Abstract
α-Galactosidases has the potential to hydrolyze α-1-6 linkages in raffinose family oligosaccharides (RFO). Aspergillus terreus cells cultivated on wheat bran produced three extracellular forms of α-galactosidases (E1, E2, and E3). E1 and E2 α-galactosidases presented maximal activities at pH 5, while E3 α-galactosidase was more active at pH 5.5. The E1 and E2 enzymes showed stability for 6 h at pH 4–7. Maximal activities were determined at 60, 55, and 50°C, for E1, E2, and E3 α-galactosidase, respectively. E2 α-galactosidase retained 90% of its initial activity after 70 h at 50°C. The enzymes hydrolyzed ρNPGal, melibiose, raffinose and stachyose, and E1 and E2 enzymes were able to hydrolyze guar gum and locust bean gum substrates. E1 and E3 α-galactosidases were completely inhibited by Hg2+, Ag+, and Cu2+. The treatment of RFO present in soy milk with the enzymes showed that E1 α-galactosidase reduced the stachyose content to zero after 12 h of reaction, while E2 promoted total hydrolysis of raffinose. The complete removal of the oligosaccharides in soy milk could be reached by synergistic action of both enzymes
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This study was supported by grants of the Fundação de Amparo à Pesquisa do Estado de Minas Gerais-FAPEMIG and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-CAPES, Brazil.
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Ferreira, J.G., Reis, A.P., Guimarães, V.M. et al. Purification and Characterization of Aspergillus terreus α-Galactosidases and Their Use for Hydrolysis of Soymilk Oligosaccharides. Appl Biochem Biotechnol 164, 1111–1125 (2011). https://doi.org/10.1007/s12010-011-9198-y
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DOI: https://doi.org/10.1007/s12010-011-9198-y