A review and roadmap for developing microbial electrochemical cell-based biosensors for recalcitrant environmental contaminants, emphasis on aromatic compounds

2021 ◽  
pp. 130245
Author(s):  
Tae Hyun Chung ◽  
Mohamed N.A. Meshref ◽  
Bipro Ranjan Dhar
1989 ◽  
Vol 24 (2) ◽  
pp. 299-322 ◽  
Author(s):  
R. M. Baxter

Abstract It is generally recognized that reductive processes are more important than oxidative ones in transforming, degrading and mineralizing many environmental contaminants. One process of particular importance is reductive dehalogenation, i.e., the replacement of a halogen atom (most commonly a chlorine atom) by a hydrogen atom. A number of different mechanisms are involved in these reactions. Photochemical reactions probably play a role in some instances. Aliphatic compounds such as chloroethanes, partly aliphatic compounds such as DDT, and alicyclic compounds such as hexachlorocyclohexane are readily dechlorinated in the laboratory by reaction with reduced iron porphyrins such as hematin. Many of these are also dechlorinated by cultures of certain microorganisms, probably by the same mechanism. Such compounds, with a few exceptions, have been found to undergo reductive dechlorination in the environment. Aromatic compounds such as halobenzenes, halophenols and halobenzoic acids appear not to react with reduced iron porphyrins. Some of these however undergo reductive dechlorination both in the environment and in the laboratory. The reaction is generally associated with methanogenic bacteria. There is evidence for the existence of a number of different dechlorinating enzymes specific for different isomers. Recently it has been found that many components of polychlorinated biphenyls (PCBs), long considered to be virtually totally resistant to environmental degradation, may be reductively dechlorinated both in the laboratory and in nature. These findings suggest that many environmental contaminants may prove to be less persistent than was previously feared.


2019 ◽  
Vol 207 (4) ◽  
pp. 493-505 ◽  
Author(s):  
R. A. Flores-Estrella ◽  
G. Rodríguez-Valenzuela ◽  
J. R. Ramírez-Landeros ◽  
V. Alcaraz-González ◽  
V. González-Álvarez

2017 ◽  
Vol 42 (3) ◽  
pp. 1308-1315 ◽  
Author(s):  
Hannah Giang ◽  
Ji Zhang ◽  
Zeying Zhu ◽  
Ian I. Suni ◽  
Yanna Liang

2012 ◽  
Vol 538-541 ◽  
pp. 2159-2163
Author(s):  
Cong Zhao ◽  
Chi Lai Chen ◽  
Dian Ling Wang ◽  
Ran Chen ◽  
You Jiang Liu ◽  
...  

Monocyclic aromatic compounds (MAC) are one kind of the major organic environmental contaminants. In this paper, with self-made high Field Asymmetry waveform Ion Mobility Spectrometry (FAIMS) system, the high resolution and sensitivity detection of typical MAC has been carried out. By analyzing the relationship between the Dispersion Voltages (DV) and Compensation Voltages (CV), the second and fourth order nonlinear ion mobility coefficients of Chlorobenzene, O-dichlorobenzene, P-dichlorobenzene, M-cresol, P-nitrophenol, Benzyl alcohol and O-Toluidine are obtained. The spectra of nonlinear ion mobility and the FAIMS spectra of seven kinds of MAC are acquired, and the high efficient separation of these substance ions are realized. As high as 0.95 of linearity and about 20 ppb detection threshold for chlorobenzene are also demonstrated by linear regression. These results show that FAIMS is an effective method to detect the MAC and has great potential for field detection of organic environmental contaminants.


2020 ◽  
Vol 451 ◽  
pp. 227817 ◽  
Author(s):  
Aref Fadakar ◽  
Mohammad Mahdi Mardanpour ◽  
Soheila Yaghmaei

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