Flow-through type calcium ion selective optodes based on novel neutral ionophores and a lipophilic anionic dye

Preparation of Sodium Ion-Sensing Plates Based on a Thin Layer Liquid Membrane Containing a Neutral Ionophore and a Lipophilic Anionic Dye

“…3, the activity of the analyte ion (i z+ ) can be represented by the following equation: 1,3,11,15,25 …”

“…(2), a large total extraction constant (K) indicates an optode having an effective measurement range in the low concentration region, compared to that having a small K value. 1,3,11 This total extraction con-…”

“…14 stant (K) of the optode is dependent on the partition coefficients (k) of the membrane components, the stability constant (β) of the ion-ionophore complex, the acid dissociation constant (K a ) of the dye, and the ionpair formation constant (K as ). 1,3,11 Among these constants, the stability constant plays an important role for obtaining the large total extraction constants. Focusing on the difference in chemical structures between C14-DD16C5 and C14-DTM16C5, we see that C14-DD16C5 has a more rigid structure than that of C14-DTM16C5.…”

“…Many kinds of ion-selective optodes for various analytes have been reported, such as Li + , 1 Na + , 2 K + , [3][4][5] NH 4 + , 6,7 Mg 2+ , 8 Ca 2+ , [8][9][10][11][12] Zn 2+ , 13 Ag + , 14,15 Hg 2+ , 14 UO 2 2+ , 16 Pb 2+ , 17 HSO 3 -, 18 Cl -, 19,20 , and heparin; 21 their theoretical methodologies have also been investigated. 1,3,11,22,23 In the field of dry reagent chemistry, simple chemical sensing probes such as protein and sugar test papers were developed. 24 A combination of ion-selective optode methodology based on an ion-extraction or ion-exchange mechanism and dry reagent chemistry was carried out recently in our research group.…”

Optochemical Sensor for an Ornidazole Assay Using 1-Amino-4-allyloxyanthraquinone as a Fluorescent Indicator

“…[23][24][25][26][27][28] While contacting with an AAA-immobilized optode membrane, ornidazole in an aqueous sample solution was extracted into the membrane phase and interacted with AAA.…”