期刊
BIORESOURCE TECHNOLOGY
卷 253, 期 -, 页码 105-111出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.12.087
关键词
Cyanate; Carbonic anhydrase; Cyanase; Wastewater; Magnetic nanoparticles
资金
- National Research Foundation [NRF-UID 103232]
- Technology Innovation Agency
- Durban University of Technology, Durban, South Africa
Cyanase detoxifies cyanate by transforming it to ammonia and carbon dioxide in a bicarbonate-dependent reaction, however, dependence on bicarbonate limits its utilization in large-scale applications. A novel strategy was therefore developed for overcoming this bottleneck by the combined application of cyanase (rTl-Cyn) and carbonic anhydrase (rTl-CA). The synergistic effect of rTl-Cyn and rTl-CA could reduce the dependence of bicarbonate by 80%, compared to using rTl-Cyn alone. Complete degradation of cyanate (4 mM) was achieved with buffered conditions and 85 +/- 5% degradation with industrial wastewater sample, when 20 U of rTl-Cyn was applied. Furthermore, a similar percentage of degradation was achieved using 80% less bicarbonate, when rTl-Cyn and rTl-CA were used together under identical conditions. In addition, rTl-Cyn and rTl-CA were immobilized onto the magnetic nanoparticles and their catalytic activity, stability and reusability were also evaluated. This is the first report on the synergistic biocatalysis by rTl-Cyn and rTl-CA, for cyanate detoxification.
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