Device for selective collection and condensation of exhaled breath

1. A device for selective collection of exhaled breath condensate, wherein the device comprises:

a) mouthpiece configured to receive an exhaled breath from a human subject, wherein the exhaled breath comprises a first portion that is not deep lung air and a second portion that is deep lung air, wherein the deep lung air comprises at least one chemical to be detected;

b) a first output configured to release the first portion of the exhaled breath that is not deep lung air;

c) a second output configured to collect the second portion of the exhaled breath that is deep lung air, wherein the deep lung air comprises at least one chemical to be detected;

d) a sensor for detecting a temperature;

e) a valve, which is connected to the mouthpiece, the first output and the second output, wherein the valve is actuated by a temperature-based algorithm to selectively release the first portion of the exhaled breath, and selectively collect the second portion of the exhaled breath, wherein the valve opens into the second output when the difference between a current breath temperature and a breath temperature at the start of the exhalation period exceeds a calculated temperature threshold, and the valve closes after two successive decreases in the breath temperature, wherein the temperature threshold is calculated based on a temperature range of the last three breaths of the human subject; and

f) a collection unit comprising a frame including (i) a plate, which is connected to the second output connected to the valve, (ii) a condensation plate, and (iii) a wiper, wherein the collection unit is configured to collect and condense the second portion of the exhaled breath and the wiper wipes the liquid from the collection unit.

2. The device of claim 1 , wherein the chemical comprises glucose, nucleic acid, protein, peptide, lipid, inositol, cytokine, amylase, lipoarabinomannan, interferon gamma, nitrite, pathogen, hydrogen peroxide, opioid, nicotine salt, lactate, or any combination thereof.

3. The device of claim 1 , wherein the chemical comprises glucose.

4. The device of claim 1 , wherein the sensor can detect wind speed of a passing air flow.

5. The device of claim 1 , wherein said condensation unit the collection unit has a temperature range of −20° C. to 15° C.

6. The device of claim 1 , wherein the collection unit has a temperature range of 5° C. to 15° C.

7. The device of claim 1 , wherein the device is portable and can collect and condense reproducible volumes of the exhaled breath under ten minutes.

8. The device of claim 1 , wherein the valve is a pneumatic valve, a solenoid valve, or any valve that can be controlled to open and close to selectively control collection of the second portion of the exhaled breath.

9. A method of collecting at least one chemical to be detected, wherein the method comprises:

providing a device of claim 1 to a human subject;

collecting an exhaled breath from the human subject through a mouthpiece;

actuating a valve by a temperature-based algorithm including:

(i) selectively releasing a first portion of the exhaled breath which is not deep lung air, through a first output of the device; and

(ii) selectively collecting a second portion of the exhaled breath, which is deep lung air, with a second output of the device, wherein the deep lung air comprises at least one chemical to be detected; and

wherein the valve opens into the second output when the difference between a current breath temperature and a breath temperature at the start of the exhalation period exceeds a calculated temperature threshold, and the valve closes after two successive decreases in the breath temperature, wherein the temperature threshold is calculated based on a temperature range of the last three breaths of the human subject.