Methods for detecting estrone by mass spectrometry

10422,804

15/616657

June 07, 2017

Provided are methods for determining the amount of estrone in a sample using mass spectrometry. The methods generally involve ionizing estrone in a sample and detecting and quantifying the amount of the ion to determine the amount of estrone in the sample.

Quest Diagnostics Investments Incorporated (Wilmington, DE, US)

Quest Diagnostics Investments Incorporated (Wilmington, DE, US)

1. A method for determining the amount of estrone in a sample, said method comprising: (a) adding deuterated estrone to a sample; (b) derivatizing estrone to produce a derivative of estrone; (c) purifying the sample by high performance liquid chromatography (HPLC); (d) ionizing the derivative of estrone and deuterated estrone in said sample with electrospray ionization (ESI) in positive ion mode to produce one or more ions detectable by mass spectrometry; (e) detecting the amount of the ions by tandem mass spectrometry; and (f) comparing the amount of said one or more ions of estrone and said one or more ions of deuterated estrone to determine the amount of estrone in the sample.

2. The method of claim 1 , wherein said deuterated estrone is d 4 -estrone.

3. The method of claim 1 , wherein said deuterated estrone is 2,4,16,16-d 4 estrone.

4. The method of claim 1 , wherein said method further comprises subjecting estrone from said sample to an extraction.

5. The method of claim 1 , wherein said method has a limit of quantitation less than or equal to 20 pg/mL.

6. The method of claim 1 , wherein said method has a limit of detection less than or equal to 10 pg/mL.

7. The method of claim 1 , wherein said sample is a human plasma or serum sample.

8. A method for determining the amount of estrone in a sample, said method comprising: (a) adding deuterated estrone to a sample; (b) derivatizing estrone to produce a derivative of estrone; (c) purifying the sample by liquid chromatography; (d) ionizing derivatized estrone and deuterated estrone in said sample with electrospray ionization (ESI) in positive ion mode to produce one or more ions detectable by mass spectrometry; (e) detecting the amount of the ions by tandem mass spectrometry; and (f) comparing the amount of said one or more ions of estrone and said one or more ions of deuterated estrone to determine the amount of estrone in the sample.

9. The method of claim 8 , wherein said liquid chromatography comprises high turbulence liquid chromatography (HTLC).

10. The method of claim 8 , wherein said liquid chromatography comprises high performance liquid chromatography (HPLC).

11. The method of claim 8 , wherein said deuterated estrone is d 4 -estrone.

12. The method of claim 8 , wherein said deuterated estrone is 2,4,16,16-d 4 estrone.

13. The method of claim 8 , wherein said method further comprises subjecting estrone from said sample to an extraction.

14. The method of claim 8 , wherein said method has a limit of quantitation less than or equal to 20 pg/mL.

15. The method of claim 8 , wherein said method has a limit of detection less than or equal to 10 pg/mL.

16. The method of claim 8 , wherein said sample is a human plasma or serum sample.

17. A method for determining the amount of estrone in a sample, said method comprising: (a) adding deuterated estrone to a sample; (b) derivatizing estrone to produce a derivative of estrone; (c) ionizing derivatized estrone and deuterated estrone in said sample with electrospray ionization (ESI) in positive ion mode to produce one or more ions detectable by mass spectrometry; (e) detecting the amount of the ions by tandem mass spectrometry; and (e) comparing the amount of said one or more ions of estrone and said one or more ions of deuterated estrone to determine the amount of estrone in the sample.

18. The method of claim 17 , wherein said deuterated estrone is d 4 -estrone.

19. The method of claim 17 , wherein said deuterated estrone is 2,4,16,16-d 4 estrone.

20. The method of claim 17 , wherein said method further comprises subjecting estrone from said sample to an extraction.

21. The method of claim 17 , wherein said method has a limit of quantitation less than or equal to 20 pg/mL.

22. The method of claim 17 , wherein said method has a limit of detection less than or equal to 10 pg/mL.

23. The method of claim 17 , wherein said sample is a human plasma or serum sample.

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