Synthesis of an Ammonium Ionophore and Its Application in a Planar Ion-Selective Electrode
作者:John S. Benco、Hubert A. Nienaber、W. Grant McGimpsey
DOI:10.1021/ac0257851
日期:2003.1.1
and possessed high selectivity for ammonium ion over lithium and the divalent cations, calcium and magnesium (log K(POT)NH4+(j) = -7.3, -4.4, and -7.1 for lithium, calcium, and magnesium ions, respectively). The same membrane also exhibited sodium and potassium selectivity that was comparable to that reported for nonactin (log K(POT)NH4+(j) = -2.1 and -0.6 for sodium and potassium, respectively, compared
模块化技术用于基于环状二肽结构合成铵选择性离子载体。将离子载体并入平面离子选择电极传感器格式中,并在商业临床诊断“即时护理”仪器中测试了相对于一系列金属阳离子的选择性。测试了四种传感器膜配方,全部由增塑的PVC组成。关于所用增塑剂的类型以及是否存在离子添加剂,配方有所不同。发现含有极性增塑剂硝基苯基辛醚的膜在没有离子添加剂的情况下表现出近能斯特行为(斜率,在37摄氏度下为60.1 mV /十倍),并且对铵离子的选择性高于锂和二价阳离子,钙和镁(log K(POT)NH4 +(j)= -7.3,-4.4,和-7.1分别表示锂,钙和镁离子)。同一膜对钠和钾的选择性也与非肌动蛋白报道的相当(log K(POT)NH4 +(j)对钠和钾分别为-2.1和-0.6,而在这种情况下为-2.4和-0.9非肌动蛋白)。包含极性较小的增塑剂邻苯二甲酸二辛酯的膜表现出亚能斯特行为(斜率,在37摄氏度下<50 mV