Inhibition of the activated sludge-associated enzyme phosphatase by transition metal oxyanions
نویسندگان
چکیده
Abstract Organic esters of phosphoric acid and other organophosphorous compounds are enzymatically hydrolyzed during wastewater treatment by microbial phosphoesterases, especially phosphomonoesterase (phosphatase). For physiological reasons, the enzyme is inhibited its main inorganic reaction product, ortho-phosphate. It known that oxyanions transition metals, resembling molecular topology ortho-phosphate, e.g. vanadate tungstate, more potent inhibitors for alkaline phosphatase than phosphate. To proof this effect activated sludge, a multitude samples from communal plant was exposed at pH values 7.00 to 8.50 vanadate, molybdate. Inhibition effects were determined sensitive fluorimetric microplate assay characteristic parameters (IC50 IC20 concentrations) deduced modelled dose-response functions. Mean inhibitor concentrations (in brackets: ranges) causing 50% inactivation (IC50) 7.50 2.5 (1.3–4.1) ?M 2.9 (1.6–5.5) 41.4 (33.6–56.7) Vanadate tungstate between 0.6 0.7 provoked 20% (IC20) inhibition. The inhibition efficiency molybdate decreased with increasing pH, whereas reacted independently. These results underline necessity consider assessing limitations potentials biological processes.
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ژورنال
عنوان ژورنال: Water Science and Technology
سال: 2021
ISSN: ['0273-1223', '1996-9732']
DOI: https://doi.org/10.2166/wst.2021.172