Physicochemical and biosorption properties of novel exopolysaccharide produced by Enterococcus faecalis

Venkatesh, Perumal; Meleppat, Balraj; Ayyanna, Repally; Ankaiah, Dasari; Arul, Venkatesan

doi:10.1016/j.lwt.2016.01.005

Cited by 47 publications

(12 citation statements)

References 34 publications

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“…Thus this glucan-like EPS may serve as a source for potential natural antioxidant; further studies are required to get a clear understanding of its astounding antioxidant capacity. Such good microbial EPS mediated antioxidant capacity is also reported previously [30,49,50]. Antioxidant property of any exopolysaccharide is usually conferred by the presence of phenolics, uronic acids or acetate groups.…”

Section: Antioxidant Propertiessupporting

confidence: 74%

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Structural and Functional Properties of Exopolysaccharide Excreted by a Novel Bacillus anthracis (Strain PFAB2) of Hot Spring Origin

et al. 2017

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Exopolysaccharide produced by a unique avirulent strain PFAB2 of hot spring origin has been characterized and its functional properties are investigated which is a first report. Maximum yield of EPS is 7.66 g/l with 2% glucose and 1% peptone as optimum carbon and nitrogen source respectively. The EPS is found to be a homopolymer consisting of only glucose as principle monosaccharide component. ThroughH NMR study, different dextran-like proton peaks are observed. Molecular weight of the EPS resembles low molecular weight bacterial origin polysaccharides. Melting transition of the EPS has started after 276 °C which indicates good thermal stability. The EPS also shows potent antioxidant activity in terms of DPPH and ABTS mediated free radical scavenging property compared to standard ascorbic acid. Emulsifying property of the EPS is also observed and has shown good emulsification of vegetable oils. The polysaccharide forms a thermo resistant gel during the heating phase, with G' higher than G″ indicating excellent shear-thinning behaviour and viscoelastic nature of the EPS.

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Section: Antioxidant Propertiessupporting

confidence: 74%

“…To determine the melting point and enthalpy change, * 5 mg of dried EPS sample has been taken in an alumina pan, sealed and analyzed, using empty pan as reference. The heating rate has been 10°C min -1 from 20 to 550°C [30].…”

Section: Thermal Characteristic Determination Of Epsmentioning

confidence: 99%

Structural and Functional Properties of Exopolysaccharide Excreted by a Novel Bacillus anthracis (Strain PFAB2) of Hot Spring Origin

et al. 2017

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“…Thermodynamically, this implies that each biosorption process would be most spontaneous or favoured at concentration with the minimum free energy (Babarinde et al, 2008). So far, results revealed that the heavy metal ions can be removed using biosorption and these findings are in line with previous studies (Bozbaş and Boz, 2016;Bulgariu and Bulgariu, 2016;Masoumi et al, 2016;Mishra et al, 2016;Pepi et al, 2016;Ramrakhiani et al, 2016;Ronda et al, 2016;Venkatesh et al, 2016;Wei et al, 2016;Zhang et al, 2016).…”

Section: ( ) = ∆ +supporting

confidence: 85%

Comparative study on batch equilibrium biosorption of Cd(II), Pb(II) and Zn(II) using plantain (Musa paradisiaca) flower: kinetics, isotherm, and thermodynamics

Int¹

2019

Preprint

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The potential of plantain (Musa paradisiaca) flower to remove Cd(II), Pb(II) and Zn(II) from aqueous solutions has been investigated under different process parameters like pH, contact time, biomass dose and initial metal ion concentration. The optimum pH for the biosorption of each of the metal ions is pH 6. The kinetic data obtained were subjected to four kinetic models, among which the pseudo-second order kinetic model was found to be the best model that describes the biosorption of each of the metal ions. The equilibrium sorption data were fitted into Langmuir, Freundlich, Temkin and D-R isotherms. In each case, the Freundlich isotherm model gave the best fit giving the sorption intensity (n) values of 1.17, 0.91 and 0.90 which indicate favourable sorption of Cd(II), Pb(II) and Zn(II), respectively. The heat of the sorption process was estimated from Temkin Isotherm model and the mean free energy was estimated from D-R isotherm model to be 312.81Jmol-1, 223.61Jmol-1 and 316.55Jmol-1 for Cd(II), Pb(II) and Zn(II), respectively. Thermodynamically, the biosorption of each of the metal ions is endothermic and the order of spontaneity of the biosorption process being Cd(II) > Zn(II) > Pb(II). Similarly, positive change in entropy was observed for each, the order of disorderliness is Cd(II) > Zn(II) = Pb(II).

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“…The broad bands at about 3,359 cm -1 represented the bonded -NH or -OH groups. The peaks near 2,928 cm -1 could be attributed to the -CH stretching [23]. The bands appearing at about 1,398 cm -1 were distributed carboxyl group (-C=O) stretching.…”

Section: Ft-ir and Sem Analysismentioning

confidence: 94%

Equilibrium and Kinetics Studies on Biosorption of Thallium (I) by Dead Biomass of Pseudomonas fluorescens

Long¹,

Chen²,

Xia³

et al. 2017

Pol. J. Environ. Stud.

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Physicochemical and biosorption properties of novel exopolysaccharide produced by Enterococcus faecalis

Cited by 47 publications

References 34 publications

Structural and Functional Properties of Exopolysaccharide Excreted by a Novel Bacillus anthracis (Strain PFAB2) of Hot Spring Origin

Structural and Functional Properties of Exopolysaccharide Excreted by a Novel Bacillus anthracis (Strain PFAB2) of Hot Spring Origin

Comparative study on batch equilibrium biosorption of Cd(II), Pb(II) and Zn(II) using plantain (Musa paradisiaca) flower: kinetics, isotherm, and thermodynamics

Equilibrium and Kinetics Studies on Biosorption of Thallium (I) by Dead Biomass of Pseudomonas fluorescens

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