Preparation of Thymus vulgaris Essential Oil Microcapsules by Complex Coacervation and Direct Emulsion: Synthesis, Characterization and Controlled Release Properties

Chaib, Samira; Benali, Nejib; Arhab, Rabah; Ajmi, Insaf Sadraoui; Bendaoued, Houcine; Romdhane, Mehrez

doi:10.1007/s13369-020-05223-w

Cited by 18 publications

(16 citation statements)

References 65 publications

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“…MCC was characterized by absorption peaks in the range 3000–3700 cm −1 and at 902 cm −1 , attributed to the presence of OH groups; at 2891 cm −1 and 1024 cm −1 , attributed to C–H stretching vibration and at 1636 cm −1 , attributed to the vibration of O-H bending of adsorbed water molecules [ 34 , 35 ]. TY FTIR spectra were characterized by absorption peaks at 3000–3500 cm −1 , attributed to the presence of phenolic O-H; at 2865, 2926, 2958 and 2968 cm −1 , attributed to a C-H bond and at 1418 and 1459 cm −1 , attributed to C–H stretching vibrations [ 36 ]. The presence of an aromatic ring in TY was exhibited by its C-C stretching at 1622 cm −1 [ 33 ].…”

Section: Resultsmentioning

confidence: 99%

Encapsulation of Thymol and Eugenol Essential Oils Using Unmodified Cellulose: Preparation and Characterization

et al. 2022

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Essential oils (EOs) are volatile natural organic compounds, which possess pesticidal properties. However, they are vulnerable to heat and light, limiting their range of applications. Encapsulation of EOs is a useful approach to overcome some of these limitations. In this study, a novel emulsification technique is utilized for encapsulation of thymol (TY) and eugenol (EU) (EOs) within microcapsules with an unmodified cellulose shell. Use of low cost materials and processes can be beneficial in agricultural applications. In the encapsulation process, unmodified cellulose was dissolved in 7% aqueous NaOH at low temperature, regenerated to form a dispersion of cellulose hydrogels, which was rigorously mixed with the EOs by mechanical mixing followed by high-pressure homogenization (HPH). Cellulose:EO ratios of 1:1 and 1:8 utilizing homogenization pressures of 5000, 10,000 and 20,000 psi applied in a microfluidizer were studied. Light microscopy, high-resolution cryogenic scanning electron microscopy (cryo-SEM) and Fourier transform infrared spectroscopy (FTIR) revealed successful fabrication of EO-loaded capsules in size range of 1 to ~8 µm. Stability analyses showed highly stabilized oil in water (O/W) emulsions with instability index close to 0. The emulsions exhibited anti-mold activity in post-harvest alfalfa plants, with potency affected by the cellulose:EO ratio as well as the EO type; TY showed the highest anti-mold activity. Taken together, this study showed potential for anti-fungal activity of cellulose-encapsulated EOs in post-harvest hay.

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Section: Resultsmentioning

confidence: 99%

Encapsulation of Thymol and Eugenol Essential Oils Using Unmodified Cellulose: Preparation and Characterization

et al. 2022

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“…The strength and thermal stability of microcapsules can be enhanced by crosslinking curing reaction. Transglutaminase [15] and aldehydes, such as formaldehyde [16] and glutaraldehyde [17,18], are usually used as crosslinking agents. The principle of crosslinking curing reaction between gelatin and glutaraldehyde is shown in Fig 7 .There are a large number of amino groups on gelatin, The carbonyl group of glutaraldehyde can react with the amino group of gelatin, cross-linking the amino groups on the gelatin chain to form a network of polymers, to achieve the effect of curing.…”

Section: Influence Of Ph On Thermal Stability Of Crosslinked Curing R...mentioning

confidence: 99%

Preparation and properties of n-hexane microcapsules by complex coacervation

Chen¹,

Li²,

Miao³

2023

AETR

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In order to improve the encapsulation efficiency of low density core material microcapsules, the complex condensation method was used to prepare microcapsules with n-hexane as the core material and gelatin and Arabic gum as the wall material.For n-hexane with low density, the influence of wall material concentration on microcapsule morphology, the influence of core wall ratio on microcapsule wall thickness, the influence of emulsifying speed on emulsifying effect, the influence of crosslinking curing reaction pH on thermal stability, and the influence of complex coacervation pH on turbidity were studied by turbidimetric titration. The experimental results show that: For the low-density core microcapsules, the spherical multi-core microcapsules prepared are regular in capsule shape, but the encapsulation efficiency is lower than 30%, and the waste of wall material is serious. The wall material concentration is 2%, the core-to-wall ratio is 3:1, the emulsification speed is 10000 r/min, the pH of complex oacervation is 4.0, and the pH of crosslinking curing reaction is 10.0. The microcapsules prepared on this basis are monocytic and irregular. Although the shape and phase of the capsules are irregular, they have good encapsulation effect, with the yield up to 71.86% and encapsulation efficiency up to 70%. Meanwhile, they have good thermal stability.

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“…Dried samples of chitosan: gum Arabic and chitosan: gum Arabic: essential oils at two ratio (1:1:0.2; 1:1:0.5) were analyzed. The analysis was accomplished as cited by Chaib et al (2021). Each spectrum was recorded in a frequency range of 4000-400 cm -1 with a resolution of 4 cm -1 .…”

Section: Ftir Characterizationmentioning

confidence: 99%

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2022

TJPP

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Preparation of Thymus vulgaris Essential Oil Microcapsules by Complex Coacervation and Direct Emulsion: Synthesis, Characterization and Controlled Release Properties

Cited by 18 publications

References 65 publications

Encapsulation of Thymol and Eugenol Essential Oils Using Unmodified Cellulose: Preparation and Characterization

Encapsulation of Thymol and Eugenol Essential Oils Using Unmodified Cellulose: Preparation and Characterization

Preparation and properties of n-hexane microcapsules by complex coacervation

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