Bellido Guillermo G, Beta Trust
Department of Food Science, University of Manitoba, Winnipeg, Manitoba, Canada.
J Agric Food Chem. 2009 Feb 11;57(3):1022-8. doi: 10.1021/jf802846x.
The importance of anthocyanins to the total antioxidant capacity of various fruits and vegetables has been well established, but less attention has been focused on cereal grains. This study investigated the antioxidant capacity and anthocyanin composition of a bran-rich pearling fraction (10% outer kernel layers) and whole kernel flour of purple (CI-1248), black (PERU-35), and yellow (EX-83) barley genotypes. HPLC analysis showed that as much as 6 times more anthocyanin per unit weight (microg/g) was present in the bran-rich fractions of yellow and purple barley (1587 and 3534, respectively) than in their corresponding whole kernel flours (210 and 573, respectively). Delphinidin 3-glucoside, delphinidin 3-rutinoside, cyanidin 3-glucoside, petunidin 3-glucoside, and cyanidin chloride were positively identified in barley, with as many as 9 and 15 anthocyanins being detected in yellow and purple barley, respectively. Antioxidant activity analysis showed that the ORAC values for the bran-rich fractions were significantly (p < 0.05) higher than for the whole kernel flour.
花色苷对各种水果和蔬菜总抗氧化能力的重要性已得到充分证实，但对谷物的关注较少。本研究调查了紫色（CI - 1248）、黑色（PERU - 35）和黄色（EX - 83）大麦基因型的富麸皮磨片（外胚层10%）和全粒面粉的抗氧化能力及花色苷组成。高效液相色谱分析表明，黄色和紫色大麦的富麸皮部分（每单位重量分别为1587和3534微克/克）中的花色苷含量比其相应的全粒面粉（分别为210和573微克/克）高出多达6倍。在大麦中已明确鉴定出矢车菊素3 - 葡萄糖苷、矢车菊素3 - 芸香糖苷、花青素3 - 葡萄糖苷、矮牵牛素3 - 葡萄糖苷和氯化花青素，黄色和紫色大麦中分别检测到多达9种和15种花色素苷。抗氧化活性分析表明，富麸皮部分的氧自由基吸收能力（ORAC）值显著高于全粒面粉（p < 0.05）。
