Methods and devices for removing interfering species
First Claim
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1. A hydrogel, comprising:
- polyethylene oxide present in an amount of about 4% to about 20% by weight based on the total weight of the hydrogel;
water in an amount of about 95% or less based on the total weight of the hydrogel;
a chloride salt, wherein background electrical signal in the gel is less than approximately 200 nA;
a phosphate buffer in an amount sufficient to maintain a pH in the hydrogel in the range of 6 to 8;
an enzyme composition comprising glucose oxidase, said glucose oxidase present in an amount of from about 10 units to about 5,000 units per gram of the total weight of the hydrogel; and
a biocide comprising an undecylenate.
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Abstract
This invention relates to methods for reducing the presence of a compound in an ionically conductive material, e.g., for use in iontophoretic devices, wherein the presence of the compound interferes with detecting a selected analyte. Removal of the compound can typically take place either during or after the manufacture of the ionically conductive material or an assembly comprising this material. Also disclosed are methods for generating selectively permeable barriers on the reactive faces of electrodes. Further, this invention relates to hydrogels comprising one or more biocides, as well as assemblies containing such hydrogels.
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Citations
26 Claims
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1. A hydrogel, comprising:
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polyethylene oxide present in an amount of about 4% to about 20% by weight based on the total weight of the hydrogel;
water in an amount of about 95% or less based on the total weight of the hydrogel;
a chloride salt, wherein background electrical signal in the gel is less than approximately 200 nA;
a phosphate buffer in an amount sufficient to maintain a pH in the hydrogel in the range of 6 to 8;
an enzyme composition comprising glucose oxidase, said glucose oxidase present in an amount of from about 10 units to about 5,000 units per gram of the total weight of the hydrogel; and
a biocide comprising an undecylenate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
applying a device comprising the hydrogel of claim 1, said hydrogel in contact with an electrode, to the skin of the subject, and generating an electrical current that moves the glucose through the skin and into the hydrogel. -
22. A method for detecting an amount of glucose in a subject, comprising
extracting glucose through a skin surface of the subject using a device comprising the hydrogel of claim 1 contact with an electrode, generating an electrical current that moves the glucose through the skin and into the hydrogel, detecting the amount of glucose present in the hydrogel, and relating the amount of glucose in the hydrogel to the amount of glucose in the subject. -
23. The hydrogel of claim 1, wherein said hydrogel further comprises bisacrylamide.
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24. The hydrogel of claim 1, wherein said biocide is present in the hydrogel at a concentration of between about 0.01% to about 5% based on the total weight of the hydrogel.
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25. The hydrogel of claim 24, wherein said biocide is present in the hydrogel at a concentration of between about 0.1% to about 1% based on the total weight of the hydrogel.
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26. The hydrogel of claim 25, wherein said biocide is present in the hydrogel at a concentration of between about 0.2% to about 0.5% based on the total weight of the hydrogel.
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Specification