Wu Gangcheng, Johnson Stuart K, Bornman Janet F, Bennett Sarita J, Clarke Michael W, Singh Vijaya, Fang Zhongxiang
Food Science and Technology Program, School of Public Health, Curtin University, Perth, WA 6845, Australia.
International Institute of Agri-Food Security (IIAFS), Curtin University, PO Box U1987, Perth, WA 6845, Australia.
Sci Rep. 2016 Feb 24;6:21835. doi: 10.1038/srep21835.
Polyphenols in sorghum grains are a source of dietary antioxidants. Polyphenols in six diverse sorghum genotypes grown under two day/night temperature regimes of optimal temperature (OT, 32/21 °C and high temperature (HT, 38/21 °C) were investigated. A total of 23 phenolic compounds were positively or tentatively identified by HPLC-DAD-ESIMS. Compared with other pigmented types, the phenolic profile of white sorghum PI563516 was simpler, since fewer polyphenols were detected. Brown sorghum IS 8525 had the highest levels of caffeic and ferulic acid, but apigenin and luteolin were not detected. Free luteolinidin and apigeninidin levels were lower under HT than OT across all genotypes (p ≤ 0.05), suggesting HT could have inhibited 3-deoxyanthocyanidins formation. These results provide new information on the effects of HT on specific polyphenols in various Australian sorghum genotypes, which might be used as a guide to grow high antioxidant sorghum grains under projected high temperature in the future.
高粱籽粒中的多酚是膳食抗氧化剂的一个来源。对在两种昼夜温度条件下（最佳温度（OT，32/21°C）和高温（HT，38/21°C））种植的六种不同高粱基因型中的多酚进行了研究。通过HPLC-DAD-ESIMS共明确鉴定或初步鉴定出23种酚类化合物。与其他有色类型相比，白色高粱PI563516的酚类谱更为简单，因为检测到的多酚较少。棕色高粱IS 8525的咖啡酸和阿魏酸含量最高，但未检测到芹菜素和木犀草素。在所有基因型中，高温条件下的游离木犀草素定和芹菜素定水平均低于最佳温度条件下（p≤0.05），这表明高温可能抑制了3-脱氧花青素的形成。这些结果提供了关于高温对澳大利亚各种高粱基因型中特定多酚影响的新信息，这可能作为未来在预计高温条件下种植高抗氧化高粱籽粒的指导。
