Antioxidant properties of bran extracts from ';Platte'; wheat grown at different locations

作者：Yu LL^*; Zhou KQ

来源：Food Chemistry, 2005, 90(1-2): 311-316.

DOI：10.1016/j.foodchem.2004.04.007

• wheat
• radical scavenging
• antioxidant
• phenolic
• chelating
• ABTS(center dot+)
• DPPH center dot

The effects of environmental factors including total solar radiation, average daily solar radiation, and number of hours exceeding 32 degreesC on the antioxidant properties and total phenolic contents (TPC) of Platte wheat were evaluated. Bran extracts of Platte wheat grown at one irrigated and four nonirrigated testing locations in Colorado were examined for their radical scavenging activities against ABTS(+) and DPPH, Fe2+ chelating capacity, and TPC. Bran samples from Fort Collins, the irrigated location, had the greatest ABTS(+) scavenging activity of 35.8 mumole trolox equivalent/g bran, and the strongest DPPH scavenging capacity. Differences in chelating activities and TPC were also detected among bran samples from individual growing locations. Total phenolic contents of Platte bran grown at five different locations were correlated with the number of hours exceeding 32 degreesC (r = -0.86, P = 0.06). No correlation between solar radiations and any of the tested antioxidant properties was detected in this study. These data indicated the potential influence of growing conditions on the antioxidant properties and TPC of wheat. Furthermore, individual antioxidant property of a selected wheat genotype may respond to the environmental changes differently.

• 出版日期2005-4