Antimicrobial zein coatings plasticized with garlic and thyme essential oils

Pereira, Lívio Antônio Silva; Silva, Priscila de Castro e; Pagnossa, Jorge Pamplona; Miranda, Kelvi Wilson Evaristo; Medeiros, Eliton S.; Píccoli, Roberta Hilsdorf; Oliveira, Juliano Elvis de

doi:10.1590/1981-6723.13518

Cited by 17 publications

(9 citation statements)

References 37 publications

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“…The smaller cracks were probably caused by the relatively fragile zein films structure. To a greater extent, a similar phenomenon was observed in the study by Pereira et al [ 13 ]. Two phases were shown in the surface morphology of the zein films [ 11 ], indicating that the phase separation process occurred between the polymer and plasticizer (glycerol).…”

Section: Resultssupporting

confidence: 86%

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Zein-Based Films Containing Monolaurin/Eugenol or Essential Oils with Potential for Bioactive Packaging Application

Sedlaříková

Janalíková

Peer

et al. 2021

IJMS

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Zein is renewable plant protein with valuable film-forming properties that can be used as a packaging material. It is known that the addition of natural cross-linkers can enhance a film’s tensile properties. In this study, we aimed to prepare antimicrobial zein-based films enriched with monolaurin, eugenol, oregano, and thyme essential oil. Films were prepared using the solvent casting technique from ethanol solution. Their physicochemical properties were investigated using structural, morphological, and thermal techniques. Polar and dispersive components were analyzed using two models to evaluate the effects on the surface free energy values. The antimicrobial activity was proven using a disk diffusion method and the suppression of bacterial growth was confirmed via a growth kinetics study with the Gompertz function. The films’ morphological characteristics led to systems with uniform distribution of essential oils or eugenol droplets combined with a flat-plated structure of monolaurin. A unique combination of polyphenolic eugenol and amphiphilic monoglyceride provided highly stretchable films with enhanced barrier properties and efficiency against Gram-positive and Gram-negative bacteria, yeasts, and molds. The prepared zein-based films with tunable surface properties represent an alternative to non-renewable resources with a potential application as active packaging materials.

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Section: Resultssupporting

confidence: 86%

“…Similarly, in the work by Pereira et al [ 13 ], the drop in elongation values was monitored after the incorporation of thyme and garlic essential oils into the zein matrix. This effect could be the consequence of porous structure formation in the polymer film.…”

Section: Resultsmentioning

confidence: 96%

Zein-Based Films Containing Monolaurin/Eugenol or Essential Oils with Potential for Bioactive Packaging Application

Sedlaříková

Janalíková

Peer

et al. 2021

IJMS

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“…Pereira et al investigated the antimicrobial and thermal properties of zein composites. The TGA spectra of zein composites are in good agreement with the results of present research [31].…”

Section: Study Of Sem Ftir and Tgasupporting

confidence: 91%

Zein/EDTA/chlorophyll/nano-clay Biocomposite Sorbent: Investigation Physicochemical Properties Sorbent and Its Ability to Remove Contaminants of Industrial Wastewater

Asadzadeh

Pirsa

2021

J Polym Environ

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In this study, a composite biosorbent of zein/ethylene diamine tetraacetic acid/chlorophyll/nano-clay (Ze/EDTA/Chl/Clay) was prepared. Thickness, mechanical properties (tensile strength and strength to breaking point), ability to reduce water hardness, water solubility, water absorption, antioxidant activity and moisture content of prepared biosorbent were studied. SEM, FTIR, XRD and TGA techniques were used to investigate the physicochemical properties and structure of the prepared biosorbent. Optimal biosorbent was selected using statistical methods and used to remove chemical contaminants from industrial wastewater in Urmia (Iran). For this purpose, total heavy metals (THM), total hardness, nitrate, nitrite, COD and BOD, TDS and salinity of industrial wastewater before and after biosorbent treatment were investigated. The results confirmed the homogeneous and cohesive structure of different zein adsorbents. FTIR results showed physical and electrostatic interactions between composite components. Nanoclay increased the thermal stability of the biosorbent. Chlorophyll and EDTA increased the biosorbent ability to absorb water and reduce the total hardness of the water. Clay nanoparticles increased the tensile strength of the biosorbent and chlorophyll and EDTA increased the biosorbent ductility. Under optimal wastewater treatment conditions, Ze/EDTA/Chl/Clay biosorbent was recognized as the best adsorbent. The use of ultrasound in wastewater treatment had a good effect. Under optimal conditions, 57.5% of THM and 67% of nitrate were removed from the wastewater. By comparing the ability of chlorophyll-containing biosorbents (Ze/Chl and Ze/EDTA/Chl/Clay) to remove nitrite and nitrate, it was found that these biosorbents have a very high selectivity in nitrate removal compared to nitrite.

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“…Increasing LO minimized the interaction forces of the rosin components, generating an inhomogeneous structure and lowering the firmness of the gel. The addition of oil reduced the film’s mechanical properties owing to the plasticizing effect of oil [ 42 ]. Actually, a formulation should not be too hard in order for it to deform and fit well with the periodontal pocket with time [ 8 ].…”

Section: Resultsmentioning

confidence: 99%

Lime Peel Oil–Incorporated Rosin-Based Antimicrobial In Situ Forming Gel

Khaing

Mahadlek

Okonogi

et al. 2022

Gels

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Localized intra-periodontal pocket drug delivery using an injectable in situ forming gel is an effective periodontitis treatment. The aqueous insoluble property of rosin is suitable for preparing a solvent exchange-induced in situ forming gel. This study aims to investigate the role of incorporating lime peel oil (LO) on the physicochemical properties of injectable in situ forming gels based on rosin loaded with 5% w/w doxycycline hyclate (DH) in dimethyl sulfoxide (DMSO) and N-methyl pyrrolidone (NMP). Their gel formation, viscosity, injectability, mechanical properties, wettability, drug release, and antimicrobial activities were evaluated. The presence of LO slowed gel formation due to the loose precipitate formation of gel with a high LO content. The viscosity and injectability were slightly increased with higher LO content for the DH-loaded rosin-based in situ forming gel. The addition of 10% LO lowered gel hardness with higher adhesion. LO incorporation promoted a higher drug release pattern than the no oil-added formulation over 10 days and the gel formation rate related to burst drug release. The drug release kinetics followed the non-Fickian diffusion mechanism for oil-added formulations. LO exhibited high antimicrobial activity against Porphyromonas gingivalis and Staphylococcus aureus. The DH-loaded rosin in situ forming gel with an addition of LO (0, 2.5, 5, and 10% w/w) inhibited all tested microorganisms. Adding 10% LO to rosin-based in situ forming gel improved the antimicrobial activities, especially for the P. gingivalis and S. aureus. As a result, the study demonstrates the possibility of using an LO amount of less than 10% loading into a rosin-based in situ forming gel for efficient periodontitis treatment.

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Antimicrobial zein coatings plasticized with garlic and thyme essential oils

Cited by 17 publications

References 37 publications

Zein-Based Films Containing Monolaurin/Eugenol or Essential Oils with Potential for Bioactive Packaging Application

Zein-Based Films Containing Monolaurin/Eugenol or Essential Oils with Potential for Bioactive Packaging Application

Zein/EDTA/chlorophyll/nano-clay Biocomposite Sorbent: Investigation Physicochemical Properties Sorbent and Its Ability to Remove Contaminants of Industrial Wastewater

Lime Peel Oil–Incorporated Rosin-Based Antimicrobial In Situ Forming Gel

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