Electrochemical sensor for analysis of liquid samples
First Claim
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1. An electrochemical cell comprising a first electrode, said first electrode comprising:
- a first working area, said first working area comprising a working ink; and
a first auxiliary area, said first auxiliary area comprising a first dummy ink, wherein;
said working ink comprises an enzyme and a first redox mediator; and
said first dummy ink comprises a redox species but lacks an enzyme.
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Abstract
An electrochemical cell having an auxiliary area that contains a redox species on a working electrode. The auxiliary area provides a low resistance current path between the working electrode and a pseudo reference/counter electrode. The auxiliary area is an integral part of the working electrode and allows an enhanced current to flow. The enhanced current adds to the measurement signal. This reduces non-monotonic current decay, which can lead to erroneous analyte measurements.
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Citations
26 Claims
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1. An electrochemical cell comprising a first electrode, said first electrode comprising:
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a first working area, said first working area comprising a working ink; and
a first auxiliary area, said first auxiliary area comprising a first dummy ink, wherein;
said working ink comprises an enzyme and a first redox mediator; and
said first dummy ink comprises a redox species but lacks an enzyme. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
a second working area, said second working area comprising a second dummy ink; and
a second auxiliary area, said second auxiliary area comprising said first dummy ink, wherein said second dummy ink comprises said first redox mediator but lacks an enzyme.
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5. The electrochemical cell of claim 4, wherein said second auxiliary area is located closer to said pseudo reference/counter electrode than is said second working area.
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6. The electrochemical cell of claim 4, wherein said second working area is larger in area than is said second auxiliary area.
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7. The electrochemical cell of claim 4, wherein said first working area is smaller in area than is the sum of the areas of said second working area and said second auxiliary area.
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8. The electrochemical cell of claim 4, wherein said first redox mediator is a ferrocene or a ferrocene derivative and said redox species is a ferrocene or a ferrocene derivative.
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9. The electrochemical cell of claim 4, wherein said enzyme is said working ink is glucose oxidase.
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10. The electrochemical cell of claim 1, wherein said first working area is larger in area than said first auxiliary area.
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11. A biosensor strip comprising:
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an electrode support;
a first electrode disposed on said electrode support, said first electrode comprising;
a first working area, said first working area comprising a working ink; and
a first auxiliary area, said first auxiliary area comprising a first dummy ink, a second electrode disposed on said electrode support, said second electrode comprising;
a second working area, said second working area comprising a second dummy ink; and
a second auxiliary area, said second working area comprising said first dummy ink; and
a pseudo reference/counter electrode disposed on said electrode support, said pseudo reference/counter electrode being spaced apart from said first electrode and said second electrode, wherein;
said working ink comprises an enzyme and a first redox mediator;
said first dummy ink lacks an enzyme and comprises a redox species; and
said second dummy ink lacks an enzyme and comprises said first redox mediator. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of manufacturing an electrochemical cell, said method comprising the steps of:
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applying a working ink to a first electrode to form a first working area; and
applying a first dummy ink to said first electrode to form a first auxiliary area, wherein;
said working ink comprises an enzyme and a first redox mediator; and
said first dummy ink lacks an enzyme and comprises a redox species. - View Dependent Claims (22, 23, 24, 25, 26)
applying a second dummy ink to a second electrode to form a second working area; and
applying said first dummy ink to said second electrode to form a second auxiliary area, wherein;
said second dummy ink lacks an enzyme and comprises said first redox mediator.
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24. The method of claim 23, wherein said second working area is larger in area than said first auxiliary area.
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25. The method of claim 23, wherein said first redox mediator is a ferrocene or a ferrocene derivative and said redox species is a ferrocene or a ferrocene derivative.
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26. The method of claim 23, wherein said enzyme in said working ink is glucose oxidase.
Specification