苹婆种子营养及抗氧化活性

介绍了一种原产华南、种子可食的木本植物——苹婆的生物学特性,并以广西苹婆（Sterculia nobilisSmith）种子为材料,对其营养成分进行了测定。通过测定其多酚提取物的还原力和金属螯合力,以及对1,1-二苯基-2-三硝基苯肼（DPHH）自由基、羟自由基和超氧阴离子自由基的清除能力,探讨了苹婆种子的抗氧化活性。结果显示：苹婆种子营养丰富,含有18种氨基酸,富含酚类物质。其中,淀粉含量60.42 g/100 g FW、蛋白质20.32 g/100 g FW、脂肪2.18 g/100 g FW、氨基酸2.36 g/100 g FW、铁136.86 mg/g FW、维生素C 7225μg/100 g FW;总酚含量为401.84μg/mL没食子酸。苹婆种子多酚提取物有较强的还原力,金属螯合力,以及DPPH自由基、羟自由基和超氧阴离子自由基清除能力,在0～50μg/mL浓度范围,苹婆抗氧化能力与抗坏血酸或乙二胺四乙酸（EDTA）相当。苹婆种子营养全面,具有较强的抗氧化能力,苹婆是很有潜力的功能食品来源植物。

Study on Nutrition and Antioxidant Activities of Sterculia nobilis Smith Seeds

Biological characters of Sterculia nobilis Smith were briefly introduced as a native woody plant with edible seeds in South China. Nutritional compositions of the seeds from Guangxi were measured. The antioxidant activities were determined by evaluating reducing power, metal chelating capacity, 1,1-diphenyl-2-picrylhydrazyl （DPPH） radical-scavenging activity, hydroxyl radical-scavenging activity,and superoxide anion-scavenging activity of poly- phenols extraction from the seeds. The results showed that S. nobilis Smith seeds were nutri- tious,contained eighteen amino acids and abundant polyphenols. The content of starch was 60.42 g/100 g F-W, protein was 20.32 g/100 g FW, fat was 2. 18 g/100 g FW, amino acids were 2.36 g/100 g FW, Fe was 136.86 mg/100 g FW, vitamin C was 7225 mg/100 g FW, and total phenols were 401.84 pg/mL gallic acid. Polyphenols extraction of S. nobilis Smith seeds expressed rather strong reducing power, metal chelating capacity, DPPH radical-scavenging activity,hydroxyl radical-scavenging activity and superoxide anion-scavenging activity. In the content range of 0-50 μg/mL gallic acid, S. nobilis Smith seeds expressed nearly the same antioxidant activity to that of ascorbic acid and EDTA. Thus, S. nobilis is a potential functional food resource plant due to its comprehensive nutrition and high antioxidant activities.