Marius Zaharia, Dan Maftei, Cristina Amalia Dumitras-Hutanu, Aurel Pui, Zomi Claude Lagobo, Olga Pintilie1, Robert Gradinaru<br>Biodegradation of Pesticides DINOCAP and DNOC<br>by Yeast Suspensions in a Batch System

Marius Zaharia, Dan Maftei, Cristina Amalia Dumitras-Hutanu, Aurel Pui, Zomi Claude Lagobo, Olga Pintilie1, Robert Gradinaru
Biodegradation of Pesticides DINOCAP and DNOC
by Yeast Suspensions in a Batch System

Abstract:

Nitroaromatic compounds constitute a major class of widely distributed environmental contaminants. Many of these pollutants, including 4,6-dinitrocresol (DNOC) or Karathane (Dinocap) have been widely used pesticides that persist in some contaminated soils, and have been found in ground-waters, causing health and environmental hazards. Dinitrophenols have multiple biological effects, being used in agriculture as insecticides, fungicides, herbicides and acaricides or in medicine and biology as metabolic inhibitors. The environmentally noxious dinitrophenols and related compounds act as uncoupling agents of oxidative phosphorylation, inhibiting ATP formation within the respiratory chain. An anaerobic consortium of different bacterial species is able to completely degrade dinitro-derivatives. However, we investigate here the bioremediation of dinitrophenol contaminated environments with the yeast Saccharomyces cerevisiae, since yeast it is cheap, easily available and largely investigated. Consequently, we have treated 10-3 M to 10-2 M solutions of two dinitrophenol pesticides (Dinocap and DNOC) with 5g/L yeast suspensions for 1 week in a batch system. The resulted supernatants were used to treat wheat seeds in germination experiments. They displayed different toxicity patterns according to their structure. Keywords: bioremediation; yeast; pesticide; dinitrophenols; germination test

Issue: 2013, Volume 64, Issue 4

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