A chemical equilibrium model for metal adsorption onto bacterial surfaces

Fein, Jeremy B.; Daughney, Christopher J.; Yee, Nathan; Davis, Thomas A.

doi:10.1016/s0016-7037(97)00166-x

Cited by 679 publications

(620 citation statements)

References 19 publications

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“…Although the total site densities are of the same order of magnitude, the distribution of binding groups appeared to be quite different. Gram-positive bacteria possess higher phosphoric groups (dry weight: 0.44-0.83 mmol/g) than the Gram-negative bacteria (dry weight: 0.19-0.44 mmol/g) [31] and that in our study (dry weight: 0.20 mmol/g), perhaps because its cell envelope is surrounded by a thick external layer of petidoglycan [29]. In the present study, it is clear that the carboxyl, amine, and hydroxyl groups existed at a relatively high site concentration on the fungus cell surface, which might be attributed to chitin, acidic polysaccharides, lipids, amino acids, and other components on the surface [31].…”

Section: Discussioncontrasting

confidence: 50%

“…The total site concentration (dry weight: 1.62 mmol/g; wet weight: 0.24 mmol/g obtained by recalculating to concentration of wet weight of biomass by considering the water content (about 85%) of the biomass before drying) of P. oxalicum biomass at 0.1 mol/L ionic strength (IS) was in accordance with those of Saccharomyces cerevisiae (wet weight: 0.17 mmol/g) [40], Gram-positive bacteria B. subtilis (wet weight: 0.32 mmol/g) [29], and most Gramnegative bacteria reported (dry weight: 0.078-1.66 mmol/g) [31] at the same IS. Although the total site densities are of the same order of magnitude, the distribution of binding groups appeared to be quite different.…”

Section: Discussionmentioning

confidence: 99%

“…The second site (pK a , 7.0), which showed the lowest concentration, was assigned to phosphoric groups of phospholipids [11,21]. The last two sites (pK a , 8.8 and 10.0) were assigned to amine and hydroxyl groups, respectively [21,28,29].…”

Section: Surface Characteristics Of P Oxalicum Biomassmentioning

confidence: 99%

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Binding mechanisms and QSAR modeling of aromatic pollutant biosorption on Penicillium oxalicum biomass

Wei

Huang

Yang

et al. 2011

Chemical Engineering Journal

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a b s t r a c tThe biosorption of eight aromatic compounds with different functional groups by Penicillium oxalicum biomass were investigated. The affinity of the biomass for the eight compounds at pH 6.0 follows the following trend: 1-naphthalenamine > naphthol > benzoic acid > p-toluidine > p-cresol > p-toluic acid > phenol > p-toluenesulfonic acid. Biomass surface was characterized, and it was found that four discrete binding sites, corresponding to carboxyl (pK a = 4.0), phosphoric (pK a = 7.0), amine (pK a = 8.8), and hydroxyl groups (pK a = 10.0), were identified on the biomass surface by using the linear programming method (LPM) for the fitting of the titration data and FTIR analysis. The carboxyl and amine groups dominate the biomass surface sites, which might have played an important role in biosorption of organic compounds. Furthermore, the compounds were divided into two groups based on the calculation of ionization degree for toluene derivatives and the comparison on the number of benzene rings for barely ionized compounds. It was found that low ionization degree and high hydrophobicity favor the biosorption for the two groups, respectively. Moreover, a R 2 adj of 0.724 between the log of Freundlich coefficient (log K f ) and log Kow indicated that the hydrophobicity plays role in the sorption of eight organic compounds. The QSAR model with one variable was developed for the first time between log K f and polar surface area (PSA) to predict the biosorption behaviors of organic compounds (R 2 adj = 0.960) except for ptoluenesulfonic acid (with pK a < 0), which also supported the electrostatic attraction and hydrophobicity mechanisms.

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Section: Discussioncontrasting

confidence: 50%

Section: Discussionmentioning

confidence: 99%

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Binding mechanisms and QSAR modeling of aromatic pollutant biosorption on Penicillium oxalicum biomass

Wei

Huang

Yang

et al. 2011

Chemical Engineering Journal

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“…Spatial associations between cells and precipitates that form away from the cells can be promoted through electrostatic attraction between cells and precipitates (Ams et al, 2004). Although passive binding of aqueous cations to anionic sites located within bacterial cell walls can affect the speciation and distribution of metals in bacteria-bearing systems (Beveridge and Murray, 1976;Fein et al, 1997;Kulczycki et al, 2002;Deo et al, 2010;Li and Wong, 2010), no study has demonstrated that this process affects mineral precipitation or that cell wall nucleation of precipitates can occur.…”

Section: Introductionmentioning

confidence: 99%

The effects of non-metabolizing bacterial cells on the precipitation of U, Pb and Ca phosphates

Dunham‐Cheatham

Xue

Bunker

et al. 2011

Geochimica et Cosmochimica Acta

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In this study, we test the potential for passive cell wall biomineralization by determining the effects of non-metabolizing bacteria on the precipitation of uranyl, lead, and calcium phosphates from a range of over-saturated conditions. Experiments were performed using Gram-positive Bacillus subtilis and Gram-negative Shewanella oneidensis MR-1. After equilibration, the aqueous phases were sampled and the remaining metal and P concentrations were analyzed using inductively coupled plasmaoptical emission spectroscopy (ICP-OES); the solid phases were collected and analyzed using X-ray diffractometry (XRD), transmission electron microscopy (TEM), and X-ray absorption spectroscopy (XAS).At the lower degrees of over-saturation studied, bacterial cells exerted no discernable effect on the mode of precipitation of the metal phosphates, with homogeneous precipitation occurring exclusively. However, at higher saturation states in the U system, we observed heterogeneous mineralization and extensive nucleation of hydrogen uranyl phosphate (HUP) mineralization throughout the fabric of the bacterial cell walls. This mineral nucleation effect was observed in both B. subtilis and S. oneidensis cells. In both cases, the biogenic mineral precipitates formed under the higher saturation state conditions were significantly smaller than those that formed in the abiotic controls.The cell wall nucleation effects that occurred in some of the U systems were not observed under any of the saturation state conditions studied in the Pb or Ca systems. The presence of B. subtilis significantly decreased the extent of precipitation in the U system, but had little effect in the Pb and Ca systems. At least part of this effect is due to higher solubility of the nanoscale HUP precipitate relative to macroscopic HUP. This study documents several effects of non-metabolizing bacterial cells on the nature and extent of metal phosphate precipitation. Each of these effects likely contributes to higher metal mobilities in geologic media, but the effects are not universal, and occur only with some elements and only under a subset of the conditions studied.

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“…Surface charge is dependent upon the proton condition of the external milieu. The thermodynamic controls on charge buildup and metal binding at specific microbe-solution interfaces has been studied [4,5]. For example, the uptake of Cd2', Pb2", and Cu2+ onto the cell wall of B. subtilis was greatest in a proton deficient environment (pH 6-9) with the carboxyl and phosphate groups implicated as the major sorption sites [4].…”

Section: Introductionmentioning

confidence: 99%

Actinide Biocolloid Formation in Brine by Halophilic Bacteria

et al. 1999

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JAN 2 8 ~3~ rl ABSTRACTWe examined the ability of a halophilic bacterium (WIPP 1A) isolated from the Waste Isolation Pilot Plant (WIPP) site to accumulate uranium in order to determine the potential for biocolloid facilitated actinide transport. The bacterial cell surface functional groups involved in the complexation of the actinide were determined by titration. Uranium, added as uranyl nitrate, was removed from solution at pH 5 by cells but at pH 7 and 9 very little uranium was removed due to its limited solubility. Although present as soluble species, uranyl citrate at pH 5, 7, and 9, and uranyl carbonate at pH 9 were not removed by the bacterium because they were not bioavailable due to their neutral or negative charge. Addition of uranyl EDTA to brine at pH 5, 7, and 9 resulted in the immediate precipitation of U. Transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS) analysis revealed that uranium was not only associated with the cell surface but also accumulated intracellularly as uranium-enriched granules. Extended X-ray absorption fine structure (EXAFS) analysis of the bacterial cells indicated the bulk sample contained more than one uranium phase. Nevertheless these results show the potential for the formation of actinide bearing bacterial biocolloids that are strictly regulated by the speciation and bioavailability of the actinide.

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A chemical equilibrium model for metal adsorption onto bacterial surfaces

Cited by 679 publications

References 19 publications

Binding mechanisms and QSAR modeling of aromatic pollutant biosorption on Penicillium oxalicum biomass

Binding mechanisms and QSAR modeling of aromatic pollutant biosorption on Penicillium oxalicum biomass

The effects of non-metabolizing bacterial cells on the precipitation of U, Pb and Ca phosphates

Actinide Biocolloid Formation in Brine by Halophilic Bacteria

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