摘要
研究了α-山竹黄酮和γ-山竹黄酮在玻璃碳电极上的电化学行为,研究了pH和静置时间等因素的影响,探讨了α-山竹黄酮和γ-山竹黄酮在玻璃碳电极上的氧化机理,建立了差分脉冲伏安法同时测定α-山竹黄酮和γ-山竹黄酮的方法。在pH 3.1的BR缓冲介质中,α-山竹黄酮在0.822 V产生灵敏的氧化峰,γ-山竹黄酮在0.426 V和0.700 V产生灵敏的氧化峰。对α-山竹黄酮,相应的氧化峰的峰高与浓度在5.00×10-6mol/L^2.00×10-4mol/L范围内呈良好的线性关系,线性相关系数为0.9950;对γ-山竹黄酮,其在0.426 V氧化峰的峰高与浓度在2.00×10-5mol/L^6.00×10-4mol/L浓度范围内呈良好的线性关系,线性相关系数为0.9904。该方法测量2.00×10-4mol/L的α-山竹黄酮和γ-山竹黄酮相对标准偏差分别为3.3%和4.1%(n=10)。
Electrochemical behavior of α-mangostin and γ-mangostin on a glassy carbon disk electrode was studied through investigation of the effect of pH,quit time etc.A novel differential pulse voltammetry（DPV） for the simultaneous determination of α-mangostin and γ-mangostin in the mixture was established.In Britton-Robinson buffer（pH 3.1）,α-mangostin and γ-mangostin can be oxidized on the electrode to produce oxidative peaks at the potentials of 0.822 V and 0.426 V（vs SCE） respectively.The corresponding peak currents are proportional to the concentration within 5.00×10-6mol/L～2.00×10-4mol/L for a-mangostin and within 2.00×10-5mol/L～6.00×10-4mol/L for γ-mangostin respectively. The linear correlation coefficients are 0.9950 and 0. 9904 for α-mangostin and γ-mangostin respectively. The RSDs are 3.3% and 4.1% （ n = 10） for 2.00×10-5mol/L a-mangostin and γ-mangostin separately.
出处
《分析试验室》
CAS
CSCD
北大核心
2010年第1期95-98,共4页
Chinese Journal of Analysis Laboratory
