The fruit of Manilkara hexandra(Roxb.)Dubard is one of the most underutilized fruits of India and in Gujarat state.It is popularly known as‘Rayan’.The fruit and seed of Rayan were analysed for their total phenolic a...The fruit of Manilkara hexandra(Roxb.)Dubard is one of the most underutilized fruits of India and in Gujarat state.It is popularly known as‘Rayan’.The fruit and seed of Rayan were analysed for their total phenolic and flavonoid content,phenolic compounds and total antioxidant capacity with six different assay methods.The results indicated that the methanolic extract of Rayan fruit being a good source of phenolic(811.3 mg GAE/100 g fw)and flavonoid(485.56 mg RE/100 g fw)content.Also,eleven known phenolic compounds were tentatively identified for the first time from the fruit and seed of Rayan.The LC–MS/MS analysis of fruit revealed the presence of major phenolic compounds such as gallic acid,quercetin and kaempferol,while quercetin,gallic acid and vanillic acid in seed.The presence of quercetin suggests health benefits.The fruit of Rayan was also proved to be a better source of antioxidants as measured by FRAP,RPA,DPPHRSA,ABTSRSA and HRSA except NORSA in comparison with that of seed.The current study explains that M.hexandra is a relatively good source of antioxidants such as phenols and flavonoids for diet.展开更多
鉴于目前市面上果醋产品同质化相对严重,本文以菠萝和苦荞为原料,通过红茶菌发酵开发一种新型红茶菌菠萝苦荞果醋,对其发酵过程中基本理化指标(微生物活菌数、pH、总酸、维生素C)和抗氧化活性进行测定分析。结果表明红茶菌菠萝苦荞果醋...鉴于目前市面上果醋产品同质化相对严重,本文以菠萝和苦荞为原料,通过红茶菌发酵开发一种新型红茶菌菠萝苦荞果醋,对其发酵过程中基本理化指标(微生物活菌数、pH、总酸、维生素C)和抗氧化活性进行测定分析。结果表明红茶菌菠萝苦荞果醋的最佳发酵工艺下果醋中醋酸菌、酵母菌及乳酸菌总活菌数为137.5×10^(3)CFU·mL^(-1),pH为2.75,总酸含量为4.52 g CH_(3)COOH/L,维生素C浓度为0.17 mg·mL^(-1),DPPH自由基和羟基自由基清除率分别为97.22%和55.51%。综合表明红茶菌菠萝苦荞果醋具有风味独特、维生素C含量丰富以及抗氧化活性强的特点,是一种适于大众的健康饮品。展开更多
采用铁离子还原/抗氧化力测定法(ferric reducing/antioxidant power assay,FRAP)、邻苯三酚法、水杨酸法,比较猕猴桃、龙眼、蓝莓、大枣、南瓜、冬瓜、菠菜、芹菜、苦瓜、木耳10种果蔬提取物的总抗氧化力、清除超氧阴离子(O2-.)及清除...采用铁离子还原/抗氧化力测定法(ferric reducing/antioxidant power assay,FRAP)、邻苯三酚法、水杨酸法,比较猕猴桃、龙眼、蓝莓、大枣、南瓜、冬瓜、菠菜、芹菜、苦瓜、木耳10种果蔬提取物的总抗氧化力、清除超氧阴离子(O2-.)及清除羟自由基(.OH)能力。结果显示,上述10种果蔬提取物的总抗氧化力按由强到弱的排序依次为:蓝莓>大枣>龙眼>南瓜>苦瓜>木耳>猕猴桃>芹菜>菠菜>冬瓜;清除超氧阴离子(O2-.)的能力依次为:龙眼>南瓜>菠菜>蓝莓>大枣>芹菜>冬瓜>苦瓜>木耳>猕猴桃;清除羟自由基(.OH)的能力依次为:猕猴桃>蓝莓>芹菜>菠菜>木耳>大枣>龙眼>冬瓜>苦瓜>南瓜。展开更多
文摘The fruit of Manilkara hexandra(Roxb.)Dubard is one of the most underutilized fruits of India and in Gujarat state.It is popularly known as‘Rayan’.The fruit and seed of Rayan were analysed for their total phenolic and flavonoid content,phenolic compounds and total antioxidant capacity with six different assay methods.The results indicated that the methanolic extract of Rayan fruit being a good source of phenolic(811.3 mg GAE/100 g fw)and flavonoid(485.56 mg RE/100 g fw)content.Also,eleven known phenolic compounds were tentatively identified for the first time from the fruit and seed of Rayan.The LC–MS/MS analysis of fruit revealed the presence of major phenolic compounds such as gallic acid,quercetin and kaempferol,while quercetin,gallic acid and vanillic acid in seed.The presence of quercetin suggests health benefits.The fruit of Rayan was also proved to be a better source of antioxidants as measured by FRAP,RPA,DPPHRSA,ABTSRSA and HRSA except NORSA in comparison with that of seed.The current study explains that M.hexandra is a relatively good source of antioxidants such as phenols and flavonoids for diet.
文摘鉴于目前市面上果醋产品同质化相对严重,本文以菠萝和苦荞为原料,通过红茶菌发酵开发一种新型红茶菌菠萝苦荞果醋,对其发酵过程中基本理化指标(微生物活菌数、pH、总酸、维生素C)和抗氧化活性进行测定分析。结果表明红茶菌菠萝苦荞果醋的最佳发酵工艺下果醋中醋酸菌、酵母菌及乳酸菌总活菌数为137.5×10^(3)CFU·mL^(-1),pH为2.75,总酸含量为4.52 g CH_(3)COOH/L,维生素C浓度为0.17 mg·mL^(-1),DPPH自由基和羟基自由基清除率分别为97.22%和55.51%。综合表明红茶菌菠萝苦荞果醋具有风味独特、维生素C含量丰富以及抗氧化活性强的特点,是一种适于大众的健康饮品。
文摘采用铁离子还原/抗氧化力测定法(ferric reducing/antioxidant power assay,FRAP)、邻苯三酚法、水杨酸法,比较猕猴桃、龙眼、蓝莓、大枣、南瓜、冬瓜、菠菜、芹菜、苦瓜、木耳10种果蔬提取物的总抗氧化力、清除超氧阴离子(O2-.)及清除羟自由基(.OH)能力。结果显示,上述10种果蔬提取物的总抗氧化力按由强到弱的排序依次为:蓝莓>大枣>龙眼>南瓜>苦瓜>木耳>猕猴桃>芹菜>菠菜>冬瓜;清除超氧阴离子(O2-.)的能力依次为:龙眼>南瓜>菠菜>蓝莓>大枣>芹菜>冬瓜>苦瓜>木耳>猕猴桃;清除羟自由基(.OH)的能力依次为:猕猴桃>蓝莓>芹菜>菠菜>木耳>大枣>龙眼>冬瓜>苦瓜>南瓜。
