Isochrysis galbana MACC/H59 was screened from eight strains of marine microalgae to investigate its capability for phenol −1 biodegradation. Batch incubation experiments were performed for 25 to 200 mg L initial phenol concentrations. Five growth inhibitory kinetic models were used to fit the experimental data. The specific activities of phenol hydroxylase and catechol −1 dioxygenase in I. galbana are measured. The results showed that phenol, at concentrations of less than 100 mg L ,couldbe completely degraded in 4 days. The growth kinetics of I. galbana under different phenol concentrations were best fitted with a Yano −1 model among five kinetics models tested. The values of substrate inhibition constant (117.59 mg L ), limiting substrate concen- −1 −1 tration (183.90 mg L ) and optimal substrate concentration (81.46 mg L ) for phenol biodegradation of I. galbana were also obtained with the Yano model. The phenol biodegradation in I. galbana was mainly catalysed by intracellular enzymes. The ortho- pathway is significantly predominant over the meta-pathway in phenol metabolism in I. galbana. High concentrations of phenol significantly inhibited the activity of phenol hydroxylase, but had no obvious effect on catechol dioxygenase. Isochrysis galbana may be a suitable marine microalgal species for
Journal of Applied Phycology – Springer Journals
Published: May 31, 2018
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