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Special Issue "Recent Advances in Biotechnological Applications of Microbial Surfactants"

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A special issue of Pharmaceutics (ISSN 1999-4923). This special issue belongs to the section "Drug Targeting and Design".

Deadline for manuscript submissions: 10 November 2023 | Viewed by 2957

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Special Issue Editors

Dr. Carla Zannella

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Guest Editor

Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy
Interests: antiviral peptides; viral glycoproteins; dendrimer; natural extracts
Special Issues, Collections and Topics in MDPI journals

Dr. Rosa Giugliano

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Guest Editor

Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy
Interests: biosurfactants; antimicrobial resistance; natural products; antiviral assay; bacterial biofilm; antibacterial assay

Special Issue Information

Dear Colleagues,

The current state of emergency, driven by the spread of emerging and resistant pathogens, such as the coronavirus, has prompted the development of new strategies to combat viral, bacterial, fungal and/or parasitic infections. Microbial biosurfactants (BSs) play an important role in such efforts. BSs are surface-active compounds characterized by a hydrophilic head and a hydrophobic tail, with a huge range of biological activities, including antimicrobial, antiviral, anticancer and antioxidant properties, among others. They are utilized as ingredients in various pharmaceutical formulations, such as drugs, adjuvants for therapeutic and as an alternative to common disinfectants.

This Special Issue aims to collect original and review contributions that delve into the latest results on the benefits and applications of biosurfactants in different fields. We look forward to receiving your contributions.

Dr. Carla Zannella
Dr. Rosa Giugliano
Guest Editors

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Pharmaceutics is an international peer-reviewed open access monthly journal published by MDPI.

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Keywords

biosurfactants
antiviral
antimicrobial
microbial infections
pharmaceutical applications
natural products

Published Papers (3 papers)

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Research

Open AccessArticle

Limosilactobacillus fermentum KAU0021 Abrogates Mono- and Polymicrobial Biofilms Formed by Candida albicans and Staphylococcus aureus

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Pharmaceutics 2023, 15(4), 1079; https://doi.org/10.3390/pharmaceutics15041079 - 27 Mar 2023

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Abstract

Candida albicans and Staphylococcus aureus, representing two different kingdoms, are the most frequently isolated pathogens from invasive infections. Their pathogenic attributes, combined with drug resistance, make them a major threat and a challenge to successful treatments, mainly when involved in polymicrobial biofilm-associated infections. In the present study, we investigated the antimicrobial potential of Lactobacillus metabolite extracts (LMEs) purified from cell-free supernatant of four Lactobacillus strains (KAU007, KAU0010, KAU0021, and Pro-65). Furthermore, LME obtained from the strain KAU0021 (LME^KAU0021), being the most effective, was analyzed for its anti-biofilm property against mono- and polymicrobial biofilms formed by C. albicans and S. aureus. The impact of LME^KAU0021 on membrane integrity in single and mixed culture conditions was also evaluated using propidium iodide. The MIC values recorded for LME^KAU0021 was 406 µg/mL, 203 µg/mL, and 406 µg/mL against planktonic cells of C. albicans SC5314, S. aureus and polymicrobial culture, respectively. The LME^KAU0021 at sub-MIC values potentially abrogates both biofilm formation as well as 24 h mature mono- and polymicrobial biofilms. These results were further validated using different microscopy and viability assays. For insight mechanism, LME^KAU0021 displayed a strong impact on cell membrane integrity of both pathogens in single and mixed conditions. A hemolytic assay using horse blood cells at different concentrations of LME^KAU0021 confirmed the safety of this extract. The results from this study correlate the antimicrobial and anti-biofilm properties of lactobacilli against bacterial and fungal pathogens in different conditions. Further in vitro and in vivo studies determining these effects will support the aim of discovering an alternative strategy for combating serious polymicrobial infections caused by C. albicans and S. aureus. Full article

(This article belongs to the Special Issue Recent Advances in Biotechnological Applications of Microbial Surfactants)

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Open AccessArticle

Evaluation of Antimicrobial Properties and Potential Applications of Pseudomonas gessardii M15 Rhamnolipids towards Multiresistant Staphylococcus aureus

Carmine Buonocore

Rosa Giugliano

Gerardo Della Sala

Fortunato Palma Esposito

Pietro Tedesco

Veronica Folliero

Massimiliano Galdiero

Gianluigi Franci

and

Donatella de Pascale

Pharmaceutics 2023, 15(2), 700; https://doi.org/10.3390/pharmaceutics15020700 - 19 Feb 2023

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Abstract

Staphylococcus aureus is a Gram-positive opportunistic human pathogen responsible for severe infections and thousands of deaths annually, mostly due to its multidrug-resistant (MDR) variants. The cell membrane has emerged as a promising new therapeutic target, and lipophilic molecules, such as biosurfactants, are currently being utilized. Herein, we evaluated the antimicrobial activity of a rhamnolipids mixture produced by the Antarctic marine bacterium Pseudomonas gessardii M15. We demonstrated that our mixture has bactericidal activity in the range of 12.5–50 µg/mL against a panel of clinical MDR isolates of S. aureus, and that the mixture eradicated the bacterial population in 30 min at MIC value, and in 5 min after doubling the concentration. We also tested abilities of RLs to interfere with biofilm at different stages and determined that RLs can penetrate biofilm and kill the bacteria at sub-MICs values. The mixture was then used to functionalize a cotton swab to evaluate the prevention of S. aureus proliferation. We showed that by using 8 µg of rhamnolipids per swab, the entire bacterial load is eradicated, and just 0.5 µg is sufficient to reduce the growth by 99.99%. Our results strongly indicate the possibility of using this mixture as an additive for wound dressings for chronic wounds. Full article

(This article belongs to the Special Issue Recent Advances in Biotechnological Applications of Microbial Surfactants)

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Open AccessArticle

Assuring the Biofunctionalization of Silicone Covalently Bonded to Rhamnolipids: Antibiofilm Activity and Biocompatibility

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Pharmaceutics 2022, 14(9), 1836; https://doi.org/10.3390/pharmaceutics14091836 - 31 Aug 2022

Cited by 1 | Viewed by 1119

Abstract

Silicone-based medical devices composed of polydimethylsiloxane (PDMS) are widely used all over the human body (e.g., urinary stents and catheters, central venous catheters stents) with extreme clinical success. Nevertheless, their abiotic surfaces, being prone to microorganism colonization, are often involved in infection occurrence. Improving PDMS antimicrobial properties by surface functionalization with biosurfactants to prevent related infections has been the goal of different works, but studies that mimic the clinical use of these novel surfaces are missing. This work aims at the biofunctional assessment of PDMS functionalized with rhamnolipids (RLs), using translational tests that more closely mimic the clinical microenvironment. Rhamnolipids were covalently bonded to PDMS, and the obtained surfaces were characterized by contact angle modification assessment, ATR-FTIR analysis and atomic force microscopy imaging. Moreover, a parallel flow chamber was used to assess the Staphylococcus aureus antibiofilm activity of the obtained surfaces under dynamic conditions, and an in vitro characterization with human dermal fibroblast cells in both direct and indirect characterization assays, along with an in vivo subcutaneous implantation assay in the translational rabbit model, was performed. A 1.2 log reduction in S. aureus biofilm was observed after 24 h under flow dynamic conditions. Additionally, functionalized PDMS lessened cell adhesion upon direct contact, while supporting a cytocompatible profile, within an indirect assay. The adequacy of the biological response was further validated upon in vivo subcutaneous tissue implantation. An important step was taken towards biofunctional assessment of RLs-functionalized PDMS, reinforcing their suitability for medical device usage and infection prevention. Full article

(This article belongs to the Special Issue Recent Advances in Biotechnological Applications of Microbial Surfactants)

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