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- W2009969685 abstract "Petroporphyrins were purified via thin-layer chromatography (TLC) and were de-metallized with p-toluenesulfonic acid after being isolated from crude oil and source rocks of the Liaohe Basin by dry column chromatography. Analysis of de-metallized petroporphyrins by electron ionization mass spectrometry (EIMS) identified the porphyrin classes present and their carbon number ranges, but the spectra were extremely complex. Many fragmental ions were observed for each porphyrin in addition to the molecular ion, and little data on the structure of the individual components were found. To correlate the fragmental ions with their molecular ions and gain more information about the structure and fragmentation of petroporphyrins, MS/MS can be employed. Tandem mass spectrometry (MS/MS) allowed selection of the molecular ions of individual carbon number porphyrins of the DPEP and ETIO types for fragmentation by collision activated dissociation (CAD). Comparison of their daughter spectra with those of porphyrin standards provided the first structural information on individual petroporphyrins. According to the information, the author suggests a method for calculating individual carbon number porphyrin isomers on the basis of quantitative analysis for the nature of petroporphyrins' pyrole-alkyl substituents. This method is useful for the study of the detailed structure of petroporphyrins." @default.
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- W2009969685 date "1991-01-01" @default.
- W2009969685 modified "2023-09-25" @default.
- W2009969685 title "Application of MS/MS technique to the structure study of petroporphyrins" @default.
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- W2009969685 doi "https://doi.org/10.1016/0743-9547(91)90005-i" @default.
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