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Characterization of glycerol kinase from baker's yeast: response surface modeling of enzymatic reaction
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Orientador(es)
Resumo(s)
The present study describes a methodology of dosage of glycerol kinase (GK) from baker’s yeast. The standardization of the activity of the
glycerol kinase from baker’s yeast was accomplished using the diluted enzymatic preparation containing glycerol phosphate oxidase (GPO) and
glycerol kinase. The mixture was incubated at 60 ◦C by 15 min and the reaction was stopped by the SDS solution addition. A first set of experiments
was carried out in order to investigate the individual effect of temperature (T), pH and substrate concentration (S), on GK activity and stability.
The pH and temperature stability tests showed that the enzyme presented a high stability to pH 6.0–8.0 and the thermal stability were completely
maintained up to 50 ◦C during 1 h. The Km of the enzyme for glycerolwas calculated to be 2mMand Vmax to be 1.15 U/mL. In addition, modeling and
optimization of reaction conditions was attempted by response surface methodology (RSM). Higher activity values will be attained at temperatures
between 52 and 56 ◦C, pH around 10.2–10.5 and substrate concentrations from 150 to 170 mM.
This low cost method for glycerol kinase dosage in a sequence of reactions is of great importance for many industries, like food, sugar and
alcohol. RSM showed to be an adequate approach for modeling the reaction and optimization of reaction conditions to maximize glycerol kinase
activity
Descrição
Palavras-chave
glycerol kinase baker's yeast partial purification response surface methodology stability
Contexto Educativo
Citação
"Journal of Molecular Catalysis. B: Enzymatic". ISSN 1381-1177. 52-53 (2008) 113-120