Ion sensor
First Claim
1. An ion sensor having an ion selectivity, which comprises an internal solid electrode of metal/metal salt, comprising of an electroconductive layer of at least one metal and a layer of an insoluble salt of the metal in contact with the electroconductive layer, an ion selective membrane whose supporting membrane comprises a hydrophobic polymer, and an intermediate layer which keeps water molecules, provided between the internal solid electrode and the ion selective membrane, the intermediate layer comprises of dried residues of an aqueous solution comprising an inorganic compound having a water-keeping property or an organic compound having a water-keeping property, a hydrophilic polymer and an inorganic salt.
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Abstract
An ion sensor having an ion selectivity, which comprises an internal electrode of metal/metal salt, composed of an electroconductive layer of at least one metal and a layer of an insoluble salt of the metal in contact with the electroconductive layer, an ion selective membrane whose supporting membrane is composed of a hydrophobic polymer, and an intermediate layer capable of keeping water molecules, provided between the internal solid electrode and the ion selective membrane, where the organic compound having a water-keeping property is polymethylene glycol, polyethylene glycol or polypropylene glycol, each having a molecular weight of 200 to 600, and the inorganic compound having a water-keeping property is calcium chloride, gold chloride, magnesium perchlorate, magnesium fluoride or vanadium chloride dioxide, is suitable for analysis of specific ion species in a biological fluid with practically prolonged maintenance of properties of electrode.
30 Citations
30 Claims
- 1. An ion sensor having an ion selectivity, which comprises an internal solid electrode of metal/metal salt, comprising of an electroconductive layer of at least one metal and a layer of an insoluble salt of the metal in contact with the electroconductive layer, an ion selective membrane whose supporting membrane comprises a hydrophobic polymer, and an intermediate layer which keeps water molecules, provided between the internal solid electrode and the ion selective membrane, the intermediate layer comprises of dried residues of an aqueous solution comprising an inorganic compound having a water-keeping property or an organic compound having a water-keeping property, a hydrophilic polymer and an inorganic salt.
- 13. An ion sensor having an ion selectivity, which comprises an internal solid electrode of metal/metal salt, comprising of an electroconductive layer of at least one metal and a layer of an insoluble salt of the metal in contact with the electroconductive layer, an ion selective membrane whose supporting membrane comprises a hydrophobic polymer, and an intermediate layer which keeps water molecules, provided between the internal solid electrode and the ion selective membrane, the intermediate layer comprises dried residues of an aqueous solution comprising a mixture of a hydrophilic polymer, an inorganic salt, an inorganic compound having a water-keeping property and an organic compound having a water-keeping property.
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20. An ion sensor having an ion selectivity, which comprises an internal solid electrode of metal/metal salt, comprising an electroconductive layer of at least one metal and a layer of an insoluble salt of the metal in contact with the electroconductive layer, an ion selective membrane whose supporting membrane comprises a hydrophobic polymer, and an intermediate layer which keeps water molecules, provided between the internal solid electrode and the ion selective membrane, the intermediate layer comprises dried residues of an aqueous solution comprising an inorganic compound having a water-keeping property or an organic compound having a water-keeping property, a hydrophilic polymer and an inorganic salt, where the organic compound having a water-keeping property is selected from the group consisting of polymethylene glycol, polyethylene glycol and polypropylene glycol and has a molecular weight of 200 to 600, and the inorganic compound having a water-keeping property is selected from the group consisting of calcium chloride, gold chloride, magnesium perchlorate, magnesium fluoride and vanadium chloride dioxide.
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21. An ion sensor having an ion selectivity, which comprises an internal solid electrode of metal/metal salt, comprising of an electroconductive layer of at least one metal and a layer of an insoluble salt of the metal in contact with the electroconductive layer, an ion selective membrane whose supporting membrane comprises a hydrophobic polymer, and an intermediate layer which keeps water-molecules, provided between the internal solid electrode and the ion selective membrane, the intermediate layer comprises dried residues of an aqueous solution comprising a hydrophilic polymer, an inorganic salt and a polymer of hydrazine derivative represented by the following chemical formula:
- ##STR3## where R and R'"'"' are hydrogen atoms, alkyl groups or hydroxyl groups and n>
1.
- ##STR3## where R and R'"'"' are hydrogen atoms, alkyl groups or hydroxyl groups and n>
- 22. An ion sensor having an ion selectivity, which comprises an internal solid electrode of metal/metal salt, comprising an electroconductive layer of at least one metal and a layer of an insoluble salt of the metal in contact with the electroconductive layer, an ion selective membrane whose supporting membrane comprises a hydrophobic polymer, and an intermediate layer which keeps water molecules, provided between the internal solid electrode and the ion selective membrane, the intermediate layer comprises dried residues of an aqueous solution comprising a chain compound or a cyclic compound having at least one double bond and containing at least one nitrogen atom, and a hydrophilic polymer.
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30. An ion sensitive field effect transistor, which comprises a substrate, source and drain formed on the substrate, an insulation membrane covering the sources and the drains, and an ion selective membrane whose supporting membrane comprises a hydrophobic polymer, and an intermediate layer provided between the insulation membrane and the ion selective membrane, the intermediate layer comprises dried residues of one of an aqueous solution comprising an inorganic compound having a water-keeping property or an organic compound having a water-keeping property, a hydrophilic polymer and an inorganic salt;
- an aqueous solution comprising a mixture of a hydrophilic polymer, an inorganic salt, an inorganic compound having a water-keeping property and an organic compound having a water-keeping property;
an aqueous solution comprising an inorganic compound having a water-keeping property or an organic compound having a water-keeping property, a hydrophilic polymer and an inorganic salt, where the organic compound having a water-keeping property is selected from the group consisting of polymethylene glycol, polyethylene glycol and polypropylene glycol and has a molecular weight of 200 to 600, and the inorganic compound having a water-keeping property is selected from the group consisting of calcium chloride, gold chloride, magnesium perchlorate, magnesium fluoride and vanadium chloride dioxide;
an aqueous solution comprising a hydrophilic polymer, an inorganic salt and a polymer of hydrazine derivative represented by the following chemical formula;
##STR4## where R and R'"'"' are hydrogen atoms, alkyl groups or hydroxyl groups and n≧
1; and
an aqueous solution comprising a chain compound or a cylic compound having at least one double bond and containing at least one nitrogen atom and a hydrophilic polymer.
- an aqueous solution comprising a mixture of a hydrophilic polymer, an inorganic salt, an inorganic compound having a water-keeping property and an organic compound having a water-keeping property;
Specification