【摘要】 讨论了以中空纤维为载体的碳纳米管/正辛醇固-液协同微萃取机理,建立了中空纤维碳纳米管/正辛醇固-液协同微萃取-高效液相色谱法同时测定复杂样品中微量咖啡酸、阿魏酸和肉桂酸含量的方法。以2.5cm长的聚偏氟乙烯中空纤维为碳纳米管正辛醇分散液载体,供相为分析物的HCl(pH 2.1)溶液,接受相为pH 12.7的NaOH溶液,在35℃下,搅拌萃取60min,萃取液进行高效液相色谱紫外检测。在优化的实验条件下,分析物的线性范围均在0.05～50!g/L,r>0.9990(n=5);检出限均为0.015!g/L;日内与日间精密度均小于9.8%(n=9),平均回收率为93.8%～115.2%;富集倍数分别为514,942和1084倍。在以中空纤维为支持体的碳纳米管/正辛醇微萃取中,碳纳米管/正辛醇分散液嵌入中空纤维管壁上的微孔中形成了碳纳米管/正辛醇固-液微萃取单元束,对苯丙烯酸类化合物起到协同萃取作用。更多还原

【Abstract】 The mechanism of hollow fiber carbon nanotubes(CNTs)/octanol solid-liquid synergistic microextraction was investigated.A novel method was developed for the separation and determination of three cinnamic acid derivatives,coffee acid,ferulic acid and cinnamon acid,in pollen,honey and coffee by the solid-liquid synergistic microextraction combined with high performance liquid chromatography.The optimal experimental conditions were as follows: a 2.5-cm polyvinylidene fluoride hollow fiber was used as the carrier of the dispersed solution consisting of CNTs and n-octanol;the donor was HCl solu