News Column

New Nitro Compounds Findings from University of California Outlined

May 12, 2014

By a News Reporter-Staff News Editor at Biotech Business Week -- Investigators publish new report on Nitro Compounds. According to news reporting originating from Berkeley, California, by NewsRx correspondents, research stated, "The stress of poised cathode potential condition and carbon source switchover for functional biocathode microbial community influences is poorly understood. Using high-throughput functional gene array (GeoChip v4.2) and Illumina 16S rRNA gene MiSeq sequencing, we investigated the phylogenetic and functional microbial community of the initial inoculum and biocathode for bioelectrochemical reduction of nitrobenzene to less toxic aniline in response to carbon source switchover (from organic glucose to inorganic bicarbonate)."

Our news editors obtained a quote from the research from the University of California, "Selective transformation of nitrobenzene to aniline maintained in the bicarbonate fed biocathode although nitrobenzene reduction rate and aniline formation rate were significantly decreased compared to those of the glucose-fed biocathode. When the electrical circuit of the glucose-fed biocathode was disconnected, both rates of nitrobenzene reduction and of aniline formation were markedly decreased, confirming the essential role of an applied electric field for the enhancement of nitrobenzene reduction. The stress of poised cathode potential condition led to clear succession of microbial communities from the initial inoculum to biocathode and the carbon source switchover obviously changed the microbial community structure of biocathode. Most of the dominant genera were capable of reducing nitroaromatics to the corresponding aromatic amines regardless of the performance mode. Heterotrophic Enterococcus was dominant in the glucose-fed biocathode while autotrophic Paracoccus and Variovorax were dominant in the bicarbonate-fed biocathode. Relatively higher intensity of diverse multi-heme cytochrome c (putatively involved in electrons transfer) and carbon fixation genes was observed in the biocarbonate-fed biocathode, likely met the requirement of the energy conservation and maintained the nitrobenzene selective reduction capability after carbon source switchover. Extracellular pilin, which are important for biofilm formation and potential conductivity, had a higher gene abundance in the glucose-fed biocathode might explain the enhancement of electro-catalysis activity for nitrobenzene reduction with glucose supply."

According to the news editors, the research concluded: "Dominant nitroaromatics-reducing or electrochemically active bacteria and diverse functional genes related to electrons transfer and nitroaromatics reduction were associated with nitrobenzene reduction efficiency of biocathode communities in response to carbon source switchover."

For more information on this research see: Microbial community structure and function of Nitrobenzene reduction biocathode in response to carbon source switchover. Water Research, 2014;54():137-148. Water Research can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England. (Elsevier -; Water Research -

The news editors report that additional information may be obtained by contacting B. Liang, University of California, Lawrence Berkeley Natl Lab, Div Earth Sci, Berkeley, CA 94720, United States. Additional authors for this research include H.Y. Cheng, J.D. Van Nostrand, J.C. Ma, H. Yu, D.Y. Kong, W.Z. Liu, N.Q. Ren, L.Y. Wu, A.J. Wang, D.J. Lee and J.Z. Zhou (see also Nitro Compounds).

Keywords for this news article include: Ions, Berkeley, California, Bicarbonates, Electrolytes, Hydrocarbons, United States, Nitrobenzenes, Nitro Compounds, Benzene Derivatives, Inorganic Chemicals, North and Central America

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Source: Biotech Business Week

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