Caracterização espectroscópica de líquen parmotrema tinctorum

Detalhes bibliográficos
Autor(a) principal: Oliveira, Luiz Fernando Cappa de
Data de Publicação: 2008
Outros Autores: Pinto, Plínio César de Carvalho
Tipo de documento: Artigo de conferência
Idioma: por
Título da fonte: Repositório Institucional da UFJF
Texto Completo: https://repositorio.ufjf.br/jspui/handle/ufjf/9488
Resumo: -
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spelling 2019-03-29T15:27:02Z2019-03-152019-03-29T15:27:02Z2008XIVhttps://repositorio.ufjf.br/jspui/handle/ufjf/9488-FT-Raman spectroscopy has been used for the analytical characterization of the Parmotrema tinctorum Del. Ex Nyl. lichen. Lecanoric acid, the major lichen chemical present in the total mass, has been extracted from the lichen, purified and characterized by Raman spectroscopy supported by means of theoretical DFT calculations . The calculations indicate that the aromatic ring A of the lecanoric acid structure is kept in the molecular plane by a strong hydrogen bond between the ortho- hydroxyl group of ring A and the ester group; this hydrogen bond is shorter in the C1 isomer form, which is the main feature responsible for the Gibbs free energy difference (-2.96 kcal/mol) favouring the C1 isomer. In spite of the similarity of possible conformers and although many of the predicted Raman bands are found to be common for both forms, there is one Raman transition very characteristic of structure C2, centred at 1815 cm-1, assigned to the stretching of the C=O group of the ester moiety. For the isomer C1 this transition was predicted at 1729 cm-1, with a lower frequency ascribed to the stronger hydrogen bond present in the latter conformation. In the experimental spectrum two strong bands are found at 1654 and 1638 cm-1 (shoulder) attributed to the C=O stretching mode. The analysis of the normal modes for the corresponding transitions calculated at 1742 and 1729 cm-1 allowed the assignment to be made to (C=O) stretching mode from the carboxylic acid and ester moiety, respectively. Most of the other Raman bands were also assigned by comparison with the theoretical model. The Raman spectrum obtained directly from the P. tinctorum lichen shows a remarkable similarity with the isolated lecanoric acid spectrum, as well as the presence of bands at 1529 and 1156 cm-1 which are characteristic of a carotenoid species. The results confirm the potential of Raman spectroscopy for taxonomic characterization of lichen species.porUniversidade Federal de Juiz de Fora (UFJF)UFJFBrasilXIV Seminário de Iniciação Científica / IV Seminário de Iniciação Científica Jr.CNPQ::ENGENHARIAS-Caracterização espectroscópica de líquen parmotrema tinctoruminfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectOliveira, Luiz Fernando Cappa dePinto, Plínio César de Carvalhoinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFJFinstname:Universidade Federal de Juiz de Fora (UFJF)instacron:UFJFTHUMBNAILCaracterização espectroscópica de líquen parmotrema tinctorum.pdf.jpgCaracterização espectroscópica de líquen parmotrema tinctorum.pdf.jpgGenerated Thumbnailimage/jpeg1382https://repositorio.ufjf.br/jspui/bitstream/ufjf/9488/4/Caracteriza%c3%a7%c3%a3o%20espectrosc%c3%b3pica%20de%20l%c3%adquen%20parmotrema%20tinctorum.pdf.jpg5703042750d5e7d29f9ea54da632b4dbMD54ORIGINALCaracterização espectroscópica de líquen parmotrema tinctorum.pdfCaracterização espectroscópica de líquen parmotrema tinctorum.pdfapplication/pdf57159https://repositorio.ufjf.br/jspui/bitstream/ufjf/9488/1/Caracteriza%c3%a7%c3%a3o%20espectrosc%c3%b3pica%20de%20l%c3%adquen%20parmotrema%20tinctorum.pdf85da6eb3a1c08b9ee0de93309a39b328MD51LICENSElicense.txtlicense.txttext/plain; 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dc.title.pt_BR.fl_str_mv Caracterização espectroscópica de líquen parmotrema tinctorum
title Caracterização espectroscópica de líquen parmotrema tinctorum
spellingShingle Caracterização espectroscópica de líquen parmotrema tinctorum
Oliveira, Luiz Fernando Cappa de
CNPQ::ENGENHARIAS
-
title_short Caracterização espectroscópica de líquen parmotrema tinctorum
title_full Caracterização espectroscópica de líquen parmotrema tinctorum
title_fullStr Caracterização espectroscópica de líquen parmotrema tinctorum
title_full_unstemmed Caracterização espectroscópica de líquen parmotrema tinctorum
title_sort Caracterização espectroscópica de líquen parmotrema tinctorum
author Oliveira, Luiz Fernando Cappa de
author_facet Oliveira, Luiz Fernando Cappa de
Pinto, Plínio César de Carvalho
author_role author
author2 Pinto, Plínio César de Carvalho
author2_role author
dc.contributor.author.fl_str_mv Oliveira, Luiz Fernando Cappa de
Pinto, Plínio César de Carvalho
dc.subject.cnpq.fl_str_mv CNPQ::ENGENHARIAS
topic CNPQ::ENGENHARIAS
-
dc.subject.por.fl_str_mv -
description -
publishDate 2008
dc.date.issued.fl_str_mv 2008
dc.date.accessioned.fl_str_mv 2019-03-29T15:27:02Z
dc.date.available.fl_str_mv 2019-03-15
2019-03-29T15:27:02Z
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dc.identifier.uri.fl_str_mv https://repositorio.ufjf.br/jspui/handle/ufjf/9488
url https://repositorio.ufjf.br/jspui/handle/ufjf/9488
dc.language.iso.fl_str_mv por
language por
dc.relation.ispartof.pt_BR.fl_str_mv XIV Seminário de Iniciação Científica / IV Seminário de Iniciação Científica Jr.
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Universidade Federal de Juiz de Fora (UFJF)
dc.publisher.initials.fl_str_mv UFJF
dc.publisher.country.fl_str_mv Brasil
publisher.none.fl_str_mv Universidade Federal de Juiz de Fora (UFJF)
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFJF
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