Accelerated degradation of dipentyl phthalate by Fusarium oxysporum f. sp. pisi cutinase and toxicity evaluation of its degradation products using bioluminescent bacteria

Ji Young Ahn, Yang Hoon Kim, Jiho Min, Jeewon Lee

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Abstract

The efficiency of two lipolytic enzymes (fungal cutinase and yeast esterase) in the degradation of dipentyl phthalate (DPeP) was investigated. The DPeP degradation rate of fungal cutinase was surprisingly high, i.e., almost 60% of the initial DPeP (500 mg/L) was decomposed within 2.5 hours, and nearly 40% of the degraded DPeP disappeared within the initial 15 minutes. With the yeast esterase, despite the same concentration, >87% of the DPeP remained even after 3 days of treatment. The final chemical composition after 3 days was significantly dependent on the enzyme used. During degradation with cutinase, most DPeP was converted into 1,3-isobenzofurandione (IBF) by diester hydrolysis. However, in the degradation by esterase, pentyl methyl phthalate, in addition to IBF, was produced in abundance. Toxicity monitoring using various recombinant bioluminescent bacteria showed that the degradation products from yeast esterase contained a toxic hazard, causing oxidative stress and damage to protein synthesis.

Original languageEnglish
Pages (from-to)340-344
Number of pages5
JournalCurrent Microbiology
Volume52
Issue number5
DOIs
Publication statusPublished - 2006 May 1

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ASJC Scopus subject areas

  • Microbiology

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