Assessing biodegradation of brazilian crude oils via characteristic profiles of O1 and O2 compound classes: petroleomics by negative-ion mode electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry

CAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPERJ - FUNDAÇÃO CARLOS CHAGAS FILHO DE AMPARO À PESQUISA DO ESTADO DO RIO DE JANEIROProfiles for polar heteroatom compounds were obtained via Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) using electrospray ionization (ESI) in negative-ion mode for a set of 30 Brazilian oil samples from distinct sedimentary basi31766496657CAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPERJ - FUNDAÇÃO CARLOS CHAGAS FILHO DE AMPARO À PESQUISA DO ESTADO DO RIO DE JANEIROCAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPERJ - FUNDAÇÃO CARLOS CHAGAS FILHO DE AMPARO À PESQUISA DO ESTADO DO RIO DE JANEIROsem informaçãosem informaçãosem informaçãoThis work was supported by the Laboratory of Petroleum Engineering and Exploration of the North Fluminense State University (LENEP/UENF) and the Chemistry Institute, University of Campinas (UNICAMP). CENPES/Petrobras also provided the necessary infrastru

Assessing Biodegradation of Brazilian Crude Oils via Characteristic Profiles of O₁ and O₂ Compound Classes: Petroleomics by Negative-Ion Mode Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Profiles for polar heteroatom compounds were obtained via Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) using electrospray ionization (ESI) in negative-ion mode for a set of 30 Brazilian oil samples from distinct sedimentary basins and used to estimate biodegradation extents. The samples were initially subjected to traditional geochemical biodegradation analysis to classify them in term of biodegradation levels as based on the Peters and Moldowan scale (PM scale). When the profiles were correlated with the PM scale, it was found that the O₁, N, NO₂, NO₃, and N₃O₂ classes decrease, whereas the O₂, O₃, and O₄ classes increase in relative abundance with biodegradation. The acyclic to cyclic acids (A/C) ratio of the O₂ class, mainly composed of naphthenic acids, provided a robust parameter to classify biodegradation levels of Brazilian oils. A modified saturated acid (SA) index was also used to classify biodegradation levels. For the O₁ class, two new monoaromatic (MA) indexes were proposed to predict the biodegradation extent. These MA parameters are based on the most readily degraded phenolic and/or benzylic O compounds by microorganisms and the persistence of O compounds with higher double bond equivalent (DBE) values in more degraded oils

ESI(+)-MS and GC-MS Study of the Hydrolysis of N-Azobenzyl Derivatives of Chitosan

New N-p-chloro-, N-p-bromo-, and N-p-nitrophenylazobenzylchitosan derivatives, as well as the corresponding azophenyl and azophenyl-p-sulfonic acids, were synthesized by coupling N-benzylvchitosan with aryl diazonium salts. The synthesized molecules were analyzed by UV-Vis, FT-IR, H-1-NMR and N-15-NMR spectroscopy. The capacity of copper chelation by these materials was studied by AAS. Chitosan and the derivatives were subjected to hydrolysis and the products were analyzed by ESI(+)-MS and GC-MS, confirming the formation of N-benzyl chitosan. Furthermore, the MS results indicate that a nucleophilic aromatic substitution (SnAr) reaction occurs under hydrolysis conditions, yielding chloroaniline from N-p-bromo-, and N-p-nitrophenylazo-benzylchitosan as well as bromoaniline from N-p-chloro-, and N-p-nitrophenylazobenzyl-chitosan.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES