Patent US3713374A successfully refreshed from Google Patents.
Patent US5031449A successfully refreshed from Google Patents.
US5031449A
Expired / Lapsed
US
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Electrochemical detector for liquid chromatographic analysis of carbohydrates
Assignee: Shimadzu Corp
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Filing: 1990-03-02
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Granted: 1991-07-16
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Expires: 2010-03-02
Abstract
Abstract A highly sensitive and selective electrochemical detector has been developed for the liquid chromatograph analysis of carbohydrates. This detector includes copper particles and copper particles coated with copper oxide particles dispersed in a perfluorosulfonate ionomer film which is cast onto the surface of a glassy carbon electrode. The copper is electrochemically dispersed into the perfluorosulfonate ionomer by a constant potential method. The response of the detector is based on the electrolytic generation of a higher oxidation state species of copper catalytically oxidizing carbohydrates in alkaline solutions at a pH greater than 13.
Inventors
- 👤 Theodore Kuwana
- 👤 Juan Marioli
- 👤 Javad M. Zadeii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:35
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/64; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/308; G01N35/00; G01N35/08; G01N35/085
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
34 words
An electrode, comprising: a) a glassy carbon substrate; b) a surface of the glassy carbon substrate coated with a perfluorosulfonate ionomer; and c) copper and copper oxide particles electrochemically incorporated into the perfluorosulfonate ionomer.
Claim 2
Dependent Claim
34 words
An electrode, comprising: a) a glassy carbon substrate; b) a surface of the glassy carbon substrate coated with a perfluorosulfonate ionomer; and c) copper and copper oxide particles electrochemically incorporated into the perfluorosulfonate ionomer.
Claim 3
Dependent Claim
19 words
The electrode of claim 1 wherein the copper and copper oxide particles are randomly dispersed in the perfluorosulfonate ionomer.
Claim 4
Dependent Claim
17 words
The electrode of claim 1, wherein the perfluorosulfonate ionomer coating is 2 to 10 μ meters thick.
Claim 5
Dependent Claim
23 words
The electrode of claim 2, wherein the amount of copper present in the perfluorosulfonate ionomer coating is between 0.1 to 0.25 μ mol.
Claim 6
Dependent Claim
19 words
The electrode of claim 2, wherein the copper and copper oxide particles are approximately 1 μm to 3 μm.
Claim 7
Dependent Claim
45 words
In a high performance liquid chromatographic assay for the analysis of carbohydrates, the improvement comprising: using a detector comprising a glassy carbon substrate having on a surface thereof a perfluorosulfonate ionomer coating and particles of copper and copper oxides electrochemically incorporated into the perfluorosulfonate ionomer.
Claim 8
Dependent Claim
45 words
In a high performance liquid chromatographic assay for the analysis of carbohydrates, the improvement comprising: using a detector comprising a glassy carbon substrate having on a surface thereof a perfluorosulfonate ionomer coating and particles of copper and copper oxides electrochemically incorporated into the perfluorosulfonate ionomer.
Claim 9
Dependent Claim
50 words
In a chromatographic apparatus for the analytical detection of carbohydrates including an injector, a column and a detector, the improvement comprising a detector comprising a glassy carbon substrate having on a surface thereof a perfluorosulfonate ionomer coating and particles of copper and copper oxides electrochemically incorporated into the perfluorosulfonate ionomer.
Claim 10
Dependent Claim
50 words
In a chromatographic apparatus for the analytical detection of carbohydrates including an injector, a column and a detector, the improvement comprising a detector comprising a glassy carbon substrate having on a surface thereof a perfluorosulfonate ionomer coating and particles of copper and copper oxides electrochemically incorporated into the perfluorosulfonate ionomer.
References Cited (Backward Citations)
US4975172A
Cited
US4877694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |