PMID- 16616957
OWN - NLM
STAT- MEDLINE
DCOM- 20081031
LR  - 20141120
IS  - 1090-2414 (Electronic)
IS  - 0147-6513 (Linking)
VI  - 66
IP  - 3
DP  - 2007 Mar
TI  - Reduction of 2,4-dichlorophenol toxicity to Pseudomonas putida after oxidative 
      incubation with humic substances and a biomimetic catalyst.
PG  - 335-42
AB  - The effect of a synthetic iron(III)-porphyrin 
      meso-tetra(2,6-dichloro-3-sulfonatophenyl)porphyrinate as a biomimetic catalyst 
      in the oxidative treatment of 2,4-dichlorophenol (2,4-DCP) with humic substances 
      and H(2)O(2) was evaluated in factorial design experiments conducted at different 
      concentrations of 2,4-DCP (0-25 ppm) and different incubation treatment times (0, 
      24, 96, or 120 h). In the absence of this treatment, bioassays with the bacterium 
      Pseudomonas putida (ATCC11250) showed decreasing specific growth rates mu (used 
      here to quantify 2,4-DCP toxicity) with increasing concentrations of 2,4-DCP. 
      However, when 2,4-DCP was treated as mentioned above the toxicity of the 
      resulting 2,4-DCP solution was reduced significantly. At low 2,4-DCP 
      concentrations (up to 5 ppm) and long incubation periods (as long as 120 h), the 
      specific growth rate mu was comparable to that of cultures grown in the absence 
      of 2,4-DCP. The reduction in toxicity was directly correlated to a decrease in 
      the concentration of 2,4-DCP in the treated solutions, as measured by 
      high-performance liquid chromatography. The reduced concentrations of 2,4-DCP in 
      the treated solutions could be correctly predicted based on the relationship 
      between the specific growth rates and the 2,4-DCP concentrations in untreated 
      solutions. These results indicate that the oxidative coupling of 2,4-DCP to humic 
      substances catalyzed by the synthetic iron(III)-porphyrin catalyst in the 
      presence of H(2)O(2) is responsible for the removal of 2,4-DCP from solutions. 
      This approach appears to be a promising alternative treatment to reduce 2,4-DCP 
      bioavailability and thus toxicity in the environment.
FAU - Hahn, Dittmar
AU  - Hahn D
AD  - Department of Chemical Engineering, New Jersey Institute of Technology, 323 Dr. 
      Martin Luther King Blvd., Newark, NJ 07102, USA. dh49@txstate.edu
FAU - Cozzolino, Annunziata
AU  - Cozzolino A
FAU - Piccolo, Alessandro
AU  - Piccolo A
FAU - Armenante, Piero M
AU  - Armenante PM
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20060417
PL  - Netherlands
TA  - Ecotoxicol Environ Saf
JT  - Ecotoxicology and environmental safety
JID - 7805381
RN  - 0 (Chlorophenols)
RN  - 0 (Ferric Compounds)
RN  - 0 (Humic Substances)
RN  - 0 (Metalloporphyrins)
RN  - BBX060AN9V (Hydrogen Peroxide)
RN  - R669TG1950 (2,4-dichlorophenol)
SB  - IM
MH  - Biomimetics
MH  - Catalysis
MH  - Chlorophenols/chemistry/*toxicity
MH  - Environmental Restoration and Remediation
MH  - Ferric Compounds/*chemistry
MH  - *Humic Substances
MH  - Hydrogen Peroxide/chemistry
MH  - Metalloporphyrins/*chemistry
MH  - Oxidation-Reduction
MH  - Pseudomonas putida/*drug effects/growth & development
EDAT- 2006/04/18 09:00
MHDA- 2008/11/01 09:00
CRDT- 2006/04/18 09:00
PHST- 2005/12/07 00:00 [received]
PHST- 2006/01/20 00:00 [revised]
PHST- 2006/02/09 00:00 [accepted]
PHST- 2006/04/18 09:00 [pubmed]
PHST- 2008/11/01 09:00 [medline]
PHST- 2006/04/18 09:00 [entrez]
AID - S0147-6513(06)00044-3 [pii]
AID - 10.1016/j.ecoenv.2006.02.004 [doi]
PST - ppublish
SO  - Ecotoxicol Environ Saf. 2007 Mar;66(3):335-42. doi: 10.1016/j.ecoenv.2006.02.004. 
      Epub 2006 Apr 17.