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2.
Figure 4

Figure 4. From: Stable Isotope-Coded Quaternization for Comparative Quantification of Estrogen Metabolites by High-Performance Liquid Chromatography-Electrospray Ionization Mass Spectrometry.

(A) Extracted ion chromatograms of C1-NA-NHS (solid lines) and C1-NA-NHS-d3 (dashed lines) derivatives of estrogens and (B) the corresponding spectra of C1-NA-NHS and C1-NA-NHS-d3 of estrone. The LC-MS conditions were the same as those in Figure 3.

Wen-Chu Yang, et al. J Chromatogr B Analyt Technol Biomed Life Sci. ;870(2):233-240.
3.
Figure 3

Figure 3. From: Stable Isotope-Coded Quaternization for Comparative Quantification of Estrogen Metabolites by High-Performance Liquid Chromatography-Electrospray Ionization Mass Spectrometry.

(A) Extracted ion chromatograms of C1-NA-NHS derivatives of estrogens at 6.25 µg/mL, and (B) extracted ion chromatograms of dansyl-chloride derivatives of estrogens at same concentration by positive ESI-MS. The experimental conditions are described in the text. The peak numbers correspond to the structure numbers in Figure 1.

Wen-Chu Yang, et al. J Chromatogr B Analyt Technol Biomed Life Sci. ;870(2):233-240.
4.
Figure 1

Figure 1. From: Stable Isotope-Coded Quaternization for Comparative Quantification of Estrogen Metabolites by High-Performance Liquid Chromatography-Electrospray Ionization Mass Spectrometry.

Structures of the 16 estrogens studied in this work. Compound: 1. 16-epiestriol; 2. 16-keto-17β-estradiol, 3. 16α-hydroxyestrone; 4. estriol; 5. 17-epiestriol; 6. 4-hydroxyestradiol; 7. 4-hydroxyestrone; 8. 2-hydroxyestradiol; 9. 2-hydroxyestrone; 10. 17β-estradiol; 11. 4-methoxyestradiol; 12. 2-methoxyestradiol; 13. estrone; 14. 4-methoxyestrone; 15. 2-methoxyestrone; 16. 2-hydroxyestrone-3-methyl ether.

Wen-Chu Yang, et al. J Chromatogr B Analyt Technol Biomed Life Sci. ;870(2):233-240.
5.
Figure 5

Figure 5. From: Stable Isotope-Coded Quaternization for Comparative Quantification of Estrogen Metabolites by High-Performance Liquid Chromatography-Electrospray Ionization Mass Spectrometry.

Extracted ion chromatograms of C1-NA-NHS derivatized (A) pooled healthy human serum and (B) pooled breast cancer serum. The LC-MS conditions were the same as those in Figure 4 except the injection volume was 15 µL.

Wen-Chu Yang, et al. J Chromatogr B Analyt Technol Biomed Life Sci. ;870(2):233-240.

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