Single cell encapsulation in a Pickering emulsion stabilized by TiO2 nanoparticles provides protection against UV radiation for a biopesticide

Feldbaum, Reut Amar; Yaakov, Noga; Mani, Karthik Ananth; Yossef, Eden; Metbeev, Sabina; Zelinger, Einat; Belausov, Eduard; Koltai, Hinanit; Ment, Dana; Mechrez, Guy

doi:10.1016/j.colsurfb.2021.111958

Cited by 21 publications

(21 citation statements)

References 45 publications

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“…These results shows that individual encapsulation is obtained when the droplet sizes and the cell sizes are of the same order of magnitude. As was also shown in our previous works ( Yaakov et al, 2018 ), ( Feldbaum et al, 2021 ). The conidia assemble at the oil phase in the water/oil biphasic system as a result of their hydrophobic surface ( Boucias and Pendland, 1998 ), ( Luke et al, 2015 ).…”

Section: Resultssupporting

confidence: 90%

“…Hence, these results are consistent with the droplet size analysis ( Figure 2 ). Both Figures 2 , 4 shows that the studied emulsions have relativity low polydispersity of the droplet size at any studied composition, which makes them suitable for conidia individual encapsulation because that the property of individual encapsulation is governed by the droplet size of the emulsions ( Yaakov et al, 2018 ), ( Feldbaum et al, 2021 ).…”

Section: Resultsmentioning

confidence: 85%

“…Titania NPs were functionalized by APTES by silanization to introduce amine groups on the surface of the NPs ( Pasternack et al, 2008 ). The silanization procedure which we have used is well established in the literature, as the resulting particle have already show their ability to serve as Pickering stabilizers for oil-in-water emulsions in our previous works ( Feldbaum et al, 2021 ). Oil-in-water Pickering emulsions stabilized by amine-functionalized titania NPs were prepared.…”

Section: Resultsmentioning

confidence: 99%

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Single-Conidium Encapsulation in Oil-in-Water Pickering Emulsions at High Encapsulation Yield

et al. 2021

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This study presents an individual encapsulation of fungal conidia in an oil-in-water Pickering emulsion at a single-conidium encapsulation yield of 44%. The single-conidium encapsulation yield was characterized by analysis of confocal microscopy micrographs. Mineral oil-in-water emulsions stabilized by amine-functionalized titania dioxide (TiO2-NH2 or titania-NH2) particles were prepared. The structure and the stability of the emulsions were investigated at different compositions by confocal microscopy and a LUMiSizer® respectively. The most stable emulsions with a droplet size suitable for single-conidium encapsulation were further studied for their individual encapsulation capabilities. The yields of individual encapsulation in the emulsions; i.e., the number of conidia that were individually encapsulated out of the total number of conidia, were characterized by confocal microscopy assay. This rapid, easy to use approach to single-conidium encapsulation, which generates a significantly high yield with eco-friendly titania-based emulsions, only requires commonly used emulsification and agitation methods.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

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Single-Conidium Encapsulation in Oil-in-Water Pickering Emulsions at High Encapsulation Yield

et al. 2021

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“…The particle layer so formed sterically hinders the approach of emulsion droplets, thereby stabilizing them against coalescence . The adsorption of particles to the interface and the superior resistance to coalescence constitute the major advantages of Pickering emulsions over conventional emulsions that are stabilized using surfactants. − …”

Section: Introductionmentioning

confidence: 99%

Fluorine-Free Superhydrophobic Coating with Antibiofilm Properties Based on Pickering Emulsion Templating

Mor

Mani

Yaakov

et al. 2021

ACS Appl. Mater. Interfaces

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This study presents antibiofilm coating formulations based on Pickering emulsion templating. The coating contains no bioactive material because its antibiofilm properties stem from passive mechanisms that derive solely from the superhydrophobic nature of the coating. Moreover, unlike most of the superhydrophobic formulations, our system is fluorine-free, thus making the method eminently suitable for food and medical applications. The coating formulation is based on water in toluene or xylene emulsions that are stabilized using commercial hydrophobic silica, with polydimethylsiloxane (PDMS) dissolved in toluene or xylene. The structure of the emulsions and their stability was characterized by confocal microscopy and cryogenic-scanning electron microscopy (cryo-SEM). The most stable emulsions are applied on polypropylene (PP) surfaces and dried in an oven to form PDMS/silica coatings in a process called emulsion templating. The structure of the resulting coatings was investigated by atomic force microscopy (AFM) and SEM. The surface of the coatings shows a honeycomb-like structure that exhibits a combination of micron-scale and nanoscale roughness, which endows it with its superhydrophobic properties. After tuning, the superhydrophobic properties of the coatings demonstrated highly efficient passive antibiofilm activity. In vitro antibiofilm trials with E. coli indicate that the coatings reduced the biofilm accumulation by 83% in the xylene–water-based surfaces and by 59% in the case of toluene–water-based surfaces.

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“…Organic UV filters are usually consisted of aromatic molecules conjugated with a carbonyl group and can absorb UV light. Inorganic UV filters, such as titanium dioxide (TiO 2 ) or zinc oxide (ZnO), can reflect, scatter, and/or absorb UV light [11,12]. However, generation of reactive oxygen species (ROS) by common sunscreen agents such as TiO 2 and ZnO has led researchers to incorporate effective antioxidant agents into sunscreens.…”

Section: Introductionmentioning

confidence: 99%

Innovative Skin Product O/W Emulsions Containing Lignin, Multiwall Carbon Nanotubes and Graphene Oxide Nanoadditives with Enhanced Sun Protection Factor and UV Stability Properties

et al. 2022

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In the present study, oil-in-water (O/W) sunscreen emulsions were prepared containing different portions of lignin (LGN), multiwall carbon nanotubes (MWCNTs) and graphene oxide (GO) nanoadditives. The stability in terms of pH and viscosity of emulsions was thoroughly studied for up to 90 days, exhibiting high stability for all produced O/W emulsions. The antioxidant activity of emulsions was also analyzed, presenting excellent antioxidant properties for the emulsion that contains LGN due to its phenolic compounds. Moreover, the emulsions were evaluated for their ultraviolet (UV) radiation protection ability in terms of sun protection factor (SPF) and UV stability. SPF values varied between 6.48 and 21.24 while the emulsion containing 2% w/v MWCNTs showed the highest SPF index and all samples demonstrated great UV stability. This work hopefully aims to contributing to the research of more organic additives for cosmetic application with various purposes.

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Single cell encapsulation in a Pickering emulsion stabilized by TiO2 nanoparticles provides protection against UV radiation for a biopesticide

Cited by 21 publications

References 45 publications

Single-Conidium Encapsulation in Oil-in-Water Pickering Emulsions at High Encapsulation Yield

Single-Conidium Encapsulation in Oil-in-Water Pickering Emulsions at High Encapsulation Yield

Fluorine-Free Superhydrophobic Coating with Antibiofilm Properties Based on Pickering Emulsion Templating

Innovative Skin Product O/W Emulsions Containing Lignin, Multiwall Carbon Nanotubes and Graphene Oxide Nanoadditives with Enhanced Sun Protection Factor and UV Stability Properties

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