• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1
  • Tagged with
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Desenvolvimento de novas metodologias PSI-MS para bioanálises / Development of new PSI-MS methodologies for bioanalysis

Fernandes, Aline Rosa 02 April 2018 (has links)
Submitted by Franciele Moreira (francielemoreyra@gmail.com) on 2018-05-28T17:55:37Z No. of bitstreams: 2 Dissertação - Aline Rosa Fernandes - 2018.pdf: 2708071 bytes, checksum: 09cf08ef257f815da8d21193826fc32f (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-05-29T11:24:27Z (GMT) No. of bitstreams: 2 Dissertação - Aline Rosa Fernandes - 2018.pdf: 2708071 bytes, checksum: 09cf08ef257f815da8d21193826fc32f (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2018-05-29T11:24:27Z (GMT). No. of bitstreams: 2 Dissertação - Aline Rosa Fernandes - 2018.pdf: 2708071 bytes, checksum: 09cf08ef257f815da8d21193826fc32f (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2018-04-02 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / Paper spray ionization (PSI) is an environmental ionization technique in mass spectrometry (MS), where the sample is deposited on triangular paper moistened with solvent and the ionization process occurs by the application of high voltage on the paper. An important factor that can affect its performance is ion suppression. Aiming to reduce this effect and the exclusion of macromolecules in complex samples, the RAM-PSI-MS method for the analysis of dopamine and epinephrine in plasma was developed and validated. A methodology for analyzing creatinine in the urine was also developed using graphene oxide (GO) modified paper. The methods developed were efficient and promising in improving the role for PSI-MS analysis. The graphene oxide coating was able to improve the time and stability of the spray, in addition to reducing the effect of ion suppression. Already coating the paper with ISRP-RAM phase made it possible to analyze a complex sample, such as plasma, without any sample preparation, obtaining very satisfactory results. Showing that it is possible, practically, to eliminate the inherent problems of PSI-MS, only with the paper coating. / Paper spray ionization (PSI) é uma técnica de ionização ambiente em espectrometria de massas (MS), onde a amostra é depositada sobre papel triangular umedecido com solvente e o processo de ionização ocorre pela aplicação de alta voltagem no papel. Um importante fator que pode afetar seu desempenho é a supressão iônica. Visando a diminuição desse efeito e a exclusão de macromoléculas em amostras complexas foi desenvolvido e validado o método RAM-PSI- MS para analise de dopamina e epinefrina em plasma. Foi também desenvolvida uma metodologia para análise de creatinina na urina utilizando um papel modificado com óxido de grafeno (GO). Os métodos desenvolvidos foram eficientes e promissores na melhora do papel para analises de PSI-MS. O revestimento com óxido de grafeno foi capaz de melhorar o tempo e a estabilidade do spray, além de diminuir o efeito de supressão iônica. Já revestindo o papel com fase ISRP-RAM tornou possível analisar uma amostra complexa, como o plasma, sem nenhum preparo de amostra, obtendo resultados bastante satisfatórios. Mostrando que possível, praticamente, eliminar os problemas inerentes do PSI-MS, apenas com o revestimento do papel.

Page generated in 0.0607 seconds