A novel method for the preparation of inorganic and organo-modified montmorillonite essential oil hybrids

Giannakas, Aris E.; Tsagkalias, Ioannis S.; Achilias, Dimitris S.; Ladavos, Athanasios

doi:10.1016/j.clay.2017.06.018

Cited by 59 publications

(79 citation statements)

References 42 publications

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“…This improved interplay could be explained by the similar lipophilic behavior of TO with OrgMt nanofiller. As it was shown previously (Giannakas et al, ), TO makes strong hydrogen bonds in the external surface of NaMt. In the case of modified OrgMt, the TO molecules were settled creating weaker bonds with OrgMt.…”

Section: Resultssupporting

confidence: 72%

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The effect of different preparation methods on the development of chitosan/thyme oil/montmorillonite nanocomposite active packaging films

Giannakas

Stathopoulou

Tsiamis

et al. 2019

J Food Process Preserv

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The globally increasing needs for food quantity and quality led industries to invest in packaging methods that enhance the shelf life and quality of foods. Also, the effort to avoid the use of petrochemical or chemical derivatives in the production‐chain increased the exploitation of by‐products and biomass. In this work, the raw materials such as montmorillonite (Mt), the chitosan (CS) which is a sea‐food byproduct, and the natural essential oil extract thyme oil (TO) were combined via two different methods for the development of an advanced nanocomposite active packaging film for foods. In the first method, the so‐called “Solution‐Blending” (SB), a CS/TO solution was blended with sodium–montmorillonite (NaMt) or organomodified‐montmorillonite (OrgMt). In the second method, the so‐called “ModifiedClay” (MC), the TO was adsorbed into NaMt or OrgMt and the produced hybrid was added to CS. The tests indicated that nanocomposite films which were prepared via the MC method are promising materials for active packaging films. Practical applications Nowadays, a lot of effort is spent on finding advanced food conservation methods which extend shelf time, increase quality, and vanish the food odor problems. This study shows that films which are prepared via the modified clay method exhibit high antioxidant behavior and high antimicrobial activity against Escherichia coli. Also, tests on under‐vacuum packaged chicken breast fillets exhibit low lipid oxidation values. Thus, these films/pads are promising for active packaging applications of meat and other food products.

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Section: Resultssupporting

confidence: 72%

“…The modification of NaMt and OrgMt with TO was performed using a novel adsorption evaporation method (Giannakas, Tsagkalias, Achilias, & Ladavos, 2017). The nominal content ratio of the used TO over the modified clay was adjusted to 0.8:1 w/w.…”

Section: Modification Of Clays With Tomentioning

confidence: 99%

The effect of different preparation methods on the development of chitosan/thyme oil/montmorillonite nanocomposite active packaging films

Giannakas

Stathopoulou

Tsiamis

et al. 2019

J Food Process Preserv

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“…These methods are subject to drawbacks, such as the need for a further drying step and the possible presence of organic solvent residues. Very recently, a vapour adsorption method comparable to the method described in the present paper was documented for use with oregano, thyme and basil essential oils . The proposed mechanism of encapsulation is not adsorption of EOCs into the interlayers but onto the surface via hydrogen bonding.…”

Section: Discussionmentioning

confidence: 92%

“…Very recently, a vapour adsorption method comparable to the method described in the present paper was documented for use with oregano, thyme and basil essential oils. 41 The proposed mechanism of TA B L E 3 Minimal inhibitory concentration (μg/mL) for mycelial growth of were observed between empty MMT and MMT-EOCs, with a shift at 2θ = 7°, suggesting at least partial intercalation of the EOC molecules between the layers of the phyllosilicate structure. Intercalation is also supported by the porosimetry results, which indicated significant filling of the pores.…”

Section: Discussionmentioning

confidence: 99%

The efficacy of essential oil components loaded into montmorillonite against Aspergillus niger and Staphylococcus aureus

Bernardos

Božík

Álvarez

et al. 2019

Flavour & Fragrance J

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Essential oil components (EOCs) are potent natural antimicrobial agents, but their high volatility and reactivity limit their potential applications. Here, we report the preparation of a series of nanomaterials containing EOCs (i.e., allyl isothiocyanate, carvacrol, cinnamaldehyde, diallyl disulphide, eugenol and thymol). The materials were prepared by simple adsorption of the EOCs onto a montmorillonite nanoclay. The antimicrobial activities of these materials were assessed against Aspergillus niger and Staphylococcus aureus as typical models of agricultural fungal pathogens and foodborne bacterial pathogens, respectively. In addition, the activities of the encapsulated EOCs were compared with those of the corresponding free forms with or without Tween‐80 in two types of assays: microdilution assays for determining the minimum inhibitory concentration (MIC) and agar‐based assays mimicking surface treatment. Enhanced antifungal activity of the encapsulated form was observed for all EOCs. In addition, against S. aureus, the MICs of all EOCs were remarkably lower in encapsulated form than in free form. These results indicate that EOCs encapsulated in low‐cost nanoclays have favourable potential as antimicrobials compared with the pure compounds.

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“…It has been demonstrated that thermal stability and color fastness can be improved by the hybridization of pigments with different nanoclay structures [13][14][15][16]. Depending on the nanoclay exchange capacity, some surface modifications should be needed, such as the use of surfactants [17][18][19] or silane couple agents to open the nanoclays structure and improve their adsorption capacity. Additionally, it has been proved that other additives used with natural dyes, such as mordant salts, can improve the natural dye-nanoclay interactions [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Lemon Waste Natural Dye and Essential Oil Loaded into Laminar Nanoclays on Thermomechanical and Color Properties of Polyester Based Bionanocomposites

et al. 2020

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In this work, polyester-based nanocomposites added with laminar nanoclays (calcined hydrotalcite, HT, and montmorillonite, MMT) loaded with lemon waste natural dye (LD) and essential oil (LEO) were prepared and characterized. The optimal conditions to synthetize the hybrid materials were obtained by using statistically designed experiments. The maximum LD adsorption with HT was found using 5 wt% of surfactant (sodium dodecyl sulfate), 5 wt% of mordant (aluminum potassium sulfate dodecahydrate) and 50% (v/v) ethanol. For MMT, 10 wt% of surfactant (cetylpyridinium bromide), 5 wt% of mordant, 1 wt% of (3-aminopropyl) triethoxysilane and 100% distilled water were used. LEO adsorption at 300 wt% was maximized with MMT, 10 wt% of surfactant and 50 °C following an evaporation/adsorption process. The obtained hybrid nanofillers were incorporated in a polyester-based matrix (INZEA) at different loadings (3, 5, and 7 wt%) and the obtained samples were characterized in terms of thermal stability, tensile behavior, and color properties. HT_LEM-based samples showed a bright yellow color compared to MMT_LEM ones. The presence of lemon hybrid pigments in INZEA-based systems produced a remarkable variation in CIELAB color space values, which was more visible with increasing the nanofillers ratio. A limited mechanical enhancement and reduced thermal stability was observed with the nanopigments addition, suggesting a limited extent of intercalation/exfoliation of MMT and HT in the polymer matrix. MMT_LEM pigments showed higher thermal stability than HT_LEM ones. A significant increase in Young’s modulus of nanocomposites loaded with hybrid LEO was observed compared to the biopolymer matrix. The LEO inclusion into the nanoclays efficiently improved its thermal stability, especially for MMT.

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A novel method for the preparation of inorganic and organo-modified montmorillonite essential oil hybrids

Cited by 59 publications

References 42 publications

The effect of different preparation methods on the development of chitosan/thyme oil/montmorillonite nanocomposite active packaging films

The effect of different preparation methods on the development of chitosan/thyme oil/montmorillonite nanocomposite active packaging films

The efficacy of essential oil components loaded into montmorillonite against Aspergillus niger and Staphylococcus aureus

Effect of Lemon Waste Natural Dye and Essential Oil Loaded into Laminar Nanoclays on Thermomechanical and Color Properties of Polyester Based Bionanocomposites

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