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An improved synthetic, polymer hydrogel permeation layer for use with an active electronic matrix device for biological assays. The permeation layer includes a dried coating of raffinose or a combination of raffinose and stachyose to protect the permeation layer from degradation during shipping and

An improved synthetic, polymer hydrogel permeation layer for use with an active electronic matrix device for biological assays. The permeation layer includes a dried coating of raffinose or a combination of raffinose and stachyose to protect the permeation layer from degradation during shipping and storage.

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We claim: 1. A sugar-based coating for a permeation layer overlying an electrode on a substrate, the coating comprising a solution of raffinose and stachyose in combination. 2. The sugar-based coating of claim 1, wherein the solution of raffinose and stachyose further comprises raffinose and stac

We claim: 1. A sugar-based coating for a permeation layer overlying an electrode on a substrate, the coating comprising a solution of raffinose and stachyose in combination. 2. The sugar-based coating of claim 1, wherein the solution of raffinose and stachyose further comprises raffinose and stachyose in combination in an amount of between about 0.5% by weight to about 10% by weight, and wherein the permeation layer comprises a material selected from the group consisting of hydrogels and sol-gels. 3. A method of coating a permeation layer overlying an electrode on a substrate, the method comprising the steps of: a. preparing a permeation layer b. preparing a sugar-based preservative solution comprising raffinose and stachyose in combination in an amount of between about 0.5% by weight to about 10% by weight; c. covering the permeation layer with an amount of preservative solution sufficient to substantially cover an outside surface of the permeation layer; and d. allowing preservative solution to dry on the permeation layer, wherein the permeation layer comprises a material selected from the group consisting of hydrogels and sol-gels. 4. The method of claim 3, wherein the sugar-based preservative solution comprises about 5% raffinose by weight and about 5% stachyose by weight. 5. The method of claim 3, wherein the sugar-based preservative solution comprises about 9% raffinose by weight and about 1% stachyose by weight. 6. The method of claim 3, wherein the sugar-based preservative solution comprises about 0% raffinose by weight and about 10% stachyose by weight. 7. A sugar-based coating for a permeation layer overlying an electrode on a substrate, the coating comprising a solution of stachyose. 8. The sugar-based coating of claim 7, wherein the solution of stachyose further comprises stachyose in an amount of between about 0.5% by weight to about 10% by weight.