College of Health Sciences, University of Brasilia, Brasilia, DF, Brazil.
J Sci Food Agric. 2012 Mar 15;92(4):831-8. doi: 10.1002/jsfa.4654. Epub 2011 Oct 12.
Strawberries are nutritive fruits and a source of antioxidants. We evaluated antioxidant properties of 'Camino Real' strawberries grown in the Brazilian savannah, harvested in different seasons. Analytical and meteorological data were analyzed by partial least squares regression.
Fruits from May showed the lowest contents of total phenolics (1789.78 mg kg⁻¹ fresh weight (FW)), catechin (21.37 mg kg⁻¹ FW), quercetins (4.89 mg kg⁻¹ FW) and total ellagic acid (208.68 mg kg⁻¹ FW) and the lowest antioxidant activity by 2,2-diphenyl-1-picrylhydrazyl (DPPH) (11.39 mg Butylated hydroxytoluene (BHT) eq. g⁻¹ FW) and ferric reducing antioxidant power (FRAP) (22.01 mg ferrous sulfate eq. g⁻¹ FW) assays. Strawberries harvested in July presented the lowest concentrations of total (190.61 mg kg⁻¹ FW) and individual anthocyanins (73.88 mg kg⁻¹ FW and 5.96 mg kg⁻¹ FW for pelargonidin-3-glucoside and cyanidin-3-glucoside, respectively), but the highest contents of vitamin C (685.47 mg kg⁻¹ FW), DPPH (18.87 mg BHT eq. g⁻¹ FW) and FRAP (39.30 mg ferrous sulfate eq. g⁻¹ FW). The highest contents of free ellagic acid (26.11 mg kg⁻¹ FW), pelargonidin-3-glucoside (291.82 mg kg⁻¹ FW) and cyanidin-3-glucoside (11.84 mg kg⁻¹ FW) were found in strawberries from September. Rain in the previous 30 days to harvest influenced negatively many phenolics and antioxidant activity of strawberries harvested in May. In July, longer photoperiod and lower temperature at 30 days previous to harvest probably led to higher antioxidant activity and vitamin C. Increased photoperiod and temperature at the final stage of maturation seem to raise pigments and free ellagic acid in strawberries.
It was possible to observe significant relationships among meteorological and antioxidant variables for strawberries grown in the Brazilian savannah.
草莓是营养丰富的水果，也是抗氧化剂的来源。我们评估了在巴西大草原种植的“卡米诺雷亚尔”草莓的抗氧化特性，这些草莓在不同季节收获。通过偏最小二乘回归分析对分析和气象数据进行了分析。
5 月份收获的草莓总酚（1789.78 mg kg⁻¹鲜重（FW））、儿茶素（21.37 mg kg⁻¹ FW）、槲皮素（4.89 mg kg⁻¹ FW）和总鞣花酸（208.68 mg kg⁻¹ FW）含量最低，2,2-二苯基-1-苦基肼（DPPH）（11.39 mg 叔丁基对羟基甲苯（BHT）当量。g⁻¹ FW）和铁还原抗氧化能力（FRAP）（22.01 mg 硫酸亚铁当量。g⁻¹ FW）测定的抗氧化活性最低。7 月份收获的草莓总（190.61 mg kg⁻¹ FW）和个体花青素（分别为 73.88 mg kg⁻¹ FW 和 5.96 mg kg⁻¹ FW 对矢车菊素-3-葡萄糖苷和飞燕草素-3-葡萄糖苷）浓度最低，但维生素 C（685.47 mg kg⁻¹ FW）、DPPH（18.87 mg BHT 当量。g⁻¹ FW）和 FRAP（39.30 mg 硫酸亚铁当量。g⁻¹ FW）含量最高。9 月份收获的草莓中游离鞣花酸（26.11 mg kg⁻¹ FW）、矢车菊素-3-葡萄糖苷（291.82 mg kg⁻¹ FW）和飞燕草素-3-葡萄糖苷（11.84 mg kg⁻¹ FW）含量最高。前 30 天降雨对 5 月份收获的草莓中许多酚类物质和抗氧化活性有负面影响。在 7 月，较长的光照时间和收获前 30 天较低的温度可能导致更高的抗氧化活性和维生素 C。在成熟的最后阶段，光照时间和温度的增加似乎会提高草莓中的色素和游离鞣花酸。
可以观察到在巴西大草原种植的草莓的气象和抗氧化变量之间存在显著关系。
