Helmy R - Search Results

1

Characterization of impurities of HIV NNRTI Doravirine by UHPLC-high resolution MS and tandem MS analysis.

Zhang LK, Yang R, Sheng H, Helmy R, Zheng J, Cao Y, Gauthier DR Jr. Zhang LK, et al. Among authors: helmy r. J Mass Spectrom. 2016 Oct;51(10):959-968. doi: 10.1002/jms.3807. J Mass Spectrom. 2016. PMID: 27383410

2

Identification of a trace colored impurity in drug substance by preparative liquid chromatography and mass spectrometry.

Wang P, Shi YJ, Helmy R, Reamer R, Vailaya A. Wang P, et al. Among authors: helmy r. Rapid Commun Mass Spectrom. 2005;19(24):3749-54. doi: 10.1002/rcm.2261. Rapid Commun Mass Spectrom. 2005. PMID: 16308847

3

Design and application of an easy to use oligonucleotide mass calculation program.

Yang J, Leopold P, Helmy R, Parish C, Arvary B, Mao B, Meng F. Yang J, et al. Among authors: helmy r. J Am Soc Mass Spectrom. 2013 Aug;24(8):1315-8. doi: 10.1007/s13361-013-0643-8. Epub 2013 Jun 6. J Am Soc Mass Spectrom. 2013. PMID: 23740032

4

Online Investigation of Aqueous-Phase Electrochemical Reactions by Desorption Electrospray Ionization Mass Spectrometry.

Lu M, Liu Y, Helmy R, Martin GE, Dewald HD, Chen H. Lu M, et al. Among authors: helmy r. J Am Soc Mass Spectrom. 2015 Oct;26(10):1676-85. doi: 10.1007/s13361-015-1210-2. Epub 2015 Aug 5. J Am Soc Mass Spectrom. 2015. PMID: 26242804

5

Integration of electrochemistry with ultra-performance liquid chromatography/mass spectrometry.

Cai Y, Zheng Q, Liu Y, Helmy R, Loo JA, Chen H. Cai Y, et al. Among authors: helmy r. Eur J Mass Spectrom (Chichester). 2015;21(3):341-51. doi: 10.1255/ejms.1318. Eur J Mass Spectrom (Chichester). 2015. PMID: 26307715 Free PMC article.

6

A novel compact mass detection platform for the open access (OA) environment in drug discovery and early development.

Gao J, Ceglia SS, Jones MD, Simeone J, Antwerp JV, Zhang LK, Ross CW 3rd, Helmy R. Gao J, et al. Among authors: helmy r. J Pharm Biomed Anal. 2016 Apr 15;122:1-8. doi: 10.1016/j.jpba.2016.01.017. Epub 2016 Jan 15. J Pharm Biomed Anal. 2016. PMID: 26821286

7

Synthesis of [(14) C]omarigliptin.

Ren S, Gauthier D, Marques R, Helmy R, Hesk D. Ren S, et al. Among authors: helmy r. J Labelled Comp Radiopharm. 2016 Aug;59(10):386-90. doi: 10.1002/jlcr.3421. Epub 2016 Jun 23. J Labelled Comp Radiopharm. 2016. PMID: 27334864

8

Mechanistic Study of the Gas-Phase In-Source Hofmann Elimination of Doubly Quaternized Cinchona-Alkaloid Based Phase-Transfer Catalysts by (+)-Electrospray Ionization/Tandem Mass Spectrometry.

Yang RS, Sheng H, Lexa KW, Sherer EC, Zhang LK, Xiang B, Helmy R, Mao B. Yang RS, et al. Among authors: helmy r. J Am Soc Mass Spectrom. 2017 Mar;28(3):452-460. doi: 10.1007/s13361-016-1583-x. Epub 2017 Jan 18. J Am Soc Mass Spectrom. 2017. PMID: 28101849

9

Unusual (+/-)-electrospray ionization induced fragmentation: Structural elucidation of an in-process synthetic intermediate of doravirine (MK-1439) using liquid chromatography/high-resolution tandem mass spectrometry and two-dimensional nuclear magnetic resonance.

Sheng H, Lexa KW, Zhang LK, Yang RS, Wright TJ, Sherry BD, Helmy R, Martin GE. Sheng H, et al. Among authors: helmy r. Rapid Commun Mass Spectrom. 2017 Apr 30;31(8):719-727. doi: 10.1002/rcm.7833. Rapid Commun Mass Spectrom. 2017. PMID: 28171682

10

Development of a highly efficient decontamination approach for ceftolozane in the pharmaceutical manufacturing environment.

Yang RS, Zhang LK, Helmy R, Andreani T, Liu Z, Sheng H. Yang RS, et al. Among authors: helmy r. J Pharm Biomed Anal. 2020 Jan 5;177:112846. doi: 10.1016/j.jpba.2019.112846. Epub 2019 Aug 29. J Pharm Biomed Anal. 2020. PMID: 31522097

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