Effect of Carbon and Energy Source on Bacterial Chromate Reduction

Smith, William A.; Apel, William A.; Petersen, James N.; Peyton, Brent M.

doi:10.1080/10889860290777567

Cited by 77 publications

(51 citation statements)

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“…These observations indicate that Citrus limonium shell is able to reduce Cr(VI) to Cr(III) in solution. Furthermore, as the Citrus limonium shell contains vitamin C and some carbohydrates, we found that vitamin C and cystine quickly reduce Cr(VI) to Cr(III), and could be very important part in the metal reduction, confirming some reports in the literature [2,3,37,39,40]. There are two mechanisms by which chromate could be reduced to a lower toxic oxidation state by an enzymatic reaction.…”

Section: Time Course Of Cr(vi) Decrease and Cr(iii) Productionsupporting

confidence: 74%

“…Further studies are necessary to extend our understanding of the effects of coexisting ions on the Cr(VI) reducing activity of the biomass reported in this study. Cr(VI) reducing capability has been described in some reports in the literature [2][3][4]8,13,15,18,[35][36][37][38]. Biosorption is the second mechanism by which the chromate concentration could be reduced, because the biomass shell can be regarded as a mosaic of different groups that could form coordination complexes with metals, and our observations are like to the most of the reports in the [3,4,8,13,15,18,[35][36][37][38].…”

Section: Time Course Of Cr(vi) Decrease and Cr(iii) Productionsupporting

confidence: 70%

“…Cr exists in nine valence states ranging from -2 to +6. From these, only the hexavalent [Cr(VI)] and trivalent chromium [Cr(III)] have primary environmental significance due they are the most stable oxidated forms in the environment [2]. Both are found in various bodies of water and wastewaters [3].…”

Section: Introductionmentioning

confidence: 99%

“…Cr(VI) typically exists in one of these two forms: chromate ( ) or dichromate ( ), depending on the pH of the solution [3]. These two divalent oxyanions are very water soluble and poorly adsorbed by soil and organic matter, making them mobile in soil and groundwater [2]. Both chromate anions represent acute and chronic risks to animals and human health, since they are extremely toxic, mutagenic, carcinogenic and teratogenic [4].…”

Section: Introductionmentioning

confidence: 99%

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Hexavalent Chromium Removal by Citrus limonium Shell

Vargas-Morales¹,

Bautista-Mata²,

González³

et al. 2012

OJINM

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We studied the Chromium(VI) removal capacity in aqueous solution by the lemon shell, using the diphenylcarbazide method to evaluate the metal concentration. So, the highest biosorption of the metal (50 mg/L) occurs within 100 minutes, at pH of 1.0, and 28˚C. According to temperature, the highest removal was observed at 60˚C, in 11 minutes, when the metal (1 g/L) is completely adsorbed. At the analyzed concentrations of Cr(VI), lemon shell, showed excellent removal capacity, besides it removes efficiently the metal in situ (97.2% removal, 7 days of incubation, 5 g of biomass). After 1 hour of incubation the studied biomass reduces 1.0 g of Cr(VI) with the simultaneous production of Cr(III); so it can be used to eliminate it from industrial wastewater.

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Section: Time Course Of Cr(vi) Decrease and Cr(iii) Productionsupporting

confidence: 74%

Section: Time Course Of Cr(vi) Decrease and Cr(iii) Productionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hexavalent Chromium Removal by Citrus limonium Shell

Vargas-Morales¹,

Bautista-Mata²,

González³

et al. 2012

OJINM

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show abstract

“…Cr(III) and Cr(VI) are the two most stable oxidation forms of Cr in the environment (Smith et al, 2002). Cr(III) mainly exists as hydroxides, oxides or sulphates and small amounts of it are vital for humans, animals and microorganisms.…”

Section: Introductionmentioning

confidence: 99%

FUNGICIDAL POTENTIAL OF ALLELOPATHIC WEED Cenchrus pennisetiformis ON GROWTH OF Fusarium oxysporum f. sp. lycopersici UNDER CHROMIUM STRESS

et al. 2016

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The present study was conducted to assess antifungal potential of the allelopathic grass Cenchrus pennisetiformis Hochst. & Steud. against the fungal plant pathogen Fusarium oxysporum f. sp. lycopersici (cause of tomato wilt disease) under chromium stress. Laboratory experiments were performed in 10 mL volume glass test tubes each containing 1.0 mL of malt extract broth with seven concentrations (0, 50, 100, 150, 200, 250, 300 and 350 ppm) of each of Cr(III) and Cr(VI), and two concentrations (5% and 6%) of methanolic leaf, stem or root extract of C. pennisetiformis. A metal + weed extract amended medium was inoculated with the pathogen and incubated for 7 days at 25 C. Different concentrations of Cr(III) and Cr(VI) proved equally inhibitory resulting in 10-84% and 18-89% reduction in fungal biomass, respectively. Methanolic leaf, stem and root extracts of the weed reduced fungal biomass by 12-25%, 14-23% and 46-50%, respectively, over negative control. In combined application of methanolic extracts of different parts of C. pennisetiformis and metal solutions, root extract in combination with either Cr(III) or Cr(VI) showed the highest inhibitory potential against the fungus followed by leaf and stem extracts. In combination with methanolic root, leaf and stem extracts, different concentrations of Cr(III) and Cr(VI) significantly reduced fungal biomass by 54-99%, 14-99% and 9-95%, respectively, over negative control. Such studies have not been carried out previously. Results of the present investigation suggest that F. oxysporum oxysporum f. sp. lycopersici, the cause of Fusarium wilt disease in tomato, can be managed by application of extracts (or alternatively biomass) of C. pennisetiformis in chromium contaminated soils.

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Modeling chromate reduction in Shewanella oneidensis MR‐1: Development of a novel dual‐enzyme kinetic model

Viamajala

Peyton

Petersen

2003

Biotech & Bioengineering

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Chromate (Cr(VI)) reduction tests were performed with nitrate- and fumarate-grown stationary phase cultures of Shewanella oneidensis MR-1 (henceforth referred to as MR-1) and disappearance of Cr(VI) was monitored over time. A rapid initial decrease in Cr(VI) concentration was observed, which was followed by a slower, steady decrease. These observations appear to be consistent with our previous results indicating that Cr(VI) reduction in MR-1 involves at least two mechanisms (Viamajala et al., 2002b). Modeling of metal reduction kinetics is often based on single-enzyme Michaelis-Menten equations. However, these models are often developed using initial rates and do not always match actual reduction profiles. Based on the hypothesis that multiple Cr(VI) reduction mechanisms exist in MR-1, a model was developed to describe the kinetics of Cr(VI) reduction by two parallel mechanisms: (1) a rapid Cr(VI) reduction mechanism that was deactivated (or depleted) quickly, and (2) a slower mechanism that had a constant activity and was sustainable for a longer duration. Kinetic parameters were estimated by fitting experimental data, and model fits were found to correspond very closely to quantitative observations of Cr(VI) reduction by MR-1.

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Effect of Carbon and Energy Source on Bacterial Chromate Reduction

Cited by 77 publications

References 0 publications

Hexavalent Chromium Removal by Citrus limonium Shell

Hexavalent Chromium Removal by Citrus limonium Shell

FUNGICIDAL POTENTIAL OF ALLELOPATHIC WEED Cenchrus pennisetiformis ON GROWTH OF Fusarium oxysporum f. sp. lycopersici UNDER CHROMIUM STRESS

Modeling chromate reduction in Shewanella oneidensis MR‐1: Development of a novel dual‐enzyme kinetic model

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