Mass spectrometry of sterols. Electron ionization induced fragmentation of C-4-alkylated cholesterols

Knapp, F.F.; Schroepfer, George J.

doi:10.1016/0009-3084(76)90048-7

Cited by 22 publications

(2 citation statements)

References 38 publications

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“…The maximum detectable masses of the campesteryl and stigmasteryl acetates were less than that of the molecular ion by 60 mass units, indicating that they lost one molecule of acetate. Other fragment ions of the steryl acetates remain consistent with the description in the literature concerning the electron impact mass spectra of steryl esters. − …”

Section: Resultssupporting

confidence: 86%

Novel Synthesis of Steryl Esters from Phytosterols and Amino Acid

Pang

Jiang

Cao

et al. 2011

J. Agric. Food Chem.

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The feasibility of esterification of phytosterol with the amino acid l-glutamic acid was established. The influence of various organic solvents was investigated, and n-butanol was selected as an ideal solvent for phytosteryl esters synthesis with l-glutamic acid. The reaction conditions were further optimized by orthogonal experiments, and a 92.3% degree of esterification was obtained when optimum conditions were used. FT-IR spectral, GC-MS, and NMR analyses were adopted to determine the steryl esters of l-glutamic acid. The FT-IR spectrum indicated the presence of ester bonds in the phytosteryl esters with l-glutamic acid, and on the basis of the detailed mass spectrography analysis, GC-MS and NMR offered an efficient and reliable way to confirm the steryl esters. This novel synthesis approach of phytosteryl esters with amino acid supplied a promising alternative to the substrate on esterification of phytosterols and thus can be readily applied to further studies of functional food ingredients of phytosteryl esters.

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Section: Resultssupporting

confidence: 86%

Novel Synthesis of Steryl Esters from Phytosterols and Amino Acid

Pang

Jiang

Cao

et al. 2011

J. Agric. Food Chem.

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show abstract

“…The purpose of the present work is to identify the characteristic fragment ions of several COPs through comparison of their mass spectra and applications of general fragmentation rules, in order to predict the appearance of mass spectra of new sterol derivatives and to permit their identification when appropriate standards are not available. In that connection it is important to emphasize that similar attempts to systematise mass spectral fragments of sterol compounds were not found in the literature, with the exception of some rather specific applications 16–19…”

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confidence: 99%