Methods and devices for integrating analyte extraction, concentration and detection
Disclosed herein are devices and methods that use aqueous two phase systems and lateral flow assays to detect target analytes in a sample. These devices and methods may be used to diagnose a disease or condition in a biological sample, such as blood or serum. In addition, these devices and methods may be used to detect allergens in a food samples or contaminants, such as environmental toxins, in water samples. Device and kit components may be conveniently assembled in a portable container and are amenable to actuation in most settings. The devices are simple to use, requiring a non-trained operator to simply add the sample to the device. Conveniently, the time it takes to detect the target analyte is very short. Thus, the devices and methods disclosed herein provide novel and useful means for point-of-care.
1. A device for the detection and/or quantification of a target analyte in a sample, the device comprising:
a. a lateral flow assay (LFA) comprising a porous matrix; and
b. an aqueous two-phase system (ATPS), wherein the ATPS comprises a mixed phase solution that separates into a first phase solution and a second phase solution, and where components of said first phase solution and components of said second phase solution are both disposed in said porous matrix and are present in sufficient amount to form said two-phase ATPS within said porous matrix, and where the first phase solution comprises a micellar solution.
2. The device of claim 1 , wherein said device is configured to provide the separation of the mixed phase into the first phase solution and the second phase solution occurs within said porous matrix.
3. The device of claim 1 , wherein the target analyte is in contact with the mixed phase solution, and wherein the target analyte partitions into the first phase solution or the second phase solution.
4. The device of claim 1 , wherein the target analyte is in contact with the mixed phase solution, and wherein the target analyte partitions to an interface of the first phase solution and the second phase solution.
5. The device of claim 1 , wherein the first phase solution comprises one or more surfactants and the second phase solution comprises a polymer.
6. The device of claim 1 , wherein the first phase solution comprises one or more surfactants and the second phase solution comprises a salt.
7. The device of claim 1 , wherein a component of the first phase solution and/or a component of the second phase solution is dehydrated on and/or in said porous matrix, and upon addition of the sample, the mixed phase solution partitions into the first phase solution and the second phase solution.
8. A method of detecting or quantifying a target analyte in a sample, the method comprising:
i) applying the sample to a device comprising:
a. a lateral flow assay (LFA) comprising a porous matrix; and
b. an aqueous two-phase system (ATPS), wherein the ATPS comprises a mixed phase solution that separates into a first phase solution and a second phase solution, and where components of said first phase solution and components of said second phase solution are both disposed in said porous matrix and are present in sufficient amount to form said two-phase ATPS within said porous matrix, and where the first phase solution comprises a micellar solution; and
ii) detecting the presence or absence and/or quantifying the target analyte.
9. The method of claim 8 , wherein the separation of the mixed phase into the first phase solution and the second phase solution occurs within said porous matrix.
10. The method of claim 8 , wherein the target analyte is in contact with the mixed phase solution, and wherein the target analyte partitions into the first phase solution or the second phase solution in said porous matrix.
11. The method of claim 8 , wherein said target analyte comprises a bacterium.
12. The method of claim 9 , wherein said target analyte comprises a bacterium of a genus selected from the group consisting of Streptococcus, Chlamydia, Mycobacterium , and Neisseria.
13. The method of claim 10 , wherein said target analyte comprises Streptococcus mutans.
14. The method of claim 8 , wherein said first phase solution comprises a nonionic surfactant.
15. The method of claim 14 , wherein said first phase solution comprises a surfactant is selected from the group consisting of a cetomacrogol, a cetostearyl alcohol, a cetyl alcohol, a cocamide, a decyl glucoside, an IGEPAL, an isoceteth, a lauryl glucoside, a monolaurin, a nonidet, a nonoxynol, an NP-40, an octyl glucoside, an oleyl alcohol, a poloxamer, a pentaethylene glycol monododecyl ether, a polysorbate, a polyglycerol, a sorbitan, a stearyl alochol, a Triton-X, and a Tween.
16. The method of claim 15 , wherein said surfactant comprises a Triton X-114 solution.
17. The method of claim 14 , wherein the second phase solution comprises a salt.
18. The method of claim 17 , wherein the second phase solution comprises potassium phosphate.
19. The method of claim 14 , wherein the first phase solution comprises Triton X-114 and the second phase solution comprises potassium phosphate.
20. The device of claim 1 , wherein said lateral flow assay is configured to detect and/or quantify a target analyte that is a bacterium.
21. The device of claim 20 , wherein said target analyte comprises a bacterium of a genus selected from the group consisting of Streptococcus, Chlamydia, Mycobacterium , and Neisseria.
22. The device of claim 21 , wherein said target analyte comprises Streptococcus mutans.
23. The device of claim 1 , wherein said first phase solution comprises a nonionic surfactant.
24. The device of claim 23 , wherein said first phase solution comprises a surfactant is selected from the group consisting of a cetomacrogol, a cetostearyl alcohol, a cetyl alcohol, a cocamide, a decyl glucoside, an IGEPAL, an isoceteth, a lauryl glucoside, a monolaurin, a nonidet, a nonoxynol, an NP-40, an octyl glucoside, an oleyl alcohol, a poloxamer, a pentaethylene glycol monododecyl ether, a polysorbate, a polyglycerol, a sorbitan, a stearyl alochol, a Triton-X, and a Tween.
25. The device of claim 24 , wherein said surfactant comprises a Triton X-114 solution.
26. The device of claim 1 , wherein the second phase solution comprises a salt.
27. The device of claim 26 , wherein the second phase solution comprises potassium phosphate.
28. The device of claim 1 , wherein the first phase solution comprises Triton X-114 and the second phase solution comprises potassium phosphate.