Electrochemical sensor having an immobilized enzyme membrane
US4579642A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1984 |
| Grant date | Apr 1, 1986 |
| Priority date | — |
| Expiry date | Nov 7, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S435/817
- WIPO fieldBiotechnology
- WIPO sectorChemistry
Abstract
A recess of a predetermined thickness is formed in the bottom of a cylindrical vessel and a hole for the liquid-junction is formed at the center of the recess, to which is joined a resilient NH.sub.4.sup.+ selective membrane. Since the NH.sub.4.sup.+ selective membrane has a thickness larger by about 0.1 mm than the depth of the recess, the NH.sub.4.sup.+ selective membrane is protruded out of the bottom of the vessel by so much. A polyester woven fabric on which urease is immobilized is attached to the vessel so as to cover the NH.sub.4.sup.+ selective membrane. Since the immobilized enzyme membrane is applied with an appropriate tension by the slightly protruded ion selective membrane, bondability between the two membranes can be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.