Effect of pH on uranium(VI) biosorption and biomineralization by Saccharomyces cerevisiae

Zheng, Xinghua; Shen, Yinglin; Wang, X.Y.; Wang, T.S.

doi:10.1016/j.chemosphere.2018.03.165

Cited by 55 publications

(21 citation statements)

References 26 publications

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“…In order to determine the influence of KS5 on the immobilization capacity of uranium at natural conditions, uranium removal studies were performed at pH 5.0. Several previous studies demonstrate that the optimum pH value for uranium immobilization by fungal biomass is between 4.0 and 6.0 [ 61 – 63 ]. Due to the relation of biosorption to the number of negative surface groups, which is depending on the dissociation of these functional groups, this phenomenon could be explained.…”

Section: Resultsmentioning

confidence: 99%

Metabolism-dependent bioaccumulation of uranium by Rhodosporidium toruloides isolated from the flooding water of a former uranium mine

et al. 2018

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Remediation of former uranium mining sites represents one of the biggest challenges worldwide that have to be solved in this century. During the last years, the search of alternative strategies involving environmentally sustainable treatments has started. Bioremediation, the use of microorganisms to clean up polluted sites in the environment, is considered one the best alternative. By means of culture-dependent methods, we isolated an indigenous yeast strain, KS5 (Rhodosporidium toruloides), directly from the flooding water of a former uranium mining site and investigated its interactions with uranium. Our results highlight distinct adaptive mechanisms towards high uranium concentrations on the one hand, and complex interaction mechanisms on the other. The cells of the strain KS5 exhibit high a uranium tolerance, being able to grow at 6 mM, and also a high ability to accumulate this radionuclide (350 mg uranium/g dry biomass, 48 h). The removal of uranium by KS5 displays a temperature- and cell viability-dependent process, indicating that metabolic activity could be involved. By STEM (scanning transmission electron microscopy) investigations, we observed that uranium was removed by two mechanisms, active bioaccumulation and inactive biosorption. This study highlights the potential of KS5 as a representative of indigenous species within the flooding water of a former uranium mine, which may play a key role in bioremediation of uranium contaminated sites.

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Section: Resultsmentioning

confidence: 99%

Metabolism-dependent bioaccumulation of uranium by Rhodosporidium toruloides isolated from the flooding water of a former uranium mine

et al. 2018

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“…In the case of Serratia sp., biomineralization entails the activity of both alkaline and acidic phosphatases (Newsome et al, 2015; Chandwadkar et al, 2018), as well as an indigenous bentonite microbial population (Povedano-Priego et al, 2019). Moreover, fungal U biomineralization has also been described by Aspergillus niger and Paecilomyces javanicus (Liang et al, 2015) or Saccharomyces cerevisiae (Zheng et al, 2018). In addition, phosphate mineral formation by several yeast strains may involve an organic source of phosphorus such as glycerol 2-phosphate or phytic acid, in the presence of soluble U (Liang et al, 2016).…”

Section: Microbial Interactions With Radionuclidesmentioning

confidence: 99%

Microbial interaction with and tolerance of radionuclides: underlying mechanisms and biotechnological applications

López-Fernández

Jroundi

Ruiz-Fresneda

et al. 2020

Microbial Biotechnology

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Radionuclides (RNs) generated by nuclear and civil industries are released in natural ecosystems and may have a hazardous impact on human health and the environment. RN-polluted environments harbour different microbial species that become highly tolerant of these elements through mechanisms including biosorption, biotransformation, biomineralization and intracellular accumulation. Such microbial-RN interaction processes hold biotechnological potential for the design of bioremediation strategies to deal with several contamination problems. This paper, with its multidisciplinary approach, provides a state-of-theart review of most research endeavours aimed to elucidate how microbes deal with radionuclides and how they tolerate ionizing radiations. In addition, the most recent findings related to new biotechnological applications of microbes in the bioremediation of radionuclides and in the long-term disposal of nuclear wastes are described and discussed.

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“…For many years, S. cerevisiae has been studied as a biosorbent of organic compounds such as dyes (Mahmoud, ), pesticides and herbicides (Tunçeli et al ., ), as well as of inorganic compounds such as metals (Hadiani et al ., ; Zheng et al ., ). However, a new application of S. cerevisiae as a biosorbent of secondary metabolites from industrial waste has recently emerged, demonstrating that this approach is promising for the recovery of biocompounds (Stafussa et al ., ; Rubio et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Saccharomyces cerevisiae biosorbed with grape pomace flavonoids: adsorption studies and in vitro simulated gastrointestinal digestion

Oliveira

Maciel

Rossetto

et al. 2019

Int J of Food Sci Tech

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The residual Saccharomyces cerevisiae from brewing was used as a biosorbent of flavonoids of hydro alcoholic extract from samples of grape pomace (Merlot and Tannat). Biosorption assays verified that the pseudo-second order kinetic model and the Dubinin-Raduschkevich isotherm model presented the best fit, with free energy of adsorption (E) of 7.1 and 6.5 kJ for the Merlot and Tannat varieties, respectively, indicating that the yeast has many binding sites and adsorption was a physical process. The analysis of microscopy and spectroscopy showed differences in structure and composition of the yeast after biosorption, demonstrating that the application was effective, which was confirmed by the chromatographic analysis, where a reduction in 17% and 50% in the catechin peak was observed in the Merlot and Tannat samples, respectively. Finally, there was an increase in the in vitro bioaccessibility of flavonoids in 68% for the Merlot sample and 88% for Tannat, reaching the main objective of this application. Determination of biosorption kineticsAs described by Stafussa et al. (2016), to perform biosorption kinetics, 125 mL Erlenmeyer flasks containing 50 mg of yeast S. cerevisiae (dry weight), and 12.5 mL of solution of grape pomace hydroalcoholic extract were used. The flasks were shaken at 130 r.p.m. and 25°C, and samples were taken at

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Effect of pH on uranium(VI) biosorption and biomineralization by Saccharomyces cerevisiae

Cited by 55 publications

References 26 publications

Metabolism-dependent bioaccumulation of uranium by Rhodosporidium toruloides isolated from the flooding water of a former uranium mine

Metabolism-dependent bioaccumulation of uranium by Rhodosporidium toruloides isolated from the flooding water of a former uranium mine

Microbial interaction with and tolerance of radionuclides: underlying mechanisms and biotechnological applications

Saccharomyces cerevisiae biosorbed with grape pomace flavonoids: adsorption studies and in vitro simulated gastrointestinal digestion

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