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Biosurfactants: Current Research Trends and Applications

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Informatics".

Deadline for manuscript submissions: closed (30 September 2021) | Viewed by 2373

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Guest Editor
Department of Chemical Sciences, Università degli Studi di Napoli Federico II, Naples, Italy
Interests: fungal proteins; proteic biosurfactants; surface modification; hydrophobins; functional amyloids
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Chemical Sciences, University of Naples “Federico II”, Via Cintia 4, I-80126 Naples, Italy
Interests: protein recombinant expression; biosensing; protein immobilization, fungal laccase
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Biosurfactants can be defined as the surface-active biomolecules produced by microorganisms. The coexistence of hydrophilic and hydrophobic domains in the same molecule, renders them able to (i) reach interfaces, (ii) lower interfacial tension and (iii) form micelle. Biosurfactants are produced by several variety of bacteria and few fungi and are categorized by their molecular weight. There are low molecular weight molecules as glycolipids, lipo-peptides, fatty acids, phospholipids and high molecular consisting in polymers and proteins.

With the respect to the chemical surfactants, biosurfactants display lower toxicity, higher biodegradability, better environmental compatibility. Due to their unique functional properties, biosurfactants can be used as emulsifiers, wetting agents, foaming agents, spreading agents, functional food ingredients and detergents in several industries including agrochemicals, fertilizers, foods, beverages, cosmetics, pharmaceuticals and many others.

The aim of this Special Issue is to focus on some of the most recent and interesting aspects of the research about biosurfactants and on their multifaceted applications.

Prof. Paola Giardina
Dr. Alessandra Piscitelli
Guest Editors

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Keywords

  • Tensioactive molecules
  • Surface adhesion
  • Antimicrobial activity
  • Antibiofilm activity
  • Emulsions
  • Drug delivery

Published Papers (1 paper)

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Research

18 pages, 6407 KiB  
Article
Rhamnolipids as Effective Green Agents in the Destabilisation of Dolomite Suspension
by Krzysztof Jan Legawiec, Mateusz Kruszelnicki, Anna Bastrzyk and Izabela Polowczyk
Int. J. Mol. Sci. 2021, 22(19), 10591; https://doi.org/10.3390/ijms221910591 - 30 Sep 2021
Cited by 4 | Viewed by 1825
Abstract
In this paper, we describe an application of mono- and dirhamnolipid homologue mixtures of a biosurfactant as a green agent for destabilisation of a dolomite suspension. Properties of the biosurfactant solution were characterised using surface tension and aggregate measurements to prove aggregation of [...] Read more.
In this paper, we describe an application of mono- and dirhamnolipid homologue mixtures of a biosurfactant as a green agent for destabilisation of a dolomite suspension. Properties of the biosurfactant solution were characterised using surface tension and aggregate measurements to prove aggregation of rhamnolipids at concentrations much lower than the critical micelle concentration. Based on this information, the adsorption process of biosurfactant molecules on the surface of the carbonate mineral dolomite was investigated, and the adsorption mechanism was proposed. The stability of the dolomite suspension after rhamnolipid adsorption was investigated by turbidimetry. The critical concentration of rhamnolipid at which destabilisation of the suspension occurred most effectively was found to be 50 mg·dm−3. By analysing backscattering profiles, solid-phase migration velocities were calculated. With different amounts of biomolecules, this parameter can be modified from 6.66 to 20.29 mm·h−1. Our study indicates that the dolomite suspension is destabilised by hydrophobic coagulation, which was proved by examining the wetting angle of the mineral surface using the captive bubble technique. The relatively low amount of biosurfactant used to destabilise the system indicates the potential application of this technology for water treatment or modification of the hydrophobicity of mineral surfaces in mineral engineering. Full article
(This article belongs to the Special Issue Biosurfactants: Current Research Trends and Applications)
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