Flocculation efficiency of the Sinorhizobium meliloti 1021 exopolysaccharide relative to mineral oxide suspensions – A preliminary study for wastewater treatment

Szewczuk-Karpisz, Katarzyna; Wiśniewska, Małgorzata

doi:10.1016/j.seppur.2018.02.028

Cited by 10 publications

(3 citation statements)

References 38 publications

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“…They discovered that when extracted EPSs were used as sole coagulant materials, they had a high removal efficiency and that when alum was added to bacterial EPSs, the removal efficiency increased. Recently, Szewczuk-Karpisz & Wiśniewska [ 163 ] studied the Sinorhizobium meliloti 1021 EPS flocculation efficiency relative to mineral oxide suspensions (Cr 2 O 3 , SiO 2 , and ZrO 2 ). Their data verified the application of S. meliloti EPS in wastewater treatment as a potential flocculant related to these solids.…”

Section: Applications Of Microbial Epss Related To the Marine Environ...mentioning

confidence: 99%

Potential functions and applications of diverse microbial exopolysaccharides in marine environments

Ibrahim

Elhassayeb

El-Sayed

2022

Journal of Genetic Engineering and Biotechnology

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Exopolysaccharides (EPSs) from microorganisms are essential harmless natural biopolymers used in applications including medications, nutraceuticals and functional foods, cosmetics, and insecticides. Several microbes can synthesize and excrete EPSs with chemical properties and structures that make them suitable for several important applications. Microbes secrete EPSs outside their cell walls, as slime or as a “jelly” into the extracellular medium. These EPS-producing microbes are ubiquitous and can be isolated from aquatic and terrestrial environments, such as freshwater, marine water, wastewater, and soils. They have also been isolated from extreme niches like hot springs, cold waters, halophilic environments, and salt marshes. Recently, microbial EPSs have attracted interest for their applications such as environmental bio-flocculants because they are degradable and nontoxic. However, further efforts are required for the cost-effective and industrial-scale commercial production of microbial EPSs. This review focuses on the exopolysaccharides obtained from several extremophilic microorganisms, their synthesis, and manufacturing optimization for better cost and productivity. We also explored their role and applications in interactions between several organisms.

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Section: Applications Of Microbial Epss Related To the Marine Environ...mentioning

confidence: 99%

Potential functions and applications of diverse microbial exopolysaccharides in marine environments

Ibrahim

Elhassayeb

El-Sayed

2022

Journal of Genetic Engineering and Biotechnology

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“…According to the previous studies, an extracellular polysaccharide from some bacterial species ( Paenibacillus polymyxa , Sinorhizobium meliloti 1021, Klebsiella sp. J1) can remove heavy metals, including Cd (II), Pb (II), Cu (II), Zn (II), As (III), Cr (III) and Cr (VI) (Huang et al 2019 ; Szewczuk-Karpisz and Wisniewska 2018 ; Wei et al 2018 ). However, high production costs and low yields cause a bottleneck for the application of EPS to be flocculant (Smith and Miettinen 2006 ).…”

Section: Introductionmentioning

confidence: 99%

Hyperproduction of extracellular polymeric substance in Pseudomonas fluorescens for efficient chromium (VI) absorption

Yang

Chen

Zhang

et al. 2023

Bioresour. Bioprocess.

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A novel extracellular polymeric substance (EPS) with flocculating activity produced by Pseudomonas fluorescein isolated from soil was studied in this paper. Firstly, atmospheric and room temperature plasma (ARTP) was applied to get a mutant of P. fluorescein with higher EPS production. A mutant T4-2 exhibited a 106.48% increase in flocculating activity compared to the original strain. The maximum EPS yield from T4-2 was enhanced up to 6.42 g/L, nearly 10 times higher than the original strain on a 3.6-L bioreactor with optimized fermentation conditions. Moreover, the flocculating activity of the mutant reached 3023.4 U/mL, 10.96-fold higher than that of T4. Further identification showed that EPS from mutant T4-2 was mainly composed of polysaccharide (76.67%) and protein (15.8%) with a molecular weight of 1.17 × 105 Da. The EPS showed excellent adsorption capacities of 80.13 mg/g for chromium (VI), which was much higher than many reported adsorbents such as chitosan and cellulose. The adsorption results were described by Langmuir isotherm and pseudo-second-order kinetic model. The thermodynamic parameters (ΔG0, ΔH0 and ΔS0) revealed that the adsorption process was spontaneous and exothermic. Adsorption mechanisms were speculated to be electrostatic interaction, reduction, and chelation. Graphical Abstract

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mentioning

confidence: 99%

Hyperproduction of extracellular polymeric substance in Pseudomonas fluorescens for efficient Chromium (VI) absorption

Yang

Chen

Zhang

et al. 2022

Preprint

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A novel extracellular polymeric substance (EPS) with flocculating activity produced by Pseudomonas fluorescein isolated from soil was studied in this paper. Firstly, atmospheric and room temperature plasma (ARTP) was applied to get a mutant of P. fluorescein with higher EPS production. A mutant T4-2 exhibited a 106.48% increase in flocculating activity compared to the original strain. The maximum EPS yield from T4-2 was enhanced up to 6.42 g/L, nearly 10 times higher than the original strain on a 3.6-L fermentor with optimized fermentation conditions. Moreover, the flocculating activity of the mutant reached 3023.4 U/mL, 10.96-fold higher than that of T4. Further identification showed that EPS from T4-2 was mainly composed of polysaccharide (76.67%) and protein (15.8%) with a molecular weight of 1.17×105 Da. The EPS showed excellent adsorption capacities of 80.13 mg/g for chromium (Ⅵ), which was much higher than many reported adsorbents such as chitosan and cellulose. The adsorption results were described by Langmuir isotherm and pseudo-second order kinetic model. The thermodynamic parameters (ΔG0, ΔH0 and ΔS0) revealed that the adsorption process was spontaneous and exothermic. Adsorption mechanisms were speculated to be electrostatic interaction, reduction, and chelation.

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Flocculation efficiency of the Sinorhizobium meliloti 1021 exopolysaccharide relative to mineral oxide suspensions – A preliminary study for wastewater treatment

Cited by 10 publications

References 38 publications

Potential functions and applications of diverse microbial exopolysaccharides in marine environments

Potential functions and applications of diverse microbial exopolysaccharides in marine environments

Hyperproduction of extracellular polymeric substance in Pseudomonas fluorescens for efficient chromium (VI) absorption

Hyperproduction of extracellular polymeric substance in Pseudomonas fluorescens for efficient Chromium (VI) absorption

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