Stoichiometric and kinetic studies of phenolic antioxidants from Andean purple corn and red-fleshed sweetpotato
Stoichiometric and kinetic studies of phenolic antioxidants from Andean purple corn and red-fleshed sweetpotato
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DOI：
10.1021/jf034109c
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发表时间：
2003-05-21
影响因子：
6.1
通讯作者：
Cisneros-Zevallos, L
中科院分区：
文献类型：
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作者：
Cevallos-Casals, BA;Cisneros-Zevallos, L
测定了安第斯紫玉米（Zea mays L.）红甘薯（Ipomoea batatas）这两种作物有较高的抗氧化能力和抗自由基动力学比蓝莓和较高或相似的花青素和酚类含量。红甘薯、Trolox、紫玉米和蓝莓的二级速率常数（k（2））分别为1.56、1.12、0.57和0.26（mg抗自由基/mL）（-1）s（-1）。在活性羟基的摩尔基础上，k（2）'显示出与k2相同的顺序。玉米芯和甘薯内皮层中酚类物质和抗氧化能力的贡献最大。研究的两种作物都可以被认为是功能性食品和膳食补充剂市场天然抗氧化剂的优良新来源。
Stoichiometric and kinetic values of phenolics against DPPH (2,2-diphenyl-1-picrylhydrazyl) were determined for Andean purple corn (Zea mays L.) and red sweetpotato (Ipomoea batatas). Both crops had higher antioxidant capacity and antiradical kinetics than blueberries and higher or similar anthocyanin and phenolic contents. The second-order rate constant (k(2)) was 1.56, 1.12, 0.57, and 0.26 (mg antiradical/mL)(-1) s(-1) for red sweetpotato, Trolox, purple corn, and blueberry, respectively. On the molar basis of active hydroxyl groups, k(2)' showed the same order as for k2. Corn cob and sweetpotato endodermis contributed the most in phenolic compounds and antioxidant capacity. Both crops studied can be considered as excellent novel sources of natural antioxidants for the functional food and dietary supplement markets.