[Objectives] To study on colorimetric method and content determination of total phenol in homemade plum wine. [Methods]The optimal determination condition of total polyphenols content in plum wine( commercially availa...[Objectives] To study on colorimetric method and content determination of total phenol in homemade plum wine. [Methods]The optimal determination condition of total polyphenols content in plum wine( commercially available and homemade) by Folin-Ciocalteu method was inspected,and commercially available and homemade plum wine was evaluated by the method. [Results]The optimal determination conditions of total polyphenols content: sample dose of 1. 0 m L,Folin-Ciocalteu reagent of 1 m L,4% Na_2CO_3 solution of 4. 0 m L,reaction temperature of 50 ℃,reaction time of 1. 5 h,and determination wavelength of 756 nm. Absorbance showed good linear relationship with total polyphenols content within the range of 17. 73-59. 12 μg/m L( y = 14. 878 x + 0. 0739,R^2= 0. 9998). Recovery rate of adding standard sample was between 98. 8% and 103. 5%,and relative standard deviation was 2. 0%( n = 5). [Conclusions]The method had high precision degree and good stability,which was suitable for measuring total polyphenols content in plum wine( commercially available and homemade).展开更多
本研究采用福林酚法测定樱桃酒中总酚的含量,并通过响应面法优化其工艺参数。在单因素实验基础上,以福林酚试剂用量、碳酸钠浓度、显色温度、显色时间和碳酸钠用量为影响因素,樱桃酒总酚含量为指标,响应面法进行分析和优化。结果表明,...本研究采用福林酚法测定樱桃酒中总酚的含量,并通过响应面法优化其工艺参数。在单因素实验基础上,以福林酚试剂用量、碳酸钠浓度、显色温度、显色时间和碳酸钠用量为影响因素,樱桃酒总酚含量为指标,响应面法进行分析和优化。结果表明,优化后得到最佳条件为:福林酚试剂2.1 m L、碳酸钠浓度63 g/L、碳酸钠用量8.32 m L,在25℃件下反应1.4 h,总酚含量为1085.2±0.16 mg/L。此回归模型拟合性良好,可用于预测总酚含量。根据此线性回归方程测定12个品种樱桃酒中总酚含量最高的为俄罗斯酸樱桃(1495.0 mg/L),雷尼含量最低(442.8 mg/L)。福林酚法操作简单,可用于不同品种樱桃酒总酚含量的测定。展开更多
目的研究大孔树脂静态吸附香椿子多酚的热力学与动力学特征。方法福林酚法测定香椿子多酚含有量,考察大孔树脂(DM130、AB-8、HPD400、HPD450、HPD-826)的吸附效果,绘制等温线、动力学的静态吸附曲线。结果HPD400大孔树脂的吸附符合Freun...目的研究大孔树脂静态吸附香椿子多酚的热力学与动力学特征。方法福林酚法测定香椿子多酚含有量,考察大孔树脂(DM130、AB-8、HPD400、HPD450、HPD-826)的吸附效果,绘制等温线、动力学的静态吸附曲线。结果HPD400大孔树脂的吸附符合Freundlich、Langmuir方程,为吸热、熵增、可逆和自发进行的吸附,可用准二级动力学方程表示吸附动力学规律,其主要速控步骤为液膜扩散,吸附活化能为0.937 k J/mol。结论 HPD400大孔树脂对香椿子多酚有较好的吸附性能。展开更多
基金Supported by Sichuan Science and Technology Support Plan(2015FZ0026)Postgraduate Innovation Project of Southwest University for Nationalities(CX2016SZ016)
文摘[Objectives] To study on colorimetric method and content determination of total phenol in homemade plum wine. [Methods]The optimal determination condition of total polyphenols content in plum wine( commercially available and homemade) by Folin-Ciocalteu method was inspected,and commercially available and homemade plum wine was evaluated by the method. [Results]The optimal determination conditions of total polyphenols content: sample dose of 1. 0 m L,Folin-Ciocalteu reagent of 1 m L,4% Na_2CO_3 solution of 4. 0 m L,reaction temperature of 50 ℃,reaction time of 1. 5 h,and determination wavelength of 756 nm. Absorbance showed good linear relationship with total polyphenols content within the range of 17. 73-59. 12 μg/m L( y = 14. 878 x + 0. 0739,R^2= 0. 9998). Recovery rate of adding standard sample was between 98. 8% and 103. 5%,and relative standard deviation was 2. 0%( n = 5). [Conclusions]The method had high precision degree and good stability,which was suitable for measuring total polyphenols content in plum wine( commercially available and homemade).
文摘本研究采用福林酚法测定樱桃酒中总酚的含量,并通过响应面法优化其工艺参数。在单因素实验基础上,以福林酚试剂用量、碳酸钠浓度、显色温度、显色时间和碳酸钠用量为影响因素,樱桃酒总酚含量为指标,响应面法进行分析和优化。结果表明,优化后得到最佳条件为:福林酚试剂2.1 m L、碳酸钠浓度63 g/L、碳酸钠用量8.32 m L,在25℃件下反应1.4 h,总酚含量为1085.2±0.16 mg/L。此回归模型拟合性良好,可用于预测总酚含量。根据此线性回归方程测定12个品种樱桃酒中总酚含量最高的为俄罗斯酸樱桃(1495.0 mg/L),雷尼含量最低(442.8 mg/L)。福林酚法操作简单,可用于不同品种樱桃酒总酚含量的测定。
文摘目的研究大孔树脂静态吸附香椿子多酚的热力学与动力学特征。方法福林酚法测定香椿子多酚含有量,考察大孔树脂(DM130、AB-8、HPD400、HPD450、HPD-826)的吸附效果,绘制等温线、动力学的静态吸附曲线。结果HPD400大孔树脂的吸附符合Freundlich、Langmuir方程,为吸热、熵增、可逆和自发进行的吸附,可用准二级动力学方程表示吸附动力学规律,其主要速控步骤为液膜扩散,吸附活化能为0.937 k J/mol。结论 HPD400大孔树脂对香椿子多酚有较好的吸附性能。
