Method and apparatus for determining the nature of an unknown chemical substance

• US 4,365,303 A
• Filed: 02/07/1980
• Issued: 12/21/1982
• Est. Priority Date: 02/07/1980
• Status: Expired due to Term

• Current Assignee: Perkinelmer Incorporated
• Original Assignee: Perkinelmer Incorporated
• Inventors: Ford, Michael A., Coates, John P., Hannah, Robert W., Savitzky, Abraham, Carter, Harry V.
• Primary Examiner(s): Wise, Edward J.
• Application Number:
  US06/119,237
• Time in Patent Office: 1,048 Days
• Field of Search: 364/497, 364/498, 364/499, 364/200, 364/900, 364/300
• US Class Current: 702/28
• CPC Class Codes: G01J 3/28 Investigating the spectrum using colour filters G01J3/51
• CPC Class Codes: G16C 20/20 Identification of molecular entities, parts thereof or of chemical compositions

Abstract

Disclosed herein is method and apparatus for determining the nature of an unknown substance, which includes apparatus for entering a peak table of the spectrum of an unknown substance into computing apparatus, apparatus for adjusting the peak table to a first preselected standardized format, computing apparatus for comparing the so standardized peak table of the unknown with a first library of chemical structural units contained in memory in the computing apparatus, apparatus for making a list of the possible chemical structural units most closely corresponding to the unknown substance, apparatus for readjusting the peak table to a second preselected standardized format, apparatus for forming a file for the unknown substance including data corresponding to the readjusted peak table and to the list of possible chemical structural units, computing apparatus for comparing the file of the unknown substance with a second library containing files of known substances contained in memory in the computing apparatus, each known substance having a file containing data corresponding to its respective peak table in the second standardized format and to its respective chemical structural unit, and apparatus for outputting a list of known substances which most closely correspond to the unknown substance. In a form of the invention, apparatus is provided for adding data corresponding to a known substance to the second library contained in memory in the computing apparatus.

Claims

1. Apparatus for determining the nature of an unknown substance comprising, in combination:

means for entering a peak table of the spectrum of an unknown substance into computing apparatus;

means for adjusting said peak table to a first preselected standardized format;

said means for adjusting said peak table including means for deleting from the peak table all of the peaks having a transmittance greater than a preselected threshold;

means for comparing the so standardized peak table of the unknown with a first library of chemical structural units contained in memory in said computing apparatus;

means for making a list of the possible chemical structural units most closely corresponding to said unknown substance;

means for readjusting said peak table to a second preselected standardized format;

said means for readjusting said peak table including means for deleting from the peak table all peaks having a transmittance greater than a second preselected threshold;

means for forming a file for said unknown substance including data corresponding to said readjusted peak table and to said list of possible chemical structural units;

means for comparing the file of said unknown substance with a second library containing files of known substances contained in memory in said computing apparatus, each known substance having a file containing data corresponding to its respective peak table in said second standardized format and to its respective chemical structural unit; and

means for outputting a list of known substances which most closely correspond to said unknown substance.

6. Apparatus according to claim 1 or claim 3 wherein said first preselected threshold is of the order of about 95% transmittance.

7. Apparatus according to claim 1 or claim 2 or claim 3 or claim 4 wherein said step of adjusting said peak table to a first preselected standarized format includes means for correcting said peak table for a sloping baseline;

means for correcting said peak table using polystyrene or indene calibration data entered by the operator.

8. Apparatus according to claim 1 or claim 2 wherein said second preselected threshold is of the order of about 85% transmittance and said preselected range is from about 1624 to about 600 cm^-1 wavenumbers.

9. Apparatus according to any one of claims 1, 2, 3 or 4 wherein said means for entering a peak table of the spectrum of an unknown substance includes means for entering said peak table from a spectrophotometer.

10. Apparatus according to any one of claims 1, 2, 3 or 4 wherein said means for entering a peak table of the spectrum of an unknown substance includes means for manually entering said peak table using a keyboard module.

11. Apparatus according to any one of claims 1, 2, 3 or 4 wherein said means for entering a peak table of the spectrum of an unknown substance includes means for entering said peak table using a digitizer module.

12. Apparatus according to any one of claims 1, 2, 3 or 4 wherein said means for entering a peak table of the spectrum of an unknown substance includes means for entering said peak table from a microfloppy disk containing peak tables generated previously.

13. Apparatus according to any one of claims 1, 2, 3 or 4 wherein said means for forming a file for said unknown substance includes means for including data corresponding to the physical state of the unknown and data corresponding to the presence or absence of preselected non-organic elements in said unknown substance, and wherein said files of known substances in said second library contain data corresponding to the physical state of the known substances and data corresponding to the presence or absence of preselected non-organic elements in the known substances, respectively.

14. Apparatus according to claim 13 further comprising means for comparing a file of said unknown substance with the second library containing files of known substances disregarding the possible chemical structural unit data, and means for outputting a second list of known substances which most closely correspond to said unknown substance.

15. Apparatus according to claim 13 further comprising means for comparing the file of said unknown substance with the second library containing files of known substances, and means for outputting a second list of known substances the peaks of which most closely correspond to subsets of peaks of said unknown substance.

16. Appartus according to any one of claims 1, 2, 3 or 4 further comprising means for comparing the file of said unknown substance with the second library containing files of known substances disregarding the possible chemical structural unit data, and means for outputting a second list of known substances which most closely correspond to said unknown substance.

17. Apparatus according to claim 16 further comprising means for comparing the file of said unknown substance with the second library containing files of known substances, and means for outputting a third list of known substances the peaks of which most closely correspond to subsets of peaks of said unknown substance;

said apparatus further comprising means for comparing the file of said unknown substance with the second library containing files of known substances, and means for disregarding the possible chemical structural unit data, and means for outputting a fourth list of known substances the peaks of which most closely correspond to subsets of peaks of said unknown substance.

18. Apparatus according to any one of claims 1, 2, 3 or 4 further comprising means for comparing the file of said unknown substance with the second library containing files of known substances, and means for outputting a second list of known substances the peak of which most closely correspond to subsets of peaks of said unknown substance.

19. Apparatus according to any one of claims 1, 2, 3 or 4 wherein said list of known substances which most closely correspond to said unknown substance includes an indication of the degree of correspondence of said unknown substance to said known substances respectively.

2. Apparatus for determining the nature of an unknown substance comprising, in combination:

means for entering a peak table of the spectrum of an unknown substance into computing apparatus;

means for adjusting said peak table to a first preselected standardized format;

said means for adjusting said peak table including means for correcting said peak table by normalizing to preselected peaks;

means for comparing the so standarized peak table of the unknown with a first library of chemical structural units contained in memory in said computing apparatus;

means for making a list of the possible chemical structural units most closely corresponding to said unknown substance;

means for readjusting said peak table to a second preselected standarized format;

said means for readjusting said peak table including means for deleting from the peak table all peaks having a transmittance greater than a second preselected threshold;

means for forming a file for said unknown substance including data corresponding to said readjusted peak table and to said list of possible chemical structural units;

means for comparing the file of said unknown substance with a second library containing files of known substances contained in memory in said computing apparatus, each known substance having a file containing data corresponding to its respective peak table in said second standarized format and to its respective chemical structural unit; and

means for outputting a list of known substances which most closely correspond to said unknown substance.

20. Apparatus according to claim 2 or claim 4 wherein said means for adjusting said peak table to a first preselected standardized format includes means for deleting from the peak table all of the peaks having a transmittance greater than a preselected threshold.

3. Apparatus for determining the nature of an unknown substance comprising, in combination:

means for entering a peak table of the spectrum of an unknown substance into computing apparatus;

means for adjusting said peak table to a first preselected standarized format;

said means for adjusting said peak table including means for deleting from the peak table all of the peaks having a transmittance greater than a preselected threshold;

means for comparing the so standarized peak table of the unknown with a first library of chemical structural units contained in memory in said computing apparatus;

means for making a list of the possible chemical structural units most closely corresponding to said unknown substance;

means for readjusting said peak table to a second preselected standarized format;

said means for readjusting said peak table including means for restricting the range of wavenumbers in the peak table to a preselected range;

means for forming a file for said unknown substance including data corresponding to said readjusted peak table and to said list of possible chemical structural units;

means for comparing the file of said unknown substance with a second library containing files of known substances contained in memory in said computing apparatus, each known substance having a file containing data corresponding to its respective peak table in said second standardized format and to its respective chemical structural unit; and

means for outputting a list of known substances which most closely correspond to said unknown substance.

21. Apparatus according to claim 3 or claim 4 wherein said means for readjusting said peak table to a second preselected standardized format includes means for deleting from the peak table all of the peaks having a transmittance greater than a second preselected threshold.

22. Apparatus according to claim 21 wherein said means for entering a peak table of the spectrum of an unknown substance includes means for entering said peak table from a spectrophotometer.

23. Apparatus according to claim 21 wherein said means for entering a peak table of the spectrum of an unknown substance includes means for manually entering said peak table using a keyboard module.

24. Apparatus according to claim 21 wherein said means for entering a peak table of a spectrum of an unknown substance includes means for entering said peak table using a digitizer module.

25. Apparatus according to claim 21 wherein said means for entering a peak table of a spectrum of an unknown substance includes means for entering said peak table from a microfloppy disk containing peak tables generated previously.

26. Apparatus according to claim 21 wherein said means for forming a file for said unknown substance includes means for including data corresponding to the physical state of the unknown substance and data corresponding to the presence or absence of preselected non-organic elements in said unknown substance, and wherein said files of known substances in said second library contain data corresponding to the physical state of the known substance and data corresponding to the presence or absence of preselected non-organic elements in the known substances, respectively.

27. Apparatus according to claim 21 further comprising means for comparing the file of said unknown substance with the second library containing files of known substances disregarding the possible chemical structural unit data, and means for outputting a second list of known substances which most closely correspond to said unknown substance.

28. Apparatus according to claim 21 further comprising means for comparing the file of said unknown substance with the second library containing files of known substances, and means for outputting a second list of known substances, the peaks of which most closely correspond to subsets of peaks of said unknown substance.

4. Apparatus for determining the nature of an unknown substance comprising, in combination:

means for entering a peak table of the spectrum of an unknown substance into computing apparatus;

means for adjusting said peak table to a first preselected standarized format;

said means for adjusting said peak table including means for correcting said table by normalizing to preselected peaks;

means for comparing the so standarized peak table of the unknown with a first library of chemical structural units contained in memory in said computing apparatus;

means for making a list of the possible chemical structural units most closely corresponding to said unknown substance;

means for readjusting said peak table to a second preselected standarized format;

said means for readjusting said peak table including means for restricting the range of wavenumbers in the peak table to a preselected range;

means for forming a file for said unknown substance including data corresponding to said readjusted peak table and to said list of possible chemical structural units;

means for comparing the file of said unknown substance with a second library containing files of known substances contained in memory in said computing apparatus, each known substance having a file containing data corresponding to its respective peak table in said second standarized format and to its respective chemical structural unit; and

means for outputting a list of known substances which most closely correspond to said unknown substance.

5. Apparatus for adding data corresponding to a known substance to a library contained in computing apparatus memory comprising in combination:

means for entering a peak table of the spectrum of a known substance into computing apparatus;

means for adjusting said peak table to a first preselect standarized format;

said means for adjusting said peak table including means for correcting said peak table by normalizing to preselected peaks;

means for comparing the so standarized peak table of the known substance with a first library of chemical structural units contained in memory in said computing apparatus;

means for making a list of the possible chemical structural units most closely corresponding to said known substance;

means for readjusting said peak table to a second preselected standarized format;

said means for readjusting said peak table including means for restricting the range of wavenumbers in the peak table to a preselected range;

means for forming a file for said known substance including data corresponding to said readjusted peak table and to said list of possible chemical structural units, and

means for entering said file in storage in the memory of said computing apparatus.

29. Apparatus for adding data corresponding to a known substance to a library contained in computing apparatus memory comprising in combination:

means for entering a peak table of the spectrum of a known substance into computing apparatus;

means for adjusting said peak table to a first preselect standardized format;

said means for adjusting said peak table including means for deleting from the peak table all of the peaks having a transmittance greater than a preselected threshold;

means for comparing the so standardized peak table of the known substance with a first library of chemical structural units contained in memory in said computing apparatus;

means for making a list of the possible chemical structural units most closely corresponding to said known substance;

means for readjusting said peak table to a second preselected standardized format;

said means for readjusting said peak table including means for deleting from the peak table all peaks having a transmittance greater than a second preselected threshold;

means for forming a file for said known substance including data corresponding to said readjusted peak table and to said list of possible chemical structural units, and

means for entering said file in storage in the memory of said computing apparatus.

30. A method for determining the nature of an unknown substance comprising, in combination, the steps of:

entering a peak table of the spectrum of an unknown substance into computing apparatus;

adjusting said peak table to a first preselected standardized format;

said step of adjusting said peak table including a step of deleting from the peak table all of the peaks having a transmittance greater than a preselected threshold;

comparing the so standardized peak table of the unknown with a first library of chemical structural units contained in memory in said computing apparatus;

making a list of the possible chemical structural units most closely corresponding to said unknown substance;

readjusting said peak table to a second preselected standardized format;

said step of readjusting said peak table including a step of deleting from the peak table all peaks having a transmittance greater than a second preselected threshold;

forming a file for said unknown substance including data corresponding to said readjusted peak table and to said list of possible chemical structural units;

comparing the file of said unknown substance with a second library containing files of known substances contained in memory in said computing apparatus, each known substance having a file containing data corresponding to its respective peak table in said second standardized format and to its respective chemical structural unit; and

outputting a list of known substances which most closely correspond to said unknown substance.

31. A method for determining the nature of an unknown substance according to claim 30 wherein said step of adjusting said peak table further includes the step of correcting said peak table by normalizing to preselected peaks;

and said step of readjusting said peak table further includes the steps of restricting the range of wavenumbers in the peak table to a preselected range.