TY - JOUR
T1 - Fibre-optic potassium ion sensors based on a neutral ionophore and a novel lipophilic anionic dye
AU - Suzuki, Koji
AU - Ohzora, Hiroyuki
AU - Tohda, Koji
AU - Miyazaki, Kyota
AU - Watanabe, Kazuhiko
AU - Inoue, Hidenari
AU - Shirai, Tsuneo
N1 - Funding Information:
The authors are greateful to the Ministry Education for partial financial assistance.
PY - 1990
Y1 - 1990
N2 - A novel lipophilic anionic dye, N-2,4-dinitro-6-octyloxyphenyl-2′,4′-dinitro-6′-trifluoromethylphenylamine (LAD), was synthesized. On deprotonation at neutral Ph it forms anions and brings about a change in the absorption spectrum in the visible region. This anionic dye was incorporated into a poly(vinyl chloride) matrix membrane with dibenzo-18-crown-6 (DB18C6) or valinomycin, which are K+-selective neutral ionophores. An optical K+ sensor was prepared using the polymeric membrane set 1 mm apart from the tip of a bifurcated optical fibre with a cylindrical plastic support. This sensor could detect a wide range of K+ concentrations (10-6-1 M K+ for the DB18C6-based sensor, 10-8-10-2 M K+ for the valinomycin-based sensor) at Ph 7.0 by measuring the absorbance change at 513 nm. The factors that influence the response sensitivity of the sensor are discussed theoretically.
AB - A novel lipophilic anionic dye, N-2,4-dinitro-6-octyloxyphenyl-2′,4′-dinitro-6′-trifluoromethylphenylamine (LAD), was synthesized. On deprotonation at neutral Ph it forms anions and brings about a change in the absorption spectrum in the visible region. This anionic dye was incorporated into a poly(vinyl chloride) matrix membrane with dibenzo-18-crown-6 (DB18C6) or valinomycin, which are K+-selective neutral ionophores. An optical K+ sensor was prepared using the polymeric membrane set 1 mm apart from the tip of a bifurcated optical fibre with a cylindrical plastic support. This sensor could detect a wide range of K+ concentrations (10-6-1 M K+ for the DB18C6-based sensor, 10-8-10-2 M K+ for the valinomycin-based sensor) at Ph 7.0 by measuring the absorbance change at 513 nm. The factors that influence the response sensitivity of the sensor are discussed theoretically.
KW - Ion sensor
KW - Lipophilic anionic dye
KW - Potassium
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U2 - 10.1016/S0003-2670(00)83913-6
DO - 10.1016/S0003-2670(00)83913-6
M3 - Article
AN - SCOPUS:0025131475
SN - 0003-2670
VL - 237
SP - 155
EP - 164
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
IS - C
ER -