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dc.typeArtigo de periódicopt_BR
dc.titleEffects Of High Pressure Homogenization On The Activity, Stability, Kinetics And Three-dimensional Conformation Of A Glucose Oxidase Produced By Aspergillus Niger.pt_BR
dc.contributor.authorTribst, Alline Artigiani Limapt_BR
dc.contributor.authorCota, Júniopt_BR
dc.contributor.authorMurakami, Mario Tyagopt_BR
dc.contributor.authorCristianini, Marcelopt_BR
unicamp.authorAlline Artigiani Lima Tribst, Department of Food Technology (DTA), School of Food Engineering (FEA), University of Campinas (UNICAMP), Campinas, SP, Brazil.pt_BR
unicamp.authorJúnio Cota, Department of Food Science (DCA), School of Food Engineering (FEA), University of Campinas (UNICAMP), Campinas, SP, Brazilpt_BR
unicamp.authorMarcelo Cristianini, Department of Food Technology (DTA), School of Food Engineering (FEA), University of Campinas (UNICAMP), Campinas, SP, Brazil.pt_BR Bioethanol Science and Technology Laboratory (CTBE/CNPEM), Campinas, SP, Tyago Murakami, Brazilian Biosciences National Laboratory (LNBio/CNPEM), Campinas, SP,
dc.description.abstractHigh pressure homogenization (HPH) is a non-thermal method, which has been employed to change the activity and stability of biotechnologically relevant enzymes. This work investigated how HPH affects the structural and functional characteristics of a glucose oxidase (GO) from Aspergillus niger. The enzyme was homogenized at 75 and 150 MPa and the effects were evaluated with respect to the enzyme activity, stability, kinetic parameters and molecular structure. The enzyme showed a pH-dependent response to the HPH treatment, with reduction or maintenance of activity at pH 4.5-6.0 and a remarkable activity increase (30-300%) at pH 6.5 in all tested temperatures (15, 50 and 75°C). The enzyme thermal tolerance was reduced due to HPH treatment and the storage for 24 h at high temperatures (50 and 75°C) also caused a reduction of activity. Interestingly, at lower temperatures (15°C) the activity levels were slightly higher than that observed for native enzyme or at least maintained. These effects of HPH treatment on function and stability of GO were further investigated by spectroscopic methods. Both fluorescence and circular dichroism revealed conformational changes in the molecular structure of the enzyme that might be associated with the distinct functional and stability behavior of GO.en
dc.relation.ispartofPlos Onept_BR
dc.relation.ispartofabbreviationPLoS ONEpt_BR
dc.identifier.citationPlos One. v. 9, n. 7, p. e103410, 2014.pt_BR
dc.description.provenanceMade available in DSpace on 2015-11-27T13:42:59Z (GMT). No. of bitstreams: 1 pmed_25061935.pdf: 1386950 bytes, checksum: de31fc72184246131f03f090b9da613f (MD5) Previous issue date: 2014en
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