Ion-sensitive field effect transistor as a monovalent cation detector for ion chromatography and its application to the measurement of Na+ and K+ concentrations in serum.
An ion-sensitive field effect transistor, which is a small potentiometric ion-sensing probe, was applied as a detector in the ion chromatography of alkali-metal cations. The cation-sensing transistor was prepared by coating the gate part of the probe to form a poly(vinyl chloride) matrix membrane containing tetranactin, which enables detection of alkali-metal ions such as Na+, K+, Rb+, and Cs+. To be able to analyse amounts less than 1 microliter and make full use of the small ion-sensing probe, we constructed a miniature cation-exchange separation column (support 10 microns polystyrene) with a PTFE tube (20 mm x 1.5 mm I.D. x 2.1 mm O.D). As an application of the system, Na+ and K+ concentrations in serum were determined. The analytical results for these two cations were good agreement with those obtained by flame photometry.
Watanabe
K
K
Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama, Japan.
Tohda
K
K
Sugimoto
H
H
Eitoku
F
F
Inoue
H
H
Suzuki
K
K
Nakamura
S
S
D002412:Cations; D002852:Chromatography, Ion Exchange / Q000295:instrumentation*; D004566:Electrodes; D006801:Humans; D011188:Potassium / Q000097:blood*; D012964:Sodium / Q000097:blood*; D014173:Transistors, Electronic
D002412:Cations; D012964:Sodium; D011188:Potassium