Detection device having capture region and detection region
The invention features a fully-integrated rapid molecular diagnostic device that is low-cost, easy to manufacture, and simple to use. The device can serve as a molecular diagnostic platform for any disease, requiring little or no preparation or customization and can be made from simple materials (e.g., paper and adhesive film), making it inexpensive, portable, and disposable. The invention also provides methods of using the device for detection of one or more targets in a sample.
1. A detection device, the device comprising:
(a) a capture region for binding a target in a sample;
(b) a waste region connected to the capture region, wherein the waste region can absorb a non-target fraction of the sample, wherein the waste region can be disconnected from the capture region by folding or tearing;
(c) a detection region separated from the capture region by a removable tab that prevents transfer of liquid from the capture region to the detection region; and
(d) a non-absorbent housing that prevents moisture transfer,
wherein the housing comprises a film, and wherein the film is perforated for tearing.
2. The device of claim 1 , wherein the removable tab can be disconnected from the device by tearing.
3. The device of claim 1 , further comprising a protective flap connected to the housing that can be folded onto the capture region to prevent moisture loss.
4. The device of claim 3 , wherein the film comprises the protective flap.
5. The device of claim 1 , wherein the removable tab and the housing are connected and cut from a single planar sheet of film.
6. The device of claim 1 , wherein the waste region comprises cellulose.
7. The device of claim 1 , wherein the detection region comprises a lateral flow detection strip; the detection region comprises one or more detection probes; and/or the detection region comprises one or more visible particles or detection antibodies.
8. The device of claim 1 , wherein a portion of the housing in contact with the capture region comprises cyclo olefin polymer (COP) and/or a transfer layer is sandwiched between the capture region and the waste region, the transfer layer configured to wick fluid into the waste region.
9. The device of claim 1 , wherein the capture region comprises a polyethersulfone (PES) membrane.
10. The device of claim 1 , wherein the capture region is impregnated with one or more isothermal nucleic acid amplification reagents.
11. The device of claim 10 , wherein the isothermal nucleic acid amplification reagents comprise reagents for loop-mediated isothermal amplification (LAMP), helicase dependent amplification (HDA), rolling circle amplification (RCA), multiple displacement amplification (MDA), recombinase polymerase amplification (RPA), or nucleic acid sequence base amplification (NASBA).
12. The device of claim 1 , wherein the film comprises the removable tab.
13. A method for detecting the presence or absence of at least one target in a sample, the method comprising:
(a) providing the device of claim 1 ;
(b) applying a sample to the capture region, wherein the sample comprises the target and a non-target fraction, and wherein the target binds to the capture region and the non-target fraction wicks into the waste region;
(c) eluting the target from the capture region to the detection region; and
(d) detecting the presence of the target in the detection region.
14. The method of claim 13 , wherein the target comprises a nucleic acid.
15. The method of claim 14 , wherein step (b) further comprises isothermal nucleic acid amplification.
16. The method of claim 15 , wherein the isothermal nucleic acid amplification comprises loop-mediated isothermal amplification (LAMP), helicase dependent amplification (HDA), rolling circle amplification (RCA), multiple displacement amplification (MDA), recombinase polymerase amplification (RPA), or nucleic acid sequence base amplification (NASBA).
17. The method of claim 13 , wherein the capture region comprises polyethersulfone (PES) or the capture region is impregnated with one or more isothermal nucleic acid amplification reagents.
18. The method of claim 13 , wherein step (c) comprises disconnecting the removable tab.
19. The method of claim 13 , further comprising applying a liquid buffer to the capture region.
20. The method of claim 13 , further comprising heating the capture region.
21. The method of claim 20 , wherein the heating brings the capture region to a temperature of between 30° C. and 80° C.
22. The method of claim 21 , wherein the temperature is about 65° C.
23. The method of claim 20 , wherein the heating is provided by a heat block, a battery-powered heater, a thin-film heater, or a disposable exothermic heat pack.
24. A method of constructing the device of claim 1 , the method comprising:
(a) providing the capture region, the waste region, and the detection region;
(b) folding a thin sheet to cover more than 50% of the surface area of the detection region to produce the housing.