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Life
Special Issues
Sources and Applications of Natural Polymers
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Sources and Applications of Natural Polymers

A special issue of Life (ISSN 2075-1729). This special issue belongs to the section "Microbiology".

Deadline for manuscript submissions: closed (25 August 2023) | Viewed by 2016

Special Issue Editor

Dr. Filomena Freitas

E-Mail Website
Guest Editor
Associate Laboratory i4HB – Institute for Health and Bioeconomy, and UCIBIO – Applied Molecular Biosciences Unit, Department of Chemistry, School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal
Interests: biological valorization of agro-industrial byproducts; microbial bioprocesses; biopolymers: production and applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Polymers of natural origin, such as polysaccharides, polyamides, and polyhydroxyalkanoates, have been extensively studied, and many are already exploited in areas ranging from commodity products to high-value medical and pharmaceutical applications. They are represented by a large variety of materials with valuable properties, originating from a wide variety of natural sources, including bacteria, fungi, plants, algae, or animals. Such biopolymers present many advantages over their synthetic counterparts given their more sustainable production processes and their biodegradability. 

Keeping in view the recent advances in biopolymer applications, this Special Issue will include a series of review and research articles covering biopolymer recovery, characterization, and applications in different areas

Dr. Filomena Freitas
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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. Life is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • biopolymer
  • polyhydroxyalkanoates
  • polysaccharide
  • polyamide
  • scaffolds
  • membranes
  • biocomposites
  • hydrogels
  • nanoparticles
  • microparticles

Published Papers (2 papers)

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Research

16 pages, 2854 KiB  
Article
Formulation of Mentha piperita-Based Nanobiopesticides and Assessment of the Pesticidal and Antimicrobial Potential
by Nazish Jahan, Nida Hussain, Syeeda Iram Touqeer, Khalil-Ur-Rahman, Huma Shamshad and Naseem Abbas
Life 2024, 14(1), 144; https://0-doi-org.brum.beds.ac.uk/10.3390/life14010144 - 19 Jan 2024
Viewed by 1013
Abstract
The excessive use of synthetic pesticides has detrimental impacts on humans, non-target organisms, and the environment. Insect pest management strategies are shifting toward biopesticides, which can provide a feasible and environmentally friendly green solution to the pest problem. The key objective of the [...] Read more.
The excessive use of synthetic pesticides has detrimental impacts on humans, non-target organisms, and the environment. Insect pest management strategies are shifting toward biopesticides, which can provide a feasible and environmentally friendly green solution to the pest problem. The key objective of the present research work was the preparation of Mentha piperita-based nanobiopesticides with enhanced stability, solubility, and pesticidal potential. Nanobiopesticides based on the Mentha piperita extract were prepared using the antisolvent precipitation method. The central composite design of response surface methodology (RSM) was utilized to optimize different process parameters, e.g., the amounts of the stabilizer and plant extract. The nanosuspension of Mentha piperita prepared with the stabilizer SLS showed a particle size of 259 nm and a polydispersity index of 0.61. The formulated biopesticides in the form of nanosuspensions showed good antibacterial activities as compared to the Mentha piperita extract against two phytopathogenic bacterial strains, Clavibacter michiganensis and Pseudomonas syringae. The M. piperita nanosuspension had higher antifungal efficacy against A. niger and F. oxysporum than the Mentha piperita extract. The M. piperita extract and its nanosuspensions were tested for pesticidal activity against the stored-grain insects Tribolium castaneum and Sitophilus oryzae. Mentha piperita-based nanobiopesticides demonstrated significantly high (p  <  0.05) average mortality of 84.4% and 77.7% against Tribolium castaneum and Sitophilus oryzae, respectively. Mentha piperita-based nanobiopesticides showed enhanced pesticidal potential and could be used as a good alternative to synthetic chemical pesticides. Full article
(This article belongs to the Special Issue Sources and Applications of Natural Polymers)
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13 pages, 4361 KiB  
Article
Microencapsulation via Spray-Drying of Geraniol-Loaded Emulsions Stabilized by Marine Exopolysaccharide for Enhanced Antimicrobial Activity
by Ichrak Joulak, Samia Azabou, Emilie Dumas, Filomena Freitas, Hamadi Attia and Adem Gharsallaoui
Life 2023, 13(10), 1958; https://0-doi-org.brum.beds.ac.uk/10.3390/life13101958 - 25 Sep 2023
Cited by 1 | Viewed by 752
Abstract
The current study investigates the formation of microencapsulated geraniol powder, with the exopolysaccharide EPS-K1B3 produced by Halomonas caseinilytica K1, as wall material, using spray-drying. Evaluation of the antimicrobial activity of the functional emulsions, prepared at either pH 5 or pH 7, was carried [...] Read more.
The current study investigates the formation of microencapsulated geraniol powder, with the exopolysaccharide EPS-K1B3 produced by Halomonas caseinilytica K1, as wall material, using spray-drying. Evaluation of the antimicrobial activity of the functional emulsions, prepared at either pH 5 or pH 7, was carried out against Gram-positive (Listeria innocua (ATCC 33090)) and Gram-negative (Escherichia coli (DSM682)) bacterial strains. Results showed prolonged antimicrobial efficacy until 30 days of incubation for geraniol microcapsules compared to wet geraniol emulsions, which could confirm the ability of the spray-drying process to protect encapsulated geraniol for a longer period. The highest antimicrobial efficacy of geraniol microcapsules was observed against L. innocua at pH 5. Therefore, the influence of pH on the functional property of geraniol microcapsules could be highlighted beside the targeted bacterial strain. Full article
(This article belongs to the Special Issue Sources and Applications of Natural Polymers)
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