RAPID DETECTION OF VOLATILE ORGANIC COMPOUNDS FOR IDENTIFICATION OF MYCOBACTERIUM TUBERCULOSIS IN A SAMPLE

• US 20100291617A1
• Filed: 04/27/2010
• Published: 11/18/2010
• Est. Priority Date: 04/27/2009
• Status: Active Grant

• Current Assignee: Charles Stark Draper Laboratory Incorporated
• Original Assignee: Charles Stark Draper Laboratory Incorporated
• Inventors: Rearden, Preshious, Trevejo, Jose M.
• Granted Patent: US 8,518,663 B2
• Time in Patent Office: Days
• US Class Current: 435/34
• CPC Class Codes: C12Q 1/04 Determining presence or kind of microorganism; Use of selective media for testing antibiotics or bacteriocides; Compositions containing a chemical indicator therefor C12Q1/6897 takes precedence
• CPC Class Codes: G01N 2333/35 from Mycobacteriaceae (F)

Abstract

In various embodiments, the invention relates to a method for identifying the presence of particular bacteria in a sample. The method includes collecting a sample that includes or has been exposed to the particular bacteria and detecting, in the sample, at least one volatile organic compound indicative of the presence of the bacteria.

Claims

1. A method for identifying Mycobacterium tuberculosis bacteria in a sample, the method comprising:

detecting one or more volatile organic compounds indicative of a presence of or response to treatment or resistance of the Mycobacterium tuberculosis bacteria in the sample, the one or more volatile organic compounds being selected from the group consisting of ethyl propionate, 1-pentanol, methyl valerate, 1-hexanol, ethyl valerate, methyl caproate, ethyl caproate, and any of the foregoing compounds in isotopically labeled form.

2. The method of claim 1, wherein the one or more volatile organic compounds comprises methyl caproate.

3. The method of claim 1, wherein the one or more volatile organic compounds comprises 1-hexanol.

4. The method of claim 1, wherein a combination of two or more volatile organic compounds is indicative of the presence of or response to treatment or resistance of Mycobacterium tuberculosis in the sample.

5. The method of claim 1, wherein the one or more volatile organic compounds comprises methyl caproate and 1-hexanol.

6. The method of claim 1, further comprising collecting from a subject a sample suspected of comprising Mycobacterium tuberculosis bacteria.

7. The method of claim 1, further comprising detecting one or more volatile organic compounds indicative of a presence of or response to treatment or resistance of the Mycobacterium tuberculosis bacteria in the sample, the one or more volatile organic compounds being selected from the group consisting of methoxybenzene (anisole), 2-butanone, methyl 2-ethylhexanoate, a chiral version of methyl 2-ethylhexanoate, methyl propionate, 2-pentanone, 3-pentanone, 2,4-dimethyl-1-heptene, methyl isobutyl ketone, 6-methyl-5-hepten-2-one, dimethylsulfoxide, dimethylsulfide, methyl 2-methylpropionate, 1-ethoxy-2-methylpropane, 1-ethoxybutane, t-butyl ethyl ether, isobutanol, and any of the foregoing compounds in isotopically labeled form.

8. The method of claim 7, wherein the method comprises detecting methyl caproate and methyl propionate.

9. The method of claim 1, wherein the sample was exposed to a candidate therapy for treating Mycobacterium tuberculosis.

10. The method of claim 1, wherein the sample comprises exhaled breath from an individual.

11. The method of claim 1, wherein the sample is selected from the group consisting of sputum, blood, urine, pleural fluid, gastric lavage, and pleural biopsy tissue.

12. The method of claim 1, wherein an amount of one or more volatile organic compounds is detected.

13. The method of claim 1, wherein the detecting is performed using a portable device.

14. The method of claim 1, wherein the detecting is performed using a differential mobility spectrometer.

15. A method for identifying Mycobacterium tuberculosis bacteria in a sample, the method comprising:

a. culturing a sample in a media comprising an alkali metal propionate, an alkali metal pentanoate, an alkali metal hexanoate, cholesterol, or any of the foregoing compounds in isotopically labeled form; and

b. detecting one or more volatile organic compounds indicative of a presence of or response to treatment or resistance of the Mycobacterium tuberculosis bacteria from the cultured sample, the one or more volatile organic compounds being selected from the group consisting of ethyl propionate, 1-pentanol, methyl valerate, 1-hexanol, ethyl valerate, methyl caproate, ethyl caproate, and any of the foregoing compounds in isotopically labeled form.

16. The method of claim 15, wherein the one or more volatile organic compounds comprises methyl caproate.

17. The method of claim 15, wherein the one or more volatile organic compounds comprises 1-hexanol.

18. The method of claim 15, wherein a combination of two or more volatile organic compounds is indicative of the presence of or response to treatment or resistance of Mycobacterium tuberculosis from the cultured sample.

19. The method of claim 15, wherein the sample is selected from the group consisting of sputum, blood, urine, pleural fluid, gastric lavage, and pleural biopsy tissue.

20. The method of claim 15, wherein the sample is sputum.

21. The method of claim 15, further comprising extracting the one or more volatile organic compounds from the culture by solid phase microextraction from a headspace of the culture or thermal desorption from a headspace of the culture to provide a more concentrated sample of the one or more volatile organic compounds for detection.

22. A method for identifying Mycobacterium tuberculosis bacteria in a sample, the method comprising:

a. collecting a sample suspected of comprising Mycobacterium tuberculosis bacteria;

b. culturing the sample using a media comprising at least two compounds selected from the group consisting of cholesterol, sodium propionate, sodium pentanoate, sodium hexanoate, and any of the foregoing compounds in isotopically labeled form; and

c. detecting one or more volatile organic compounds associated with Mycobacterium tuberculosis metabolism and indicative of a presence of or response to treatment or resistance of the Mycobacterium tuberculosis bacteria in the cultured sample.

23. A device for identifying Mycobacterium tuberculosis bacteria in a sample, the device comprising:

a. an input for receiving a sample suspected of comprising Mycobacterium tuberculosis bacteria; and

b. a means for detecting one or more volatile organic compounds indicative of a presence of or response to treatment or resistance of the Mycobacterium tuberculosis bacteria in the sample, the one or more volatile organic compounds being selected from the group consisting of ethyl propionate, 1-pentanol, methyl valerate, 1-hexanol, ethyl valerate, methyl caproate, ethyl caproate, and any of the foregoing compounds in isotopically labeled form.

24. The device of claim 23, further comprising a means for extracting one or more volatile organic compounds from the sample.

25. The device of claim 23, further comprising means for detecting one or more volatile organic compounds selected from the group consisting of methoxybenzene (anisole), 2-butanone, methyl 2-ethylhexanoate, a chiral version of methyl 2-ethylhexanoate, methyl propionate, 2-pentanone, 3-pentanone, 2,4-dimethyl-1-heptene, methyl isobutyl ketone, 6-methyl-5-hepten-2-one, dimethylsulfoxide, dimethylsulfide, 1-ethoxy-2-methylpropane, 1-ethoxybutane, t-butyl ethyl ether, isobutanol, and any of the foregoing compounds in isotopically labeled form.