Publication date: Available online 4 May 2017
Source:Bioactive Carbohydrates and Dietary Fibre
Author(s): Lovemore Nkhata Malunga, Marta Izydorczyk, Trust Beta
Dietary lipid hydroperoxides (LOOH) are implicated in the rise of colon cancers. We investigated the effect of water-extractable arabinoxylans (WEAX) on lipid peroxidation under simulated gastric conditions. Water-extractable fractions containing mostly arabinoxylans were isolated from wheat aleurone and wheat bran and fractionated by stepwise precipitation with (NH4)2SO4 at 50 and 75% saturation. LOOH concentration (121.2 ± 3.8µM/g) of grilled chicken breast muscle increased by 30%; however, it remained unaltered or decreased (≤35%) depending on type and concentration of WEAX fractions. Antioxidant capacity of WEAX fractions based on DPPH, ABTS and ORAC was 28.2 – 147.9, 91.2 – 355.3, and 185.9 – 527.5µM TE/g, respectively. The content of ferulic acid residues in WEAX fractions (R = 0.99) and relative proportions of monosubstituted xylose residues (R = 0.80) influenced the antioxidant capacity. Consumption of diets rich in feruloylated WEAX may offer protection against oxidative damage in the gastrointestinal tract.
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