This study investigated the extraction of 5'-phosphodiesterase from malt root and the degradation of nucleic acids by this enzyme. The extraction used grade precipitation with ammonium sulfate and enzymatic hydrolysi...This study investigated the extraction of 5'-phosphodiesterase from malt root and the degradation of nucleic acids by this enzyme. The extraction used grade precipitation with ammonium sulfate and enzymatic hydrolysis. Samples were assayed using the modified Bradford method and high performance liquid chromatography. The results show that 5'-phosphodiesterase is isolated by grade precipitation with 30% and 80% saturation of ammonium sulfate and can be utilized to degrade deoxyribonucleic acid. The hydrolysate has four kinds of deoxynucleotides: 5'-dCMP, 5'-dTMP, 5'-dAMP, and 5'-dGMP. The optimum reaction temperature is 70℃, and the optimum pH is 5.5-6.0 for the reaction. The percentage of deoxynucleotides indicated by the China Pharmacopoeia (2000 edition) in the product is over 70%. The extraction of 5'-phosphodiesterase from malt root is shown to be possible and economical. Products from the enzYmatic hydrolysate of DNA meet the pharmacopoeia.展开更多
为深入研究大麦芽根蛋白的组成及功能特性,以麦芽根蛋白提取物为原料,采用Osborne法对其进行了分级纯化,采用SDS-PAGE电泳分析了蛋白亚基分布及其相对分子质量,考察了蛋白浓度、p H值、温度、Na Cl浓度等因素对其溶解性、持水性的影响...为深入研究大麦芽根蛋白的组成及功能特性,以麦芽根蛋白提取物为原料,采用Osborne法对其进行了分级纯化,采用SDS-PAGE电泳分析了蛋白亚基分布及其相对分子质量,考察了蛋白浓度、p H值、温度、Na Cl浓度等因素对其溶解性、持水性的影响。结果表明,大麦芽根蛋白中清蛋白、球蛋白、醇溶蛋白和谷蛋白分别占总蛋白的45.79%、17.46%、5.69%、11.47%;蛋白亚基分子量主要集中在30~40 k Da范围内,另两个谱带的分子量分别为24 k Da、56 k Da;在一定条件下,蛋白提取物具有较好的溶解性、持水性。研究结果为大麦芽根蛋白在食品中的应用提供了一定的依据。展开更多
基金the Key Technologies Research & Development Pro-gram of Zhejiang Province (No. 2005C22053)
文摘This study investigated the extraction of 5'-phosphodiesterase from malt root and the degradation of nucleic acids by this enzyme. The extraction used grade precipitation with ammonium sulfate and enzymatic hydrolysis. Samples were assayed using the modified Bradford method and high performance liquid chromatography. The results show that 5'-phosphodiesterase is isolated by grade precipitation with 30% and 80% saturation of ammonium sulfate and can be utilized to degrade deoxyribonucleic acid. The hydrolysate has four kinds of deoxynucleotides: 5'-dCMP, 5'-dTMP, 5'-dAMP, and 5'-dGMP. The optimum reaction temperature is 70℃, and the optimum pH is 5.5-6.0 for the reaction. The percentage of deoxynucleotides indicated by the China Pharmacopoeia (2000 edition) in the product is over 70%. The extraction of 5'-phosphodiesterase from malt root is shown to be possible and economical. Products from the enzYmatic hydrolysate of DNA meet the pharmacopoeia.
文摘为深入研究大麦芽根蛋白的组成及功能特性,以麦芽根蛋白提取物为原料,采用Osborne法对其进行了分级纯化,采用SDS-PAGE电泳分析了蛋白亚基分布及其相对分子质量,考察了蛋白浓度、p H值、温度、Na Cl浓度等因素对其溶解性、持水性的影响。结果表明,大麦芽根蛋白中清蛋白、球蛋白、醇溶蛋白和谷蛋白分别占总蛋白的45.79%、17.46%、5.69%、11.47%;蛋白亚基分子量主要集中在30~40 k Da范围内,另两个谱带的分子量分别为24 k Da、56 k Da;在一定条件下,蛋白提取物具有较好的溶解性、持水性。研究结果为大麦芽根蛋白在食品中的应用提供了一定的依据。