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Titolo:
GEOPORPHYRIN ANALYSIS USING ELECTROSPRAY IONIZATION MASS-SPECTROMETRY
Autore:
VANBERKEL GJ; QUINONES MA; QUIRKE JME;
Indirizzi:
OAK RIDGE NATL LAB,DIV ANALYT CHEM OAK RIDGE TN 37831 FLORIDA INT UNIV,DEPT CHEM MIAMI FL 33199
Titolo Testata:
Energy & fuels
fascicolo: 3, volume: 7, anno: 1993,
pagine: 411 - 419
SICI:
0887-0624(1993)7:3<411:GAUEIM>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
CAPILLARY ZONE ELECTROPHORESIS; AMMONIA CHEMICAL IONIZATION; CARBON-NUMBER GEOPORPHYRINS; ION-TRAP; STEREOCHEMICAL PROBLEMS; SUBSTITUTED PORPHYRINS; HENRYVILLE BED; ALBANY SHALE; BIOMOLECULES; TETRAPYRROLES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
51
Recensione:
Indirizzi per estratti:
Citazione:
G.J. Vanberkel et al., "GEOPORPHYRIN ANALYSIS USING ELECTROSPRAY IONIZATION MASS-SPECTROMETRY", Energy & fuels, 7(3), 1993, pp. 411-419

Abstract

The utility of electrospray ionization combined with mass spectrometry (ES-MS) for the analysis of free-base, nickel and vanadyl geoporphyrins is demonstrated. In positive ion mode, free-base alkyl-substitutedporphyrins are detected as the protonated molecule, (M + H)+, while the nickel and vanadyl chelates of these same porphyrins are observed as their radical cations, M.+, as is chlorophyll a. Detection of free-base octaethylporphyrin (OEP) using continuous infusion at 1-5 muL/min required sampling as little as 1 fmol of material, while at these sameflow rates 18 fmol of OEP could be detected via flow injection. Detection of 500 fmol of mesoporphyrin IX dimethyl ester injected is demonstrated using on-line reverse-phase microbore-HPLC at a solvent flow rate of 40 muL/min. ES-MS is shown to be well-suited for geoporphyrin molecular weight and carbon number determination since no fragment ions are produced by this ionization process. Accuracy in determining the relative abundances of porphyrins within geoporphyrin mixtures is demonstrated using standard solutions containing known molar ratios of OEP and free-base etioporphyrin-III (etio-III) and a total free-base porphyrin mixture isolated from Gilsonite bitumen. On-line separation/mass spectrometric detection of free-base and nickel geoporphyrin mixtures using reverse-phase microbore-HPLC/ES/MS is demonstrated with Gilsonite porphyrins.

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Documento generato il 18/09/20 alle ore 11:02:27