Characterization of exopolysaccharides after sorption of silver ions in aqueous solution

Deschatre, M.; Lescop, Benoît; Colin, Christelle Simon; Ghillebaert, F.; Guézennec, Jean; Rioual, Stéphane

doi:10.1016/j.jece.2014.09.021

Cited by 23 publications

(11 citation statements)

References 37 publications

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“…These include 3D florescence (Gao et al, 2015;Zhu et al, 2015), Fourier transform infrared spectroscopy (Yin et al, 2015), and transmission electron microscopy (Deschatre et al, 2015). These methods can be used to examine the qualitative and quantitative chemical characteristics of EPS, such as morphology and structure (Deschatre et al, 2015),…”

Section: Comparison Of Eps Extraction Protocolsmentioning

confidence: 99%

“…The error bars in (A) represent the standard deviation of EPS concentration and in (B) represent 95% confidence interval. the presence of certain chemical components (Yin et al, 2015;Zhu et al, 2015), and the estimated quantity of bound EPS (Deschatre et al, 2015). In time, it may be possible to apply these methods as part of a monitoring campaign to perform time-and cost-efficient EPS analysis.…”

Section: Figmentioning

confidence: 99%

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Effects of Activated Sludge Process Conditions on the Production of Extracellular Polymeric Substances: Results of Yearlong Monitoring in a Warm Climate

Tseng

Gori

Rosso

2015

Environmental Engineering Science

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Extracellular polymeric substances (EPS) play a key role in the activated sludge process (ASP) of wastewater treatment plants since they help bioflocculation and thus influencing sedimentation and dewatering. Previous long-term studies have examined effects of operating conditions on EPS in membrane bioreactors, while here we introduce a long-term study on activated sludge (AS) followed by gravity separation. To better understand dynamics of EPS variation and composition in the ASP, the present study focused on effects of operating conditions as well as of seasonal environmental cycles on EPS at different sampling locations along AS trains. Two ASP trains-one with full nitrification/denitrification (DN) with internal recirculation and the other with partial nitrification/DN and no recirculation-were monitored for 13 months. Results revealed that the ASP with internal recirculation had uniform EPS concentrations within the treatment train, whereas the process without internal recirculation exhibited a decreasing EPS trend along the treatment train. Concurrently, EPS concentrations in both ASP trains did not exhibit seasonality. In other words, EPS production appeared process dependent but not temperature dependent. While mean cell retention time of the AS was shown to have no effect on EPS, total inorganic nitrogen concentration from primary effluent was demonstrated to have a significant and direct relationship with EPS protein and overall EPS production.

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Section: Comparison Of Eps Extraction Protocolsmentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

Effects of Activated Sludge Process Conditions on the Production of Extracellular Polymeric Substances: Results of Yearlong Monitoring in a Warm Climate

Tseng

Gori

Rosso

2015

Environmental Engineering Science

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“…Thus, the change in the C atoms could indicate that the biosorption process is modifying the B. firmus EPS, or that the carbonyl groups are taking part in the metal ion coordination [ 28 , 39 , 40 ]. XPS analysis has previously shown that the EPS are subject to a change in their chemical structure or conformation during the biosorption process [ 16 ].…”

Section: Resultsmentioning

confidence: 99%

“…Because of their chemical and physical properties, bacterial extracellular polymeric substances (EPS) have been effectively and successfully used in the removal and recovery of several heavy metals [ 15 , 16 , 17 ]. EPS are mainly dominated by biomolecules such as carbohydrates, proteins, nucleic acids and lipids, with a lower proportion of other monomeric constituents [ 18 , 19 ] and their biosorption capacity is attributed to ionizable functional groups such as amino, carboxyl, hydroxyl, phosphate and sulfate, present mainly in polysaccharides and proteins [ 16 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Biosorption of Cadmium by Non-Toxic Extracellular Polymeric Substances (EPS) Synthesized by Bacteria from Marine Intertidal Biofilms

Camacho-Chab

Castañeda-Chávez

Chan-Bacab

et al. 2018

IJERPH

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Cadmium is a major heavy metal found in polluted aquatic environments, mainly derived from industrial production processes. We evaluated the biosorption of solubilized Cd2+ using the extracellular polymeric substances (EPS) produced by Bacillus sp. MC3B-22 and Microbacterium sp. MC3B-10 (Microbactan); these bacteria were originally isolated from intertidal biofilms off the coast of Campeche, Mexico. EPS were incubated with different concentrations of cadmium in ultrapure water. Residual Cd2+ concentrations were determined by Inductive Coupled Plasma-Optic Emission Spectrometry and the maximum sorption capacity (Qmax) was calculated according to the Langmuir model. EPS were characterized by X-ray photoelectron spectroscopy (XPS) before and after sorption. The Qmax of Cd2+ was 97 mg g−1 for Microbactan and 141 mg g−1 for MC3B-22 EPS, these adsorption levels being significantly higher than previously reported for other microbial EPS. In addition, XPS analysis revealed changes in structure of EPS after biosorption and showed that amino functional groups contributed to the binding of Cd2+, unlike other studies that show the carbohydrate fraction is responsible for this activity. This work expands the current view of bacterial species capable of synthesizing EPS with biosorbent potential for cadmium and provides evidence that different chemical moieties, other than carbohydrates, participate in this process.

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“…Similarly, silver oxide nanoparticles were not found in the AgNPs prepared with microbial EPS (using XRD) in previous studies [ 23 , 38 ]. In contract, mainly silver oxide nanoparticles were found by XRD during the biosorption of silver ions by bacterial EPS at room temperature [ 39 , 40 ]. Such differences may be due to the different experimental conditions especially the temperature since thermal treatment favors the reduction of Ag + to Ag° [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

Formation and Physiochemical Properties of Silver Nanoparticles with Various Exopolysaccharides of a Medicinal Fungus in Aqueous Solution

et al. 2016

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Natural polysaccharides are the most widely used biopolymers for green synthesis of eco-friendly silver nanoparticles (AgNPs). In a previous study, a high molecular weight (MW) fraction of exopolysaccharides (EPS) produced by a medicinal fungus Cs-HK1 has been shown useful for green and facile synthesis of AgNPs in water. This study was to further evaluate the effects of molecular properties of EPS on the formation, stability and properties of AgNPs with different EPS fractions at various pH conditions. Three EPS fractions (P0.5, P2.0 and P5.0: MW high to low and protein content low to high) were reacted with silver nitrate at various pH 3.0–8.0 in water. The most favorable pH range was 5.5–8.0 for the formation and stable dispersion of AgNPs. At a given pH, the maximum amount of AgNPs was produced with P5.0, and the minimum with P0.5. The shape, size and physiochemical properties of AgNPs were strongly affected by the molecular characteristics of EPS (MW and conformation). The results may be helpful for understanding the factors and mechanisms for formation of stable AgNPs with natural polysaccharides and the interactions between AgNPs and the polysaccharide hydrocolloids in water.

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Characterization of exopolysaccharides after sorption of silver ions in aqueous solution

Cited by 23 publications

References 37 publications

Effects of Activated Sludge Process Conditions on the Production of Extracellular Polymeric Substances: Results of Yearlong Monitoring in a Warm Climate

Effects of Activated Sludge Process Conditions on the Production of Extracellular Polymeric Substances: Results of Yearlong Monitoring in a Warm Climate

Biosorption of Cadmium by Non-Toxic Extracellular Polymeric Substances (EPS) Synthesized by Bacteria from Marine Intertidal Biofilms

Formation and Physiochemical Properties of Silver Nanoparticles with Various Exopolysaccharides of a Medicinal Fungus in Aqueous Solution

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