Five morphologically distinct bacteria isolated from mangrove sediment by enrichment culture, were identified and tested for their ability to degrade dimethyl terephtalate (DMT) and its isomer dimethyl isophthalate (DMI). DMT at a concentration of 98mg/L was degraded completely within 36 days at an initial pH7.0, and two intermediates were identified as mono-methyl terephthalate and terephthalic acid. DMI at a concentration of 220mg/L was degraded within 35 days by a mixed culture, but one of the intermediates was identified as mono-methyl isophthalate and accumulated in the culture. Based on the chemical strctures of intermediates identified, the possible metabolic pathway of DMT was proposed as : DMT→MMT→TA→CO_(2) + H_(2)O. Our results suggested that DMT be easier to be degraded than DMI.
|Chinese journal of applied and environmental biology
|Published - 2004