Publication Details

Reference Category Journals
DOI / URL link
Document Shareable Link
Title (Primary) Dynamic measurement of oxidase activity based on oxygen consumption in open systems
Author Demarche, P.; Junghanns, C.; Ardao, I.; Agathos, S.N.;
Journal Engineering in Life Sciences
Year 2015
Department ZENCO;
Volume 15
Issue 8
Language englisch;
POF III (all) T31; T41;
Keywords Activity assay; Ascorbate oxidase; Laccase; O2 optode sensor; Oxygen consumption rate
UFZ wide themes RU2;
Abstract Oxidases catalyze the oxidation of a variety of substrates with the concomitant reduction of molecular oxygen as a final electron acceptor. UV-visible spectrophotometry is a simple and high-throughput method commonly used to measure oxidase activities. However, drawbacks such as light scattering exist especially concerning the activity assessment of enzymes immobilized on supports. Monitoring of the universal cosubstrate O2 circumvents these drawbacks. This study aimed at developing a methodology that allows activity measurement of many types of oxidases based on O2 consumption applicable to various open systems. Dissolved oxygen in the reaction medium was monitored by an O2 sensor and the reaction rate was deduced from the O2 mass balance equation correcting for atmospheric diffusion. Common activity units (μMproduct min−1 or U/L) could be subsequently derived using calibration curves. The sensitivity of the method toward temperature, atmospheric pressure, and ionic strength variations was evaluated, and made it possible to define operating windows for the simplification of the proposed methodology.
ID 16983
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=16983
Demarche, P., Junghanns, C., Ardao, I., Agathos, S.N. (2015):
Dynamic measurement of oxidase activity based on oxygen consumption in open systems
Eng. Life Sci. 15 (8), 804 - 814