Increase stability and activity of alcohol oxidase under high hydrostatic pressure
Buchholz, Martina Irene
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Alcohol oxidase (AOX), in the presence of oxygen, catalyzes the bioconversion of short-chained alcohols into their corresponding aldehydes and ketones. This enzyme has been used for electrochemical biosensors with applications in the food, medical, forensic and environmental industries. Alcohol oxidase has the potential to produce aldehydes that can serve as precursors of fine chemicals and flavour compounds naturally. However due to AOX’s poor stability, its practicality for biosensors is very limited. The application of high hydrostatic pressure (HHP) to stabilize and increase the activity of AOX at selected temperatures is reported. Intrinsic thermolabile and thermoresistant fractions of AOX were observed during thermal inactivation at atmospheric and high pressures. The slowest rates of inactivation were generally concentrated between 120 MPa and 160 MPa. A 3.2-fold increase in Vmax occurred at 160 MPa at 53.2 °C as compared to the AOX activity at 37 °C and atmospheric pressure.