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Master's Dissertation
DOI
https://doi.org/10.11606/D.85.2013.tde-29052013-103828
Document
Author
Full name
Klauss Engelmann
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Felinto, Maria Claudia França da Cunha (President)
Kai, Jiang
Lourenço, Ana Valéria Santos de
Title in Portuguese
Síntese de nanomarcadores luminescentes contendo íons terras raras para aplicação em testes de diagnóstico para a doença de Chagas
Keywords in Portuguese
biomarcadores
nanopartículas
PHB
terras raras
Abstract in Portuguese
Os íons terras raras apresentam propriedades espectroscópicas diferenciadas e números de coordenação entre 6 e 12 e seu estado de oxidação mais comum é o íon trivalente. Apesar de esses íons apresentarem uma baixa intensidade de luminescência, em função de sua baixa absortividade molar, esses são capazes de formar complexo onde o ligante absorva luz e transfira para o centro metálico essa energia, fenômeno conhecido como efeito antena. Essas propriedades tornam os seus complexos alvos de estudos como marcadores em ensaios imunoluminescentes, aliado ao uso de nanopartículas poliméricas. Todos esses fatores podem ser utilizados para a montagem de uma metodologia para o diagnóstico da doença de Chagas, doença tropical negligenciada, que apesar de seus mais de 100 anos após descoberta, ainda possui diversas questões em aberto e sem estudo aprofundado. Dessa maneira, propomo-nos a sintetizar e caracterizar nanopartículas de PHB misturadas aos complexos de terras raras, especificamente, complexos -dicetona - Tb3+ , Sm3+ , Gd3+, ou Eu3+. Pretende-se ligar essas nanopartículas a um espaçador como o glutaraldeído ou então diretamente a um anti-IgG humano e assim, num acoplamento antigeno-anticopo verificar sua emissão de luminescência para detecção de soro positivo para a doença. Dessa forma, obtém-se um biomarcador luminescente para diagnóstico da doença de Chagas.
Title in English
Synthesis of luminescents biomarkers containing rare-earth ions for application for diagnostics tests for disease Chagas
Keywords in English
biomarkers
nanoparticles
PHB
rare earth
Abstract in English
The rare-earth ions exhibit different spectroscopic properties, coordination numbers between 6 and 12 and trivalent is its most common oxidation state. Despite these ions present low luminescence, due to their low molar absorptivity, they are capable of forming complexes where the ligand absorbs light and transfers this energy to the metal center, a phenomenon known as "antenna effect". These properties make their complexes object of studies as markers in fluoroimmunoassay allied to the use of polymeric nanoparticles. All these factors can be used for the assembly of a methodology for diagnosis of Chagas' disease, a tropical overlooked disease, which despite its more than 100 years after discovering, still has several open issues and without thorough study. Thus, We propose to synthesize and characterize PHB nanoparticles labeled with the rare earth complexes, most specifically -diketone complexes - Tb3+ , Sm3+ , Gd3+, or Eu3+ as marker for biological targets. It's intended to link these nanoparticles to a glutaraldehyde as a spacer or directly to an anti-human IgG and thus, in a coupling antibody-antigen, verify its luminescence-emission for detecting positive serum sickness. Therefore, we have a luminescent biomarker for diagnosis of Chagas' disease.
 
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Publishing Date
2013-06-06
 
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