Method for analysis of pathogenic microorganisms using raman spectroscopic techniques

• US 8,395,769 B2
• Filed: 07/12/2010
• Issued: 03/12/2013
• Est. Priority Date: 01/10/2002
• Status: Active Grant

• Current Assignee: Chemimage Corporation
• Original Assignee: Chemimage Corporation
• Inventors: Stewart, Shona, Maier, John, Treado, Patrick
• Primary Examiner(s): NGUYEN, SANG H
• Application Number:
  US12/834,462
• Publication Number:
  US 20110007309A1
• Time in Patent Office: 974 Days
• Field of Search: 356/301, 435/6, 435/7.92, 435/91.2
• US Class Current: 356/301
• CPC Class Codes: G01J 3/2823 Imaging spectrometer
• CPC Class Codes: G01J 3/44 Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
• CPC Class Codes: G01N 21/65 Raman scattering
• CPC Class Codes: G01N 21/658 enhancement Raman, e.g. surface plasmons
• CPC Class Codes: G01N 33/1826 Organic contamination in water

Abstract

A method for assessing the presence of a pathogenic microorganism in a sample. A sample is illuminated to thereby produce a first plurality of interacted photons which may be scattered, emitted, reflected and/or absorbed by the sample. The first plurality of interacted photons are assessed to thereby generate a Raman data set representative of the sample. This Raman data set is analyzed to thereby determine at least one of: the presence of a pathogenic microorganism in said sample and the absence of a pathogenic microorganism in said sample. The Raman data set may comprise at least one of a Raman spectrum and/or a Raman chemical image representative of the sample. The analysis may comprise comparing said Raman data set to at least one reference Raman data set representative of a known sample. This may be achieved using a chemometric technique.

Claims

1. A method comprising:

illuminating a sample using wide-field illumination to thereby produce a first plurality of interacted photons;

assessing the first plurality of interacted photons using a spectroscopic device to thereby generate a Raman data set representative of the sample;

analyzing the Raman data set using a computer to determine at least one of;

the presence of a pathogenic microorganism in the sample and the absence of a pathogenic microorganism in the sample.

2. The method of claim 1 wherein the Raman data set comprises at least one of:

a Raman spectrum representative of the sample, a Raman chemical image representative of the sample, and combinations thereof.

3. The method of claim 2 wherein the Raman chemical image comprises a hyperspectral image comprising an image and a fully resolved spectrum unique to the material for each pixel location in the image.

4. The method of claim 2 further comprising fusing the Raman chemical image with a visible microscopic image representative of the sample.

5. The method of claim 1 wherein the analyzing comprises comparing the Raman data set to at least one reference Raman data set representative of a known sample.

6. The method of claim 5 wherein the comparing is achieved using a chemometric technique.

7. The method of claim 1 wherein the pathogen comprises a human pathogen.

8. The method of claim 1 wherein the pathogen comprises a protozoan.

9. The method of claim 1 wherein the pathogen comprises at least one of:

fungi, yeast, mold, virus, biological toxin, and combinations thereof.

10. The method of claim 1 wherein the pathogen comprises a bacterium.

11. the method of claim 10 wherein the bacterium comprises at least one of:

Escherichia, Yersinia, Francisella, Brucella, Clostridium, Burkholderia, Chlamydia, Coxiella, Rickettsia, Vibrio, Enterococcus, Staphylococcus, Staphylococcus, Enterobacter, Corynebacterium, Pseudomonas, Acinetobacter, Klebsiella, Serratia, and combinations thereof.

12. The method of claim 10 wherein the bacterium comprises at least one of:

methicillin resistant staphylococcus aureus, methicillin sensitive staphyloccus aureus, and combinations thereof.

13. The method of claim 10 wherein the bacterium comprises at least one of:

proteus mirabilis, pseudomonas non-aeruginosa, propionibacterium acnes, listeria monocytogenes, neisseria meningitides, streptococcus pneumoniae, salmonella, and combinations thereof.

14. The method of claim 10 wherein the bacterium comprises haemophilus influenzae type b.

15. The method of claim 10 wherein the bacterium comprises group b streptococcus.

16. The method of claim 1 wherein the pathogen comprises at least one of:

cryptosporidium parvum, cryptosporidium muris, cryptosporidium meleagridis, cryptosporidium wrairi, cryptosporidium felis, cryptosporidium serpentis, cryptosporidium nasorum, cryptosporidium baileyi, cryptosporidium sarophilum, cryptosporidium canis, cryptosporidium adnersoni, and combinations thereof.

17. The method of claim 1 wherein the pathogen comprises giardia.

18. The method of claim 1 wherein the pathogen comprises at least one of:

Escherichia coli, Yersinia pestis, Francisella tularensis, Clostridium perfringens, Burkholderia mallei, Burkholderia pseudomallei, Chlamydia psittaci, Coxiella burnetii, Rickettsia prowazekii, Vibrio vulnificus, Vibrio enterolyticus, Vibrio fischii, Vibrio cholera, Enterococcus faecalis, Staphylococcus epidermidis, Staphylococcus aureus, Enterobacter aerogenes, Corynebacterium diphtheriae, Pseudomonas aeruginosa, Acinetobacter calcoaceticus, Klebsiella pneurnoniae, Serratia marcescens, Candida albicans, and combinations thereof.

19. The method of claim 1 wherein the pathogen comprises at least one of:

a filovirus, a navirus, a rotovirus, calcivirus, a hepatitis virus, and combinations thereof.

20. The method of claim 1 wherein the pathogen comprises coagulase-negative staphylococci.

21. The method of claim 1 further comprising:

identifying a region of the sample comprising the pathogenic microorganism; and

manipulating the region.

22. The method of claim 21 wherein the manipulating comprises ablation.

23. The method of claim 1 further comprising passing the first plurality of interacted photons through a filter wherein the filter comprises at least one of:

Fabry Perot angle tuned filter, an acousto-optic tunable filter, a liquid crystal tunable filter, a Lyot filter, an Evan'"'"'s split element liquid crystal tunable filter, Solc liquid crystal tunable filter, a liquid crystal Fabry Perot (LCFP) tunable filter, a multi-conjugate tunable filter, and combinations thereof.