Produção e purificação integrada de protease fibrinolítica por Mucor subtilissimus UCP 1262

• Autor(a) principal: CLEMENTINO, Ellen Leal
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRPE
• Texto Completo: http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/7217
• topic: Protease fibrinolítica; Mucor subtilissimus; Fermentação extrativa; CIENCIAS AGRARIAS::MEDICINA VETERINARIA

The fibrinolytic proteases, due to its potential use in the treatment of thrombosis, have drawn attention from researchers because such diseases are a leading cause of death worldwide. The objective of this research was to produce and extract simultaneously the fibrinolytic protease by Mucor subtilissimus UCP 1262 through extractive fermentation with PEG/sodium sulfate. Homogeneous fermentations were carried out by changing the nitrogen source (soybean flour or wheat -1%), carbon source with 1% glucose, agitation 120 rpm and 30°C. Extractive fermentation assays were made using a 23 factorial design, changing the PEG molar mass (4,000, 6,000 and 8,000 g/mol), the PEG concentration (18, 24 and 30%) and salt concentration (10; 11,5; 13%). After 72 hours fermentation, the fibrinolytic protease had its best output in soy flour obtaining 13.43 U/mL and specific activity 749.27 U/mg in homogeneous cultures. However in the extractive fermentation, the sodium sulfate rich phase showed 15.40 U/mL fibrinolytic activity and 34.17 U/mg for specific activity in the assay comprises of sodium sulphate concentration (10%) and PEG (18%) and PEG molar mass (8000g/mol) and yields (Y) of 80% of the fibrinolytic protease. The protease has a pH optimum between 7.0 and stability pH 6.0 to 8.5 and optimum temperature 50°C, stable between 10°C to 50°C. It has similar specificity to chymotrypsin enzyme it has been classified as a serine protease having molecular weight of 52-kDa. Thus it was possible to pre-purify the fibrinolytic protease having a low cost process and considerably faster when compared to other isolated production and purification techniques by replacing the initial stages of conventional separation processes.