Síntese de nanopartículas de sílica mesoporosa e aplicações como biomaterial
Carregando...
Arquivos
Data
2012-02-03
Autores
Mendes, Larissa Souza [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
Materiais mesoporosos têm sido largamente estudados devido ás suas características e potenciais aplicações. A sílica mesoporosa apresenta elevada área de superfície específica (~1000 m2.g-1) e tamanho de poros usualmente em torno de 2-30 nm, atraindo atenção para aplicações em catálise, adsorção e troca iônica. O peptídeo de crescimento osteogênico (OGP) é um tetradecapeptídeo endógeno, cuja forma ativa gera ligações covalentes com as proteinases, mostrando ser um bom agente anabólico e estimulador hematopoiético. Neste contexto, o objetivo deste trabalho foi à preparação de materiais inorgânicos mesoporosos, a partir de sílica e de um surfactante não-iônico como agente direcionador de estrutura, incorporados com OGP, para atuarem como biomateriais na regeneração óssea. O peptídeo foi sintetizado pelo método em fase sólida (SPFS; estratégia Fmoc); foi purificado e caracterizado por Cromatografia Líquida de Alta Eficiência (HPLC), Espectrometria de Massas e Análise de Aminoácidos. Os materiais sólidos foram caracterizados por Espectroscopia na região do Infravermelho (FT-IR), Difração de Raios X (XRD), Espalhamento de Raios X à Baixo Ângulo (SAXS), Adsorção-dessorção de Nitrogênio a 77K (BET), Microscopia Eletrônica de Transmissão (TEM) e Microscopia Eletrônica de Varredura (SEM). A bioatividade in vitro desses materiais em Simulated Body Fluid (SBF) foi verificada por FTIR, SEM e XRD, e a adsorção e liberação do peptídeo marcado com 5,6-carboxifluoresceína da matriz mesoporosa foi monitorada por Espectroscopia de Fluorescência. Ficou evidente que a composição do material refletiu em diferentes características físicas, onde a área de superfície específica foi de 880, 484, 220 m2.g-1, para a LMSiO, LMSiCaP I e II, respectivamente, que por sua vez influenciou na porcentagem de...
Mesoporous materials have been widely studied due to their characteristics and potencial applications. The mesoporous silica has a high specific surface area (1000 m2.g-1) and pore size is usually around 2-30nm, and it has attracted much attention for applications in catalysis, adsorption and ion exchange. The Osteogenic Growth Peptide (OGP) is an endogenous tetradecapeptídeo, which generates the active form covalent bonds with proteases, showing to be a good anabolic agent and hematopoietic stimulator. In this sense, this work presents the preparation of inorganic mesoporous materials from silica and a nonionic surfactant as a structure director agent incorporated with OGP to act as biomaterials in bone regeneration. The peptide was synthesized by solid-phase method (SPFS; Fmoc strategy), purified and characterized by High Performance Liquid Chromatography (HPLC), Mass Spectrometry and Aminoacid Analysis. The solids were characterized by Infrared Spectroscopy (FT-IR), X-ray Diffraction (XRD), Small Angle X-ray Scattering (SAXS), Adsorption-desorption of Nitrogen at 77K (BET), Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM). The in vitro bioactivity of these materials in Simulated Body Fluid (SBF) was studied by Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD), and loading and release of the peptide labeled with 5,6-carboxyfluorescein of mesoporous matrix was monitored by Fluorescence Spectroscopy. It was evident that the composition of the material reflects different physical characteristics, where the specific are was 880, 484, 220 m2.g-1 for LMSiO, LMSiCaP I e II, respectively, which in turn influenced the percentage of incorporation of the peptide (99% in LMSiO, 55% in LMSiCaO I e no adsorption in LMSiCaP II). The results... (Complete abstract click electronic access below)
Mesoporous materials have been widely studied due to their characteristics and potencial applications. The mesoporous silica has a high specific surface area (1000 m2.g-1) and pore size is usually around 2-30nm, and it has attracted much attention for applications in catalysis, adsorption and ion exchange. The Osteogenic Growth Peptide (OGP) is an endogenous tetradecapeptídeo, which generates the active form covalent bonds with proteases, showing to be a good anabolic agent and hematopoietic stimulator. In this sense, this work presents the preparation of inorganic mesoporous materials from silica and a nonionic surfactant as a structure director agent incorporated with OGP to act as biomaterials in bone regeneration. The peptide was synthesized by solid-phase method (SPFS; Fmoc strategy), purified and characterized by High Performance Liquid Chromatography (HPLC), Mass Spectrometry and Aminoacid Analysis. The solids were characterized by Infrared Spectroscopy (FT-IR), X-ray Diffraction (XRD), Small Angle X-ray Scattering (SAXS), Adsorption-desorption of Nitrogen at 77K (BET), Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM). The in vitro bioactivity of these materials in Simulated Body Fluid (SBF) was studied by Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD), and loading and release of the peptide labeled with 5,6-carboxyfluorescein of mesoporous matrix was monitored by Fluorescence Spectroscopy. It was evident that the composition of the material reflects different physical characteristics, where the specific are was 880, 484, 220 m2.g-1 for LMSiO, LMSiCaP I e II, respectively, which in turn influenced the percentage of incorporation of the peptide (99% in LMSiO, 55% in LMSiCaO I e no adsorption in LMSiCaP II). The results... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Biotecnologia, Peptídeos, Adsorção, Moleculas, Biotechnology, Peptides, Adsorption, Molecules
Como citar
MENDES, Larissa Souza. Síntese de nanopartículas de sílica mesoporosa e aplicações como biomaterial. 2012. 109 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Química, 2012.