ABTS assay of phenol oxidase activity in soil

• Published in: Journal of microbiological methods Vol. 71; no. 3; pp. 319 - 324
• Main Authors: Floch, Carine, Alarcon-Gutiérrez, Enrique, Criquet, Stéven
• Format: Journal Article
• Language: English
• Published: Shannon Elsevier B.V 01.12.2007; Elsevier Science
• Subjects: ABTS; Bacteriological methods and techniques used in bacteriology; Bacteriology; Benzothiazoles - metabolism; Biological and medical sciences; Biological Assay; Buffers; Fundamental and applied biological sciences. Psychology; Hydrogen-Ion Concentration; Kinetics; Laccase; Microbiology; Monophenol Monooxygenase - chemistry; Monophenol Monooxygenase - metabolism; Peroxidase; Phenol oxidase activity; Polycyclic Aromatic Hydrocarbons - metabolism; Soil - analysis; Soil enzymology; Soil Pollutants - analysis; Sulfonic Acids - metabolism; Temperature; Peroxidase; Soil enzymology; ABTS; Phenol oxidase activity; Laccase; Enzyme; Oxidase; Catechol oxidase; Soils; Peroxidases; Phenols; Oxidoreductases; Microorganism
• ISSN: 0167-7012; 1872-8359
• DOI: 10.1016/j.mimet.2007.09.020

Phenol oxidases (PO) are involved in degradation of many recalcitrant aromatic compounds and may be sensitive to some pollutants. Hence, their activities may be a useful indicator for evaluating soil quality and health. To this end, the aim of this study was to develop a simple method to assay PO activity directly in bulk samples by spectrophotometric test using 2,2′-azinobis-(-3 ethylbenzothiazoline-6-sulfononic acid) diammonium salt (ABTS) as the substrate. Three Mediterranean soils were used as models. For each soil, we studied the kinetic parameters and the effects of certain factors ( i.e. amount of soil, pH, temperature, incubation time and substrate concentration) in order to determine the optimum conditions for the ABTS assay. Results showed that PO attain their optimum activities when incubating 0.1 g of soil at 30 °C for 5 min with 10 ml of a Modified Universal Buffer (MUB) at pH 2 and 200 μl of a 0.1 M ABTS solution.