𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Investigation of some 2,3-didehydro amino acids by fast ion bombardment, chemical ionization and mass-selected collision-induced dissociation mass spectrometry

✍ Scribed by M. Hamdan; G. Tarzia; C. Balsamini; A. Bedim

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
504 KB
Volume
27
Category
Article
ISSN
1076-5174

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Four 2,3‐didehydro amino acids were investigated by fast ion bombardment (FIB) and ammonia chemical ionization (NH~3~‐CI) mass Spectrometry. The protonated molecules formed by the two techniques were mass selected and their respective collision‐induced dissociations (CIDs) in the translational energy range 5–200 eV (in the laboratory frame of reference) were investigated. No obvious quantitative differences between the FIB and NH~3~‐CI mass spectra of the (E)‐ and (Z)‐isomers were observed. Different internal excitation of the protonated molecules formed by the two techniques and the role of CID data in clarifying this particular observation are discussed.

📜 SIMILAR VOLUMES

Positive-ion mass spectra and collision-
Positive-ion mass spectra and collision-induced dissociation of some 2,3-didehydro amino acids
✍ Mahmoud Hamdan; Giorgio Tarzia; Cesarino Balsamini; Gilberto Spadoni; Ornella Cu 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 590 KB

## Abstract The positive‐ion mass spectra of a number of didehydro amino acids, ionized by electron impact and/or thermospray, and collision‐induced dissociation spectra taken at collision energies of a few electron volts and keV have been performed on multiple quadrupole and reversed geometry sect

Investigation of some pentasubstituted 1
Investigation of some pentasubstituted 1,4-dihydropyridines by means of fast ion bombardment, chemical ionization and electron impact mass spectrometry
✍ M. Hamdan; M. Scandola; G. Tarzia 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 424 KB

## Abstract Positive fast ion bombardment, positive chemical ionization (CI^+^) and positive electron impact (EI) ionization mass spectrometry were used to investigate a number of relatively large and structurally related organic molecules. Some of the major dissociation pathways observed in the CH

Electron impact, chemical ionization and
Electron impact, chemical ionization and negative chemical ionization mass spectra, and mass-analysed ion kinetic energy spectrometry–collision-induced dissociation fragmentation pathways of some deuterated 2,4,6-trinitrotoluene (TNT) derivatives
✍ Jehuda Yinon; Daniel Fraisse; Ian J. Dagley 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 489 KB

Mass-analysed ion kinetic energy spectrometry (MIKES) with collision-induced dissociation (CID) has been used to study the fragmentation processes of a series of deuterated 2,4,6-trinitrotoluene (TNT) and deuterated 2,4,6trinitrobenzylchloride (TNTCI) derivatives. Typical fragment ions observed in b

Analysis of Bile Acids and Bile Alcohols
Analysis of Bile Acids and Bile Alcohols in Urine by Capillary Column Liquid Chromatography–Mass Spectrometry using Fast Atom Bombardment or Electrospray Ionization and Collision-induced Dissociation
✍ Y. Yang; W. J. Griffiths; H. Nazer; J. Sjövall 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 329 KB 👁 2 views

Solid-phase extraction and group separation by anion exchange chromatography were combined with capillary column liquid chromatography-mass spectrometry (LC/MS) to permit a thorough characterization of bile acids and intact conjugates of bile alcohols in human urine. Groups of compounds were separat

Investigation of lacidipine, a new 1,4-d
Investigation of lacidipine, a new 1,4-dihydropyridine antihypertensive agent and three chemically related compounds by means of chemical ionization, mass spectrometry and collision-induced dissociation
✍ M. Harridan; M. Scandola; D. Franchi; G. Gaviraghi; G. Tarzia 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 813 KB

Chemical ionization of two 1,4dihydropyridines, lacidipine and its Z-isomer, and their corresponding pyridines in three different reagent gases and the collision-induced dissociation (CID) of their respective mass-selected protonated molecular ions in the collision energy range 1&200 eV were perform