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  • 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

Filmes nanoestruturados para detecção do antígeno prostático específico / Nanoestructured film from prostate specific antigen detection

Graça, Juliana Santos 08 March 2016 (has links)
Submitted by Milena Rubi (milenarubi@ufscar.br) on 2016-11-01T17:21:21Z No. of bitstreams: 1 GRAÇA_Juliana_2016.pdf: 30861843 bytes, checksum: d0a3ae0ba919e89cac0abf5511fb0fd6 (MD5) / Approved for entry into archive by Milena Rubi (milenarubi@ufscar.br) on 2016-11-01T17:21:34Z (GMT) No. of bitstreams: 1 GRAÇA_Juliana_2016.pdf: 30861843 bytes, checksum: d0a3ae0ba919e89cac0abf5511fb0fd6 (MD5) / Approved for entry into archive by Milena Rubi (milenarubi@ufscar.br) on 2016-11-01T17:21:49Z (GMT) No. of bitstreams: 1 GRAÇA_Juliana_2016.pdf: 30861843 bytes, checksum: d0a3ae0ba919e89cac0abf5511fb0fd6 (MD5) / Made available in DSpace on 2016-11-01T17:22:03Z (GMT). No. of bitstreams: 1 GRAÇA_Juliana_2016.pdf: 30861843 bytes, checksum: d0a3ae0ba919e89cac0abf5511fb0fd6 (MD5) Previous issue date: 2016-03-08 / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / In the present work, Layer-by-Layer films of Anti-PSA antibody in the absence and presence of DPPG liposomes were produced in order to study the detection of prostate specific antigen (PSA) by different characterization techniques. The free Anti-PSA antibody in solution and incorporated into liposome was characterized by UV-vis spectroscopy and Circular Dichroism (CD). In the first characterization, it was verified the main absorption bands of the antibody and a possible aggregation in the absence of the liposome. CD measurements indicated disordered structures of free antibody. However, its secondary structure (ß-Sheet) was maintained in the presence of liposomes. The film Layer- by-Layer of free Anti-PSA antibody and incorporated into DPPG liposomes was done alternating the antibody with different polycations, PAH (poly (allylamine hydrochloride)) and PEI (poly (ethyleneimine)). The films fabricate on quartz and gold sensors were characterized by UV-vis and SPR spectroscopy. These results proved the deposition of the materials on different substrates and the PEI was the best polyelectrolyte for immobilization of the antibody. Through the SPR measures it was simulated thickness and refractive index of the film bilayers. The PEI, PVS and Anti-PSA casting film and PEI/PVS and PEI/Anti-PSA LbL films were characterized by FTIR, it was observed through the bands of the spectra the interaction between the polyelectrolyte and found the deposition of antibody in the film. Acting as PSA detection unit, the (PEI/PVS)1/(PEI/Anti-PSA+DPPG)5 and (PEI/PVS)1/(PEI/Nati-PSA)5 films were characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and SPR and both systems were able to detect PSA at concentrations below 4 ng.mL-1 that is the normal concentration for a healthy individual. / No presente trabalho foram produzidos filmes nanoestruturados camada por camada (LbL) de anticorpo Anti-PSA na ausência e na presença de lipossomos de DPPG, a fim de estudar a detecção do antígeno prostático específico (PSA) por diferentes técnicas de caracterização. A solução de anticorpo Anti-PSA, livre e incorporado em lipossomo, foi caracterizada por espectroscopia UV-vis e Dicroísmo Circular (CD). Sendo que no primeiro caso, foram verificadas as principais bandas de absorção do anticorpo e uma possível agregação na ausência do lipossomo. As medidas de CD indicaram estruturas desordenadas do anticorpo livre e na presença do lipossomo o anticorpo manteve a sua estrutura secundária (Folha-ß). Os filmes LbL de anticorpo Anti-PSA e Anti-PSA+DPPG, alternados com diferentes policátions, PAH (poli(alilamina hidroclorada)) ou PEI (poli(etilenoimina)) foram fabricados sobre quartzo e o sensor de ouro modificado com 11-MUA e caracterizados por espectroscopia UVvis e Ressonância Plasmônica de Superfície (SPR), no qual foi constatado a deposição dos materiais nos diferentes substratos e definido o PEI como melhor polieletrólito para imobilização do anticorpo. Através das medidas de SPR também foi simulado a espessura e o índice de refração das bicamadas de filmes. Os filmes casting de PEI, PVS e Anti-PSA e os filmes LbL destes materiais foram caracterizados por Espectroscopia de Absorção no Infravermelho com Transformada de Fourier (FTIR), através das bandas dos espectros no modo de transmissão e reflexão verificou-se a interação entre os polieletrólitos e constatou a deposição do anticorpo no filme. Atuando como unidade de detecção do PSA os filmes de (PEI/PVS)1/(PEI/Anti-PSA+DPPG)5 e de (PEI/PVS)1/(PEI/Nati-PSA)5 foram caracterizados por voltametria cíclica (VC), espectroscopia de impedância eletroquímica (EIE) e por SPR, e, ambos sistemas foram capazes de detectar o PSA em concentrações inferiores a 4 ng.mL-1 que é a concentração normal para um indivíduo saudável. / 2013/23288-0

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