Effects of debranning on the distribution of pentosans and relationships to phenolic content and antioxidant activity of wheat pearling fractions

Water extractable pentosans - Quantification of ferulic acid using RP-HPLC, techno-rheological and antioxidant properties

Water extractable pentosans extracted from three varieties of oats were studied for structural analysis using ATR- FTIR, ferulic acid content using RP-HPLC, antioxidant activity by DPPH, reducing power, and metal chelating assays, and functional properties. The appearance of absorption band at 1720 cm^-1 in water extractable pentosans is assigned to the presence of aromatic esters as displayed from ATR-FTIR spectrum. All the samples exhibited non-newtonian behavior with viscosities following the order; SWEP > 20WEP > 90WEP. Bile acid binding capacity of water soluble pentosans varied significantly from 46.69 to 49.40%. RP-HPLC displayed that water extractable pentosans from SKO20 contained about 2 times higher FA (423.00 μg/100 g) compared to SWEP (250.00 μg/100 g) and 90 WEP (253.00 μg/100 g). Water soluble pentosans had DPPH scavenging activity, reducing power, and metal chelation activity in the range of 13.57-17.45 (μg α-tocopherol/g), 8.91-10.24 (μg BHT/g), and 0.55-0.76 (μg citric acid/g), respectively.

Consumption of wheat bran modified by autoclaving reduces fat mass in hamsters

PURPOSE

To investigate the effect that wheat bran modified by autoclaving (MWB) had on reducing fat accumulation in hamsters fed a hypercholesterolemia- and obesity-inducing diet.

METHODS

Male hamsters (n = 45) were randomized into 3 groups and fed a hypercholesterolemia- and obesity-inducing diet with or without 10% standard wheat bran or MWB for 28 days. Our outcome measures included body composition measured by DXA, oxygen consumption and plasma lipids and glucose concentrations.

RESULTS

Animals fed the MWB diet had lower % fat mass (49.8 vs. 53.4%; p = 0.02) and higher % lean body mass (47.2 vs. 44.1%; p = 0.02) compared with controls despite no differences in food intake or weight gain. Additionally, plasma glucose tended to be lower (6.9 vs. 8.5 mmol/l; p < 0.08) in the MWB animals compared with controls.

CONCLUSIONS

Our data suggest that the compositional changes in autoclaved wheat bran, specifically solubility of phenolic antioxidants and fiber, may have contributed to the lower fat accumulation in our animals. Further study is needed to determine whether the exact mechanism involved increased lipolysis and energy utilization from adipose.