Methods, devices, and systems of detecting microorganisms
A rapid, sensitive method of separating and detecting microorganisms from a sample potentially containing microorganisms, such as but not limited to bacteria, fungi, yeast, viruses, and the like. The method relies on separation techniques to separate and concentrate the cells from the sample, together with chemical techniques to amplify the amount of detectable signal from low numbers of cells to provide a rapid and sensitive method of detecting microorganisms. This detection method may utilize: a filtration device; a centrifugation device; a system; a swab device; and kit comprising one or more of the devices and components to perform the present method of separating and detecting microorganisms in a sample potentially containing microorganisms. The sample may be a chemical, cosmetic, personal care, pharmaceutical, or consumable good in its raw material, in-process, and/or finished product states that needs to be tested for any contaminating microorganisms prior to shipment to the consumer.
1. A method of detecting microorganisms in a sample potentially containing microorganisms, comprising:
a) filtering the sample through a pre-filter for allowing microorganisms to flow through;
b) filtering the pre-filter filtrate through a capture filter for retaining microorganisms;
c) culturing the microorganisms retained on the capture filter;
d) lysing the cultured microorganisms with extractant in combination with adenosine diphosphate;
e) filtering the lysed microorganisms through the capture filter;
f) adding luciferin and luciferase to the lysed microorganism filtrate, which produces a light; and
g) detecting the light using a luminometer, which indicates the presence of microorganisms in the sample.
2. The method of claim 1 , wherein the pre-filter is a filter of a double-layer filter or two separate filters.
3. A method of detecting microorganisms in a sample containing microorganisms, comprising:
a) filtering the sample through a pre-filter for allowing microorganisms to flow through;
b) filtering the pre-filter filtrate through a capture filter for retaining microorganisms;
c) culturing the microorganisms retained on the capture filter;
d) lysing the cultured microorganisms with extractant in combination with a marker molecule substrate;
e) filtering the lysed microorganisms through the capture filter;
f) adding a detection assay reagent to the lysed microorganism filtrate, which produces a light; and
g) detecting the light using a detection device, which indicates the presence of microorganisms in the sample.
4. The method of claim 2 , wherein the double-layer filter and two separate filters each has filters of sequentially decreasing pore sizes.
5. The method of claim 1 , wherein the sample contacts the pre-filter comprising a first filter having a pore size large enough to allow passage of microorganisms and retain non-microbial particles and a second filter having a pore size that is smaller than that of the first filter and large enough to allow passage of microorganisms and retain non-microbial particles.
6. The method of claim 2 , wherein the first and second filters of the pre-filter have a pore size ranging from about 5 to about 100 microns.
7. The method of claim 1 , wherein the capture filter has a pore size ranging from about 0.2 to about 4 microns.