Yamashita K - Search Results

1

Highly sensitive determination of estrone and estradiol in human serum by liquid chromatography-electrospray ionization tandem mass spectrometry.

Yamashita K, Okuyama M, Watanabe Y, Honma S, Kobayashi S, Numazawa M. Yamashita K, et al. Steroids. 2007 Oct;72(11-12):819-27. doi: 10.1016/j.steroids.2007.07.003. Epub 2007 Jul 13. Steroids. 2007. PMID: 17716700

2

Use of novel picolinoyl derivatization for simultaneous quantification of six corticosteroids by liquid chromatography-electrospray ionization tandem mass spectrometry.

Yamashita K, Takahashi M, Tsukamoto S, Numazawa M, Okuyama M, Honma S. Yamashita K, et al. J Chromatogr A. 2007 Nov 30;1173(1-2):120-8. doi: 10.1016/j.chroma.2007.10.023. Epub 2007 Oct 12. J Chromatogr A. 2007. PMID: 17964584

3

Simultaneous determination of tetrahydrocortisol, allotetrahydrocortisol and tetrahydrocortisone in human urine by liquid chromatography-electrospray ionization tandem mass spectrometry.

Yamashita K, Nakagawa R, Okuyama M, Honma S, Takahashi M, Numazawa M. Yamashita K, et al. Steroids. 2008 Aug;73(7):727-37. doi: 10.1016/j.steroids.2008.02.009. Epub 2008 Feb 26. Steroids. 2008. PMID: 18394666

4

Preparation and structural elucidation of the picolinyl ester of aldosterone for liquid chromatography-electrospray ionization tandem mass spectrometry.

Yamashita K, Tadokoro Y, Takahashi M, Numazawa M. Yamashita K, et al. Chem Pharm Bull (Tokyo). 2008 Jun;56(6):873-7. doi: 10.1248/cpb.56.873. Chem Pharm Bull (Tokyo). 2008. PMID: 18520101 Free article.

5

Development of sensitive derivatization method for aldosterone in liquid chromatography-electrospray ionization tandem mass spectrometry of corticosteroids.

Yamashita K, Okuyama M, Nakagawa R, Honma S, Satoh F, Morimoto R, Ito S, Takahashi M, Numazawa M. Yamashita K, et al. J Chromatogr A. 2008 Jul 25;1200(2):114-21. doi: 10.1016/j.chroma.2008.05.034. Epub 2008 May 22. J Chromatogr A. 2008. PMID: 18561939

6

Chemical aromatization of 19-hydroxyandrosta-1,4-diene-3,17-dione with acid or alkaline: elimination of the 19-hydroxymethyl group as formaldehyde.

Numazawa M, Yamashita K, Kimura N, Takahashi M. Numazawa M, et al. Among authors: yamashita k. Steroids. 2009 Feb;74(2):208-11. doi: 10.1016/j.steroids.2008.10.011. Epub 2008 Oct 30. Steroids. 2009. PMID: 19022274

7

Development of highly sensitive quantification method for testosterone and dihydrotestosterone in human serum and prostate tissue by liquid chromatography-electrospray ionization tandem mass spectrometry.

Yamashita K, Miyashiro Y, Maekubo H, Okuyama M, Honma S, Takahashi M, Numazawa M. Yamashita K, et al. Steroids. 2009 Nov;74(12):920-6. doi: 10.1016/j.steroids.2009.06.007. Epub 2009 Jul 2. Steroids. 2009. PMID: 19576916

8

Fusaric acid as a novel proton-affinitive derivatizing reagent for highly sensitive quantification of hydroxysteroids by LC-ESI-MS/MS.

Yamashita K, Yamazaki K, Komatsu S, Numazawa M. Yamashita K, et al. J Am Soc Mass Spectrom. 2010 Feb;21(2):249-53. doi: 10.1016/j.jasms.2009.10.008. Epub 2009 Nov 14. J Am Soc Mass Spectrom. 2010. PMID: 19914845 Free article.

9

Assay of labile estrogen o-quinones, potent carcinogenic molecular species, by high performance liquid chromatography-electrospray ionization tandem mass spectrometry with phenazine derivatization.

Yamashita K, Masuda A, Hoshino Y, Komatsu S, Numazawa M. Yamashita K, et al. J Steroid Biochem Mol Biol. 2010 Apr;119(3-5):141-8. doi: 10.1016/j.jsbmb.2010.02.016. Epub 2010 Feb 25. J Steroid Biochem Mol Biol. 2010. PMID: 20188833

10

Synthesis of pyridine-carboxylate derivatives of hydroxysteroids for liquid chromatography-electrospray ionization-mass spectrometry.

Yamashita K, Kobayashi S, Tsukamoto S, Numazawa M. Yamashita K, et al. Steroids. 2007 Jan;72(1):50-9. doi: 10.1016/j.steroids.2006.10.005. Epub 2006 Dec 1. Steroids. 2007. PMID: 17141289

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