Chemical ionization mass spectrometry with amines as reactant gases. II—amine chemical ionization mass spectrometry of diene valepotriates

Mollova, Nevena; Handjieva, Nedjalka; Попов, Симеон

doi:10.1002/bms.1200130402

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A [M -H]1

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1999

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Cited by 6 publications

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“…There are some peculiarities in the spectra with TEA. In some other cases, for example valepotriates, 12 TEA also produced some peculiar spectra, which are very different from the spectra with other aliphatic amines. Probably, the relatively large effective molecular volume of TEA affected the formation of protonated molecular ion and thus changed the fragmentation.…”

Section: A [M -H]mentioning

confidence: 71%

Stereo effects in the chemical ionization mass spectrometry of galanthamine epimers

Christov¹,

Bankova²,

Elenkov³

et al. 1999

Eur. J. Mass Spectrom.

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Galanthamine and 2-epigalanthamine possess similar electron impact mass spectra (EI-MS), while their chemical ionization (CI) mass spectra with isobutane, acetone and diethyl ether as reagent gas show significant differences in the relative intensities of [M + H] + and [M + H-H 2 O] + ions. Ionization with amines indicates lower basicity of galanthamine, compared with its epimer. Two modifications of a method for determination of the ratio galanthamine to 2-epigalanthamine in mixtures were developed.

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Section: A [M -H]mentioning

confidence: 71%