Use of acid to stabilize indicator dyes in acrylate adhesives

Chemistry: analytical and immunological testing – Composition for standardization – calibration – simulation,...

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422 56, 435299, C12M 116

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active

054098386

ABSTRACT:
The present invention provides a culture device for growing microorganisms having a self supporting substrate coated with a cold-water soluble dry powder which is a mixture of gelling agents and nutrients and a transparent cover sheet having a layer of a water-soluble pressure sensitive adhesive containing indicator dyes on a surface adjacent to the substrate wherein the improvement includes either adding a sufficient amount of a water-insoluble organic acid to the adhesive or including a sufficient amount of acrylic acid as a comonomer in the adhesive in order to inhibit or prevent a premature color change of the indicator dyes.

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Fred et al., "The Reduction of 2,3,5-Triphenyltetrazolium Chloride by Penicillium chrysogenum", Science, vol. 109, pp. 169-170, Feb. 18, 1949.

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