Dehalogenation and detoxification of 2,4-dichlorophenol with induced laccase

Year 2011, Volume: 70 Issue: 2, 25 - 34, 27.10.2011

Eda Benli Serap Gedikli Pınar Aytar Gökhan Güngörmedi Ahmet Çabuk

Abstract

2,4-dichlorophenol is a recalcitrant compound which is used in the production of pesticides. Chlorine removal of 2,4-dichlorophenol with the crude laccase produced Trametes versicolor ATCC (200801) in potato dextrose broth including wheat bran was investigated. The optimization parameters for dechlorination such as pH, initial substrate concentration, reaction period, reaction temperature and amount of enzyme were examined. At the end of these studies, pH 4, 400 μM of initial substrate concentration, 7 min of reaction time, 30 ºC of temperature were selected. It was tested that correlation with oxygen consumption and dechlorination processes under the determined optimum conditions before and the decrease of dissolved oxygen was observed. Also, after the dechlorination of this compound, changes in chemical structure of the compound were determined with FTIR analysis and toxicity alterations with Microtox test were studied. Wide and intense peaks at spectra may be an evidence to dechlorination occurring with load transfers and electrostatic interactions. Toxicity experiments showed that 2,4-DCP was detoxified in addition to dechlorination. Besides, statistical analyses were performed for dechlorination experiments.
Keywords: 2,4-DCP, laccase, dechlorination

Keywords

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İndüklenmiş lakkaz ile 2,4-diklorofenolün dehalojenasyonu ve detoksifikasyonu

Abstract

2,4-diklorofenol pestisitlerin üretiminde kullanılan rekalsitrant bir bileşiktir. Buğday kepeği ile indüklenmiş patates dekstroz broth besiyerinde üretilen Trametes versicolor ATCC (200801)’den elde edilen ham lakkaz ile 2,4-diklorofenolden klorun uzaklaştırılması değerlendirilmiştir. pH, substrat konsantrasyonu, reaksiyon süresi, sıcaklığı ve enzim miktarı gibi deklorinasyon için optimizasyon parametreleri çalışılmıştır. Bu çalışmaların sonunda pH 4, 400 µM başlangıç substrat konsantrasyonu, reaksiyon süresi 7 dakika, sıcaklık 30 ºC seçilmiştir. Daha once belirlenen optimum şartlarda oksijen tüketimi ile deklorinasyon süreci arasındaki ilişki incelenmiştir ve çözünmüş oksijende azalma gözlemlenmiştir. Bu bileşiğin deklorinasyonundan sonra kimyasal yapısındaki Benli et.al. / IUFS Journal of Biology 2011 70(2):25-34 değişiklikler FT-IR analizi ile, toksisitesindeki değişimler ise Microtox ile belirlenmiştir. Spektradaki yayvan ve şiddetli pikler; yük transferi ve elektrostatik etkileşimlerle meydana gelen deklorinasyona bir kanıt olarak gösterilebilir. Toksisite deneyleri, 2,4-DCP’nin deklorinasyona ilaveten detoksifiye olduğunu da göstermiştir. Bunun yanısıra deklorinasyon deneylerinde istatistik analizler gerçekleştirilmiştir.

Keywords

2, 4-DCP, deklorinasyon, lakkaz

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