The magnesium, nickel, copper, zinc and vanadium metalloporphyrins from octaethylporphyrin, etioporphyrin I and tetraphenylporphyrin were characterized using electrospray ionization mass spectrometry (ESI-MS). The ion abundance of each of the porphyrins present in binary mixtures was monitored as a
Hydrogen chemical ionization mass spectrometry of metalloporphyrins
β Scribed by Richard P. Evershed; George A. Wolff; Graham J. Shaw; Geoffrey Eglinton
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- English
- Weight
- 804 KB
- Volume
- 20
- Category
- Article
- ISSN
- 1076-5174
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The hydrogen and isobutane chemical ionization mass spectra of a number of carotenoids, with symmetrical and unsymmetrical end groups, have been examined. Similar spectra were obtained with each gas. Loss of fragments, characteristic of both the polyene chain and of the end groups were shown by all
## Abstract The uses of dimethyl ether (DME) as an unusual positive ion reagent for chemical ionization mass spectrometry (CIMS) are reviewed. The fragmentβmolecule adducts formed by ionβmolecule reactions of organic substrates with the ionized gas are highly characteristic for the substrates and f