Emulsion electrospinning of bicomponent poly (vinyl pyrrolidone)/gelatin nanofibers with thyme essential oil

Çallıoğlu, Funda Cengiz; Güler, Hülya Kesici; Çetin, Emel Sesli

doi:10.1088/2053-1591/ab5387

Cited by 25 publications

(20 citation statements)

References 63 publications

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“…So far a wide variety of essential oils have been electrospun, including cinnamon [39][40][41][42][43][44], oregano [45][46][47][48], peppermint [44,[49][50][51][52], clove [41,[53][54][55][56][57], thyme [58][59][60][61], lavender [62][63][64], eucalyptus [65], ginger [66], tea tree [67,68], Manuka [68], black pepper [69], and sage [69]. This review focuses on works that report the addition of EOs to polymeric solutions before conducting the electrospinning process.…”

Section: Electrospun Fibres Containing Eos and Their Applicationsmentioning

confidence: 99%

“…Recently, thyme EO has been encapsulated into fibres of poly(vinylpyrrolidone (PVP) and gelatine (average diameter between 200 and 400 nm) by performing the electrospinning process at a voltage of 25 kV, a flow rate of 0.5 mL/hour and electrodes distance of 17 cm [61]. PVP/gelatine fibrous mats containing 3% w/w of thyme EO were tested against S. aureus, E. coli, P. aeruginosa, and E. faecalis, and inhibition zones of 16 mm were recorded for both S. aureus and E. coli; smaller zones (11-12 cm) were instead measured for the other microorganisms.…”

Section: Thyme Essential Oilmentioning

confidence: 99%

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Electrospinning of Essential Oils

Mele

2020

Polymers

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The extensive and sometimes unregulated use of synthetic chemicals, such as drugs, preservatives, and pesticides, is posing big threats to global health, the environment, and food security. This has stimulated the research of new strategies to deal with bacterial infections in animals and humans and to eradicate pests. Plant extracts, particularly essential oils, have recently emerged as valid alternatives to synthetic drugs, due to their properties which include antibacterial, antifungal, anti-inflammatory, antioxidant, and insecticidal activity. This review discusses the current research on the use of electrospinning to encapsulate essential oils into polymeric nanofibres and achieve controlled release of these bioactive compounds, while protecting them from degradation. The works here analysed demonstrate that the electrospinning process is an effective strategy to preserve the properties of essential oils and create bioactive membranes for biomedical, pharmaceutical, and food packaging applications.

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Section: Electrospun Fibres Containing Eos and Their Applicationsmentioning

confidence: 99%

Section: Thyme Essential Oilmentioning

confidence: 99%

Electrospinning of Essential Oils

Mele

2020

Polymers

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“…The solidification of the polymer increases its density, displacing the emulsified oil droplets towards the center of the polymer jet and, therefore, the oil tends to be located in a central channel, after which coalescence of the droplets occurs. As a result of the fusion of these droplets, the core is finally generated and the polymer from the aqueous phase surrounds it, forming the shell [ 13 , 15 , 16 ]. During the electrospinning process, the solvent in the near-surface region evaporates faster than the central part of the polymer, leading to a rapid increase in the viscosity of the outer layer compared to that of the inner layer.…”

Section: Introductionmentioning

confidence: 99%

Liquid Oil Trapped inside PVA Electrospun Microcapsules

et al. 2022

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Electrospinning makes it possible to obtain solid fibers, in addition to core-shell fibers, using coextrusion. However, an exhaustive control of parameters allows the core-shell fibers from emulsion electrospinning to be obtained. The solvent in the outer surface tends to evaporate and the polymer density increases, moving the emulsion drops towards the center, which in turn promotes coalescence, thus creating the core. The aim of this work was to avoid coalescence and obtain a net of nanofibers entrapping oil microcapsules. We obtained an emulsion oil in water (O/W), with polyvinyl alcohol (W) and two essential oils (O), sage and thyme. An electrospinning process was used to place the microcapsules of oil inside a net of nanofibers. The electrospun veil was characterized by organoleptic testing, SEM microscopy, FTIR spectroscopy, DSC thermal analysis, and pressure tests. Organoleptic testing, FTIR spectroscopy, and DSC thermal analysis demonstrated the presence of the oil, which was retained in the spheres observed by SEM microscopy, while pressure tests revealed that the oil remained in a liquid state. Furthermore, we demonstrated a strong relationship between the emulsion size and the final microcapsules created, which are slightly larger due to the shell formation. The size of the emulsion determines whether the spheres will be independent or embedded in the nanofibers. Furthermore, the nanofiber diameter was considerably reduced compared to the nanofibers without the oil.

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“…110 As expected, biological studies confirmed the antibacterial effect of the electrospun mat starting from concentrations of 2 wt% of essential oil after 24 h. In a follow-up study using thyme essential oil as active component and gelatin/PVP for improved durability, a similar spinning behavior was observed. 111 Fiber morphology changed from beaded to smooth fibers with increasing oil content; however, a concentration of 5 wt% and more led to issues in spinnability and stability of the membranes. The optimal membrane of this study contained 3 wt% of the active component, showing antibacterial properties for up to 8 days.…”

Section: Dispersion Electrospinningmentioning

confidence: 99%