Solvent polymeric membrane pH catheter electrode for intraluminal measurements in the upper gastrointestinal tract

Carrier-Based Ion-Selective Electrodes and Bulk Optodes. 2. Ionophores for Potentiometric and Optical Sensors

“…For very acidic conditions, such as for measurements in the gastrointestinal tract, ISEs based on octadecyl isonicotinate ( H + -7 (ETH 1778); log P TLC 15.3; log P TLC estimated as 9.8) 48 can be used, giving a dynamic range down to pH 0. However, the even smaller discrimination of interfering cations (log : K + , −4.4; Na + , −5.6; Li + , −6.9; microelectrode, KTpClPB, oNPOE) limits applications of these ISEs to pH < 4 . An electrode with the recently introduced ETH 2418 ( H + -8 ), a derivative of propyl red, seems to be a very useful alternative as it allows measurements in the dynamic range from pH < 1 to 10 with a much smaller loss in selectivity (log : K + , −7.4; Na + , −8.0; Mesamoll H81 (phenylalkylsulfonic acid esters), chloroparaffin 60C, KTpClPB) .…”

“…However, the even smaller discrimination of interfering cations (log K H,J pot : K + , -4.4; Na + , -5.6; Li + , -6.9; microelectrode, KTpClPB, oNPOE) limits applications of these ISEs to pH < 4. 74 An electrode with the recently introduced ETH 2418 (H + -8), a derivative of propyl red, seems to be a very useful alternative as it allows measurements in the dynamic range from pH < 1 to 10 with a much smaller loss in selectivity (log K H,J pot : K + , -7.4; Na + , -8.0; Mesamoll H81 (phenylalkylsulfonic acid esters), chloroparaffin 60C, KTpClPB). 75 the sedative midazolam, which is extracted into the electrode membrane as a neutral species and then seems to act as a second neutral carrier, could be eliminated by using either a silicone rubber membrane or the plasticizer oNPOE.…”

All Solid State Hydrogen Ion Selective Electrode Based on a Tribenzylamine Neutral Carrier in a Poly(vinyl chloride) Membrane with a Poly(aniline) Solid Contact

“…Among them, especially, hydrogen ion selective solvent polymeric membrane electrodes have been studied more than others. The first neutral carrier based solvent polymeric membrane pH electrodes have been developed in Simon's laboratory, where tridodecylamine and other compounds containing basic nitrogen groups have been discovered as selective membrane compounds in pH electrodes [1][2][3][4][5][6][7]. Later, other authors continued this work, thus other various compounds (aliphatic, heteroaromatic and their derivatives [8][9][10][11][12][13][14]) have been studied as carriers of hydrogen ions.…”

Enhanced Electrochemical Performance of Poly(aniline) Solid-Contact pH Electrodes Based on Alkyldibenzylamine

“…The first neutral carrier-based solvent polymeric membrane pH electrodes have been developed in Simon's laboratory, where tridodecylamine and other compounds containing basic nitrogen groups have been discovered as selective membrane compounds in pH electrodes. [17][18][19][20][21][22][23] Later, other authors continued this work, thus other various compounds (aliphatic, heteroaromatic and their derivatives) [24][25][26][27][28][29][30] have been studied as carriers of hydrogen ions. The results have been particularly good for tertiary amine compounds.…”