scholarly journals Synthesis and Mass Spectral Fragmentation Patterns of Brassinolide Early Biosynthetic Precursors Labeled at C-26

2013 ◽  
Vol 8 (6) ◽  
pp. 1934578X1300800
Author(s):  
Vladimir A. Khripach ◽  
Danuše Tarkowská ◽  
Vladimir N. Zhabinskii ◽  
Olga V. Gulyakevich ◽  
Yurii V. Ermolovich ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Mass Spectrometric ◽  
Keto Group ◽  
Liquid Chromatography Mass Spectrometry ◽  
Mass Spectral Fragmentation ◽  
Mass Spectral ◽  
Fragmentation Patterns ◽  
Natural Brassinosteroids ◽  
Mass Spectrometric Behavior

New analogues of brassinolide biosynthetic precursors with three deuterium atoms at non-exchangeable positions have been synthesized to be used as standards for quantification of natural brassinosteroids by liquid chromatography-mass spectrometry. [26-2H3](22 R,23 R,24 S)-22,23-Dihydroxy-6β-methoxy-24-methyl-3α,5-cyclo-5α-cholestane was used as a starting material for the preparation of campestane derivatives having a 22 R,23 R-diol functionality and either a hydroxy or keto group at C-3 and labeled at C-26. The mass spectrometric behavior of the newly synthesized compounds has been studied.

Massenspektrometrische Fragmentierung von Trimethylsilylderivaten (TMS) des Thyrotropin-„Releasing“-Hormons (TRH) und dessen Teilstrukturen / Mass Spectroscopy of Trimethylsilyl Derivatives of Thyrotropin-releasing Hormone and its Constituents

1973 ◽  
Vol 28 (11-12) ◽  
pp. 820-823 ◽  
Author(s):  
W. A. König ◽  
S. Fuchs ◽  
K. Zech ◽  
W. Voelter
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectroscopy ◽  
Peptide Hormones ◽  
Thyrotropin Releasing Hormone ◽  
Mass Spectral Fragmentation ◽  
Releasing Hormone ◽  
Mass Spectral ◽  
Trimethylsilyl Derivatives ◽  
Fragmentation Patterns ◽  
Derivatives Of

The mass spectral fragmentation patterns of trimethylsilyl derivatives of TRH and its constituents are discussed. The utility of these derivatives for the control of the synthesis of peptide hormones by mass spectrometry is obvious.

scholarly journals Mass Spectrometric Studies of Dehydro-α-lapachone and Dehydro-iso-α-lapachone

1973 ◽  
Vol 28 (11-12) ◽  
pp. 646-649 ◽  
Author(s):  
Krishna C. Joshi ◽  
Lalit Prakash ◽  
R. K. Bansal ◽  
Pahup Singh
Keyword(s):  
Mass Spectrometric ◽  
Mass Spectral Fragmentation ◽  
Mass Spectral ◽  
Tabebuia Rosea ◽  
Fragmentation Patterns

Abstract Mass spectral fragmentation studies of dehydro-a-lapachone and dehydro-iso-a-lapadione, isolated from the heartwood of Tabebuia rosea, have been made. The fragmentation patterns in the case of two compounds are essentially similar and have been discussed

Fragmentation Patterns of Aromatic 2,5-diketopiperazines Using Liquid chromatography/Mass Spectrometry

2016 ◽  
Vol 12 (5) ◽  
pp. 439-449 ◽  
Author(s):  
Sotirios M. Bratakos ◽  
Vassilia J. Sinanoglou ◽  
Minos T. Matsoukas ◽  
Eleni Siapi ◽  
Demetris P. Papahatjis ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Liquid Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Fragmentation Patterns
Sign in / Sign up

Export Citation Format

Share Document