Despirogenação de soluções de imunoglobulina G humana : adsorção de endotoxinas em membrana de quitosana
AUTOR(ES)
Romi Lamb Machado
DATA DE PUBLICAÇÃO
2003
RESUMO
Endotoxin (ET) contamination in intravascular injection products is a problem for the pharmaceutical industry due to the difficulty of its removal and elevated toxicity. Many techniques have been studied aiming the depyrogenation (ET removal) of protein solutions, among them the membrane chromatography seems to be a promising one. In this work, cross-linked macroporous chitosan membranes were obtained having a good flow dynamics, focusing the depyrogenation of buffering solutions, physiologic serum and human IgG solutions. Filtration experiments with human IgG diluted in buffering solution were conducted to verify the IgG adsorption on the membrane. The buffering solutions that resulted a lower IgG adsorption were sodium phosphate pH 8.0 and Tris-HCl pH 7.0 (0.49 mg/cm3 and 0.73 mg/cm3 , respectively). The adsorption experiments results using buffer solutions artificially contaminated with ET showed that the Tris-HCl pH 7.0 buffering solution favoured a higher ET adsorption on the chitosan membrane being the filtrated concentrations 0.58 EU/mL and 8.36 EU/mL to the feed flow of 18.63 EU/mL and 541.4 EU/mL, respectively. The influence of salt presence in the solution was tested for the ET removal of artificially contaminated physiologic serum resulting in a 50.68% adsorption at a low ET concentration (42.49 EU/mL) and 92.23% at a high ET concentration (889.61 EU/mL). The IgG presence (1 mg/mL) in Tris-HCl pH 7.0 buffer reduced the ET adsorption so that a filtrated concentration of 4.05 and 71.15 EU/mL were obtained from a 116.43 and 796.93 EU/mL feed, respectively, and a protein recovery of 100% and 96.37%. These results showed that chitosan membrane has a potential to be used as an adsorption matrix for ET removal in solutions, eventhought safety concentration values that allows a parenteral injection have not been achieved in samples containing proteins
ASSUNTO(S)
adsorção separação (tecnologia) imunoglobulina g endotoxina quitosana
ACESSO AO ARTIGO
http://libdigi.unicamp.br/document/?code=vtls000289739Documentos Relacionados
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