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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Continuous Hot Pressurized Solvent Extraction of 1,1-Diphenyl-2-picrylhydrazyl Free Radical Scavenging Compounds from Taiwan Yams (Dioscorea alata)
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Continuous Hot Pressurized Solvent Extraction of 1,1-Diphenyl-2-picrylhydrazyl Free Radical Scavenging Compounds from Taiwan Yams (Dioscorea alata)

机译：台湾山药（Dioscorea alata）1,1-二苯基-2-吡啶并肼基自由基清除化合物的连续热压萃取

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摘要

This study investigates a semicontinuous hot pressurized fluid extraction process and the scavenging activity on the 1,1-diphenyl-2-picrylhydrazyl (DPPH)free radical of the extract from Taiwan yams (Dioscorea alata).Liquid-liquid extractions were preliminarily employed to generate six fractions,initially extracted by ethanol.Then,the aqueous solution of dried crude ethanol extract was sequentially fractionated by hexane,chloroform,ethyl acetate,and n-butanol.The EC_(50)value was defined as the UV absorption of DPPH concentrations sufficiently decreased to 50% of the original value.It was found that all peel portions have a better effect on scavenging of the DPPH free radical than meat portions,especially for the ethyl acetate partition of the peel portion of Tainung #2 yam.Its EC_(50)value (14.5 mug mL~(-1))was even lower than that of ascorbic acid (21.4 mug mL~(-1)).Furthermore,semicontinuous hot pressurized ethanol was superior to hot pressurized water in extracting the compound scavenging the DPPH radical from the Purpurea-Roxb peel.The recovery of four unknown compounds corresponded to the scavenging ratio of DPPH free radical in the hot pressurized ethanol extract.Finally,three-level and four-factor experimental design revealed that ethanol ratio and temperature were the most effective factors in order.Conditions of 80% of aqueous ethanol,20.0 kg/kg solid ratio,180 psig (1.342 MPa),and 100 deg C were preferred to extract those antioxidants from the yam peel.
机译：本研究探讨了台湾山药（Dioscorea alata）提取物的半连续热加压流体提取工艺及其对1,1-二苯基-2-吡啶并二肼（DPPH）自由基的清除活性。先用乙醇提取六部分，然后依次用己烷，氯仿，乙酸乙酯和正丁醇分馏干燥的粗乙醇提取物的水溶液。EC_（50）值定义为DPPH浓度对UV的充分吸收降低至原始值的50％，发现所有果皮部分对DPPH自由基的清除效果均优于肉类部分，尤其是台南2号山药皮果皮部分的乙酸乙酯分配。 50）值（14.5杯mL〜（-1））甚至比抗坏血酸（21.4杯mL〜（-1））还要低。此外，半连续热加压乙醇在提取化合物渣中的性能优于热加压水。紫杉醇皮中的DPPH自由基的形成。四种未知化合物的回收率与热加压乙醇提取物中DPPH自由基的清除率相对应。最后，通过三级四因素实验设计，揭示了乙醇的比例和温度。顺序是最有效的因素。从山药果皮中提取这些抗氧化剂时，优选使用80％的乙醇水溶液，20.0 kg / kg的固体比，180 psig（1.342 MPa）和100℃的条件。

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