Environmental sampling articles and methods
The present invention refers to articles for collecting samples from a surface, articles for microbiological analyses of said samples, and methods of use of said articles. The articles include sample collectors, sample housings with optional barrier layers, and sample-ready reagent strips comprising hydrophilic agents to grow and detect microorganisms. The disclosure includes methods to collect, detect, and quantify microorganisms in a surface sample.
1. A kit for sampling and enumerating microorganisms, the kit comprising:
a sample housing comprising
a bottom member comprising a self-supporting water impervious substrate with upper and lower major surfaces;
a cover sheet comprising a substrate with upper and lower major surfaces wherein at least part of one major surface of the cover sheet comprises a coating of a cold water soluble powder including at least one gelling agent; and
a water-impermeable barrier layer attached to the bottom member or the cover sheet, wherein the barrier layer is positioned between the cover sheet and the bottom member;
wherein the cover sheet is attached to the bottom member and wherein the powder faces the upper major surface of the bottom member.
2. The kit according to claim 1 , further comprising a sample collector with upper and lower major surfaces substantially free of hydrophilic agents, wherein at least one major surface of the sample collector is water-impervious, wherein at least one major surface of the sample collector comprises a porous material.
3. The kit according to claim 1 , further including a reagent strip comprising a self-supporting substrate with upper and lower major surfaces wherein at least part of one major surface of the reagent strip comprises a coating of a cold water soluble gelling agent and a hydrophilic agent selected from the group consisting of a nutrient for growing microorganisms, a selective agent, an indicator, and combinations of any two or more of the foregoing.
4. The kit according to claim 1 , wherein a portion of the barrier layer is detachably attached to the sample housing.
5. The kit according to claim 1 , wherein at least one major surface of the sample collector further comprises a porous material.
6. The kit according to claim 1 , wherein the sample housing further comprises a spacer containing an aperture wherein the spacer is adhered to the upper surface of the bottom member.
7. The kit according to claim 1 , wherein the sample collector further comprises a tab.
8. The kit according to claim 7 , wherein the tab is detachable.