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Characterization of Exopolysaccharide Produced by Pseudomonas sp. PFAB4 for Synthesis of EPS-Coated AgNPs with Antimicrobial Properties.

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Title: Characterization of Exopolysaccharide Produced by Pseudomonas sp. PFAB4 for Synthesis of EPS-Coated AgNPs with Antimicrobial Properties.
Authors: Banerjee, Aparna1,2 (AUTHOR), Das, Debasis3 (AUTHOR), Rudra, Shalini Gaur4 (AUTHOR), Mazumder, Koushik5 (AUTHOR), Andler, Rodrigo6 (AUTHOR), Bandopadhyay, Rajib1 (AUTHOR) rajibindia@gmail.com
Source: Journal of Polymers & the Environment. Jan2020, Vol. 28 Issue 1, p242-256. 15p.
Subject Terms: *Gram-negative bacteria, Atomic force microscopy, Silver nanoparticles, Metal nanoparticles, Hot springs, Quinazolinones
Abstract: Thermal ecosystems like hot springs are exclusive habitat of thermotolerant microorganisms that produce exopolysaccharides (EPS). In this study, EPS produced by a hot spring origin Pseudomonas species is structurally elucidated.The EPS is highly thermostable (Td 289.98 °C), has low molecular weight (1510 Da) and is rhamnoglucose type consisting α-(1 → 3) linked to L-Rhap and α-(1 → 6) linked to d-Glc substituted with O-acetyl groups. Irregular EPS sheets with smooth surface were observed that signify the compact structure of the biopolymer; a characteristic plasticized film-like feature. Intra- and inter-molecular aggregation of EPS units are observed in atomic force microscopy. The EPS showed good rheological property at neutral pH. EPS-mediated green synthesis of silver nanoparticles (AgNP) was performed using co-precipitation method. Size of individual AgNPs had a Z-average of 93.6 nm and 0.437 polydispersity index. The EPS-coated AgNPs were moderately monodisperse. These AgNPs also exhibited biocidal property preferentially against gram negative bacteria and some fungi. Incorporating EPS to the metal nanoparticles confers them biocompatibility. Green synthesis of silver nanoparticles has gained considerable attention for its eco-friendliness in nano-medicine and nano-biotechnology. Keeping in context, the results of our study will support a new polysaccharide-mediated green synthesis approach of metal nanoparticles that shows profound antimicrobial property. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Polymers & the Environment is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Characterization of Exopolysaccharide Produced by Pseudomonas sp. PFAB4 for Synthesis of EPS-Coated AgNPs with Antimicrobial Properties.
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  Data: <searchLink fieldCode="AR" term="%22Banerjee%2C+Aparna%22">Banerjee, Aparna</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Das%2C+Debasis%22">Das, Debasis</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rudra%2C+Shalini+Gaur%22">Rudra, Shalini Gaur</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mazumder%2C+Koushik%22">Mazumder, Koushik</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Andler%2C+Rodrigo%22">Andler, Rodrigo</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bandopadhyay%2C+Rajib%22">Bandopadhyay, Rajib</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> rajibindia@gmail.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Polymers+%26+the+Environment%22">Journal of Polymers & the Environment</searchLink>. Jan2020, Vol. 28 Issue 1, p242-256. 15p.
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  Data: *<searchLink fieldCode="DE" term="%22Gram-negative+bacteria%22">Gram-negative bacteria</searchLink><br /><searchLink fieldCode="DE" term="%22Atomic+force+microscopy%22">Atomic force microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Silver+nanoparticles%22">Silver nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+nanoparticles%22">Metal nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Hot+springs%22">Hot springs</searchLink><br /><searchLink fieldCode="DE" term="%22Quinazolinones%22">Quinazolinones</searchLink>
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  Data: Thermal ecosystems like hot springs are exclusive habitat of thermotolerant microorganisms that produce exopolysaccharides (EPS). In this study, EPS produced by a hot spring origin Pseudomonas species is structurally elucidated.The EPS is highly thermostable (Td 289.98 °C), has low molecular weight (1510 Da) and is rhamnoglucose type consisting α-(1 → 3) linked to L-Rhap and α-(1 → 6) linked to d-Glc substituted with O-acetyl groups. Irregular EPS sheets with smooth surface were observed that signify the compact structure of the biopolymer; a characteristic plasticized film-like feature. Intra- and inter-molecular aggregation of EPS units are observed in atomic force microscopy. The EPS showed good rheological property at neutral pH. EPS-mediated green synthesis of silver nanoparticles (AgNP) was performed using co-precipitation method. Size of individual AgNPs had a Z-average of 93.6 nm and 0.437 polydispersity index. The EPS-coated AgNPs were moderately monodisperse. These AgNPs also exhibited biocidal property preferentially against gram negative bacteria and some fungi. Incorporating EPS to the metal nanoparticles confers them biocompatibility. Green synthesis of silver nanoparticles has gained considerable attention for its eco-friendliness in nano-medicine and nano-biotechnology. Keeping in context, the results of our study will support a new polysaccharide-mediated green synthesis approach of metal nanoparticles that shows profound antimicrobial property. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Polymers & the Environment is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10924-019-01602-z
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        Type: general
      – SubjectFull: Atomic force microscopy
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      – SubjectFull: Silver nanoparticles
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      – SubjectFull: Hot springs
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      – SubjectFull: Quinazolinones
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      – TitleFull: Characterization of Exopolysaccharide Produced by Pseudomonas sp. PFAB4 for Synthesis of EPS-Coated AgNPs with Antimicrobial Properties.
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            NameFull: Banerjee, Aparna
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            NameFull: Das, Debasis
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              Text: Jan2020
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              Y: 2020
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