The structure of bupirimate was identified by using MS and NMR.The structures of 10 impurities were identified by using GC-MS.The method provides a powerful tool for structure analysis special in complex samples.
The structure of coenzyme Q10 sample was identified by MS,IR and NMR.And the impurities were identified by HPLC-ESI MS.The unknown impurities were coenzyme Q10’s structure isomeride,Q9,Q11
Adsorptive voltammetric behavior of resveratrol at a silver electrode was investigated. And based on this, a linear scan voltammetry for determination of resveratrol had been found. The adsorption corresponded to the ...Adsorptive voltammetric behavior of resveratrol at a silver electrode was investigated. And based on this, a linear scan voltammetry for determination of resveratrol had been found. The adsorption corresponded to the Langmuir type isotherm curve, and the free energy of adsorption was caculated to be -46.21 kJ/mol at 298 K. The electrochemical parameters such as charge transfer coefficient α and standard electron transfer rate constant ks were estimated. In 0.2 mol/L KNO3+1.2×10 -4 mol/L KCl solution, resveratrol can give a sensitive anode peak at potential about 0.29 V（vs. SCE）. The linear range between the peak current and the concentration of resveratrol is 2.0×10 -9 to 1.0×10 -8 mol/L and 1.0×10 -8 to 9.0×10 -8 mol/L, respectively. The detection limit is 4.0×10 -10 mol/L. The method had been applied to the determination of resveratrol in wine.展开更多
文摘The structure of bupirimate was identified by using MS and NMR.The structures of 10 impurities were identified by using GC-MS.The method provides a powerful tool for structure analysis special in complex samples.
文摘The structure of coenzyme Q10 sample was identified by MS,IR and NMR.And the impurities were identified by HPLC-ESI MS.The unknown impurities were coenzyme Q10’s structure isomeride,Q9,Q11
文摘Adsorptive voltammetric behavior of resveratrol at a silver electrode was investigated. And based on this, a linear scan voltammetry for determination of resveratrol had been found. The adsorption corresponded to the Langmuir type isotherm curve, and the free energy of adsorption was caculated to be -46.21 kJ/mol at 298 K. The electrochemical parameters such as charge transfer coefficient α and standard electron transfer rate constant ks were estimated. In 0.2 mol/L KNO3+1.2×10 -4 mol/L KCl solution, resveratrol can give a sensitive anode peak at potential about 0.29 V（vs. SCE）. The linear range between the peak current and the concentration of resveratrol is 2.0×10 -9 to 1.0×10 -8 mol/L and 1.0×10 -8 to 9.0×10 -8 mol/L, respectively. The detection limit is 4.0×10 -10 mol/L. The method had been applied to the determination of resveratrol in wine.
