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Antibacterial and Antifungal Activity of Biopolymers Modified with Ionic Liquid and Laponite

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Abstract

In the present study, the antimicrobial properties of modified biopolymers such as gelatin and agar have been investigated. These biopolymers (agar and gelatin) are modified by dissolving in ionic liquid (IL) [1-ethyl-3-methylimidazolium chloride ([C2mim][Cl]) and 1-octyl-3-methyl imidazolium chloride ([C8mim][Cl])] solutions. It was noticed that agar-ionogel (Ag-IL), gelatin-ionogel (GB-IL), and gelatin organogel (gelatin-glycerol solution along with laponite, nanoclay) nanocomposite (GA-NC) formed are highly stable, optically clear, and transparent without any air bubbles. The antimicrobial activity of these (Ag-IL), (GB-IL), and GA-NC were analyzed for both gram-negative (Escherichia coli, Klebsiella pneumoniae) and gram-positive bacterial strains (Staphylococcus aureus and Staphylococcus pyogenes) and fungus A. niger, C. albicans. Antibacterial and antifungal activity studies were carried out at different dilutions such as 100, 99, and 90 % (v/v). It was found that Ag-IL, GB-IL, and individual IL ([C8mim][Cl]) exhibited superior antimicrobial activities, indicating that longer IL chain enhance the cell membrane permeability of S. aureus, S. pyogenes, and E. coli cells. However, GA-NC nanocomposite and [C2mim][Cl]-based composites does not exhibit any bacterial inhibition activity for all bacterial strains.

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Acknowledgments

AS acknowledges University Grants Commission, Government of India for research fellowship. KR acknowledges receipt of DST Inspire Faculty Award. This work was supported by a grant received from Department of Science and Technology, Government of India and University Grants Commission for start-up grant.

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Authors and Affiliations

  1. Polymer and Biophysics Laboratory, School of Physical Sciences, Jawaharlal Nehru University, New Delhi, 110067, India

    Anshu Sharma & H. B. Bohidar

  2. Special Center for Nanosciences, Jawaharlal Nehru University, New Delhi, 110067, India

    Anshu Sharma, Prem Prakash, Kamla Rawat, Pratima R. Solanki & H. B. Bohidar

  3. Inter University Accelerator Centre (IUAC), New Delhi, 110067, India

    Kamla Rawat

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  1. Anshu Sharma
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  2. Prem Prakash
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  3. Kamla Rawat
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  4. Pratima R. Solanki
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  5. H. B. Bohidar
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Correspondence to Pratima R. Solanki or H. B. Bohidar.

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Sharma, A., Prakash, P., Rawat, K. et al. Antibacterial and Antifungal Activity of Biopolymers Modified with Ionic Liquid and Laponite. Appl Biochem Biotechnol 177, 267–277 (2015). https://doi.org/10.1007/s12010-015-1727-7

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