Microencapsulation of thyme oil by coacervation

Martins, Isabel Pavão; Rodrigues, S. Sofia M.; Barreiro, María Filomena; Rodrigues, Alirio.

doi:10.1080/02652040802646599

Cited by 14 publications

(35 citation statements)

References 2 publications

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“…On the other hand the Cryogenic Scanning Electron Microscopy (Cryo-SEM) image confirmed the rough surface of PLA microcapsules with some visible pinholes, cracks and pores (see, Fig. 10(b)) [37]. Furthermore, the PLA mem-brane covering the thyme oil is clearly exposed as depicted by the Laser Scanning Confocal Microscopy (LSCM) image (Fig.…”

Section: Diffusion Characteristics Of Poly(lactic Acid) Microcapsulesmentioning

confidence: 58%

“…The thyme oil -core is not labeled (black) and the PLApolymer layer is labeled with Coumarin 6 (green). Through this figure it was possible to corroborate reservoir-type of PLA microcapsules produced according the method developed by Martins et al where Coumarin 6 was added to the PLA solution [37]. The release rate of thyme oil, as described in the work of Mast-romatteo et al [127] dealing with the study of active food packaging, is affected by film thickness and polymer concentration [127].…”

Section: Diffusion Characteristics Of Poly(lactic Acid) Microcapsulesmentioning

confidence: 86%

“…For example, Fig. 10 shows optical and cryogenic scanning electron microscopy images of PLA microcapsules with thyme oil reported by Martins et al [37,56,96]. Images obtained through optical microscopy demonstrate that droplets of thyme oil have been individually encapsulated as spherical particles with-out noticeable agglomeration.…”

Section: Diffusion Characteristics Of Poly(lactic Acid) Microcapsulesmentioning

confidence: 99%

See 2 more Smart Citations

Microencapsulation of essential oils with biodegradable polymeric carriers for cosmetic applications

Martins

Barreiro

Coelho

et al. 2014

Chemical Engineering Journal

272

160

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Microencapsulation provides an important tool for cosmetic and/or pharmaceutical industry, enabling protection and controlled release of several active agents. The encapsulation of essential oils in core-shell or matrix particles has been investigated for various reasons, e.g., protection from oxidative decomposition and evaporation, odor masking or merely to act as support to ensure controlled release. A large number of microencapsulation methods have been developed in order to be adapted to different types of active agents and shell materials, generating particles with a variable range of sizes, shell thicknesses and permeability, providing a tool to modulate the release rate of the active principle. With this work, an overview regarding properties and applications of essential oils and biodegradable polymers in the cosmetic field, focusing the use of polylactide as the base material to encapsulate thyme oil, as well as of microencapsulation processes with a particular emphasis on the coacervation, will be presented.2

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Section: Diffusion Characteristics Of Poly(lactic Acid) Microcapsulesmentioning

confidence: 58%

Section: Diffusion Characteristics Of Poly(lactic Acid) Microcapsulesmentioning

confidence: 86%

Section: Diffusion Characteristics Of Poly(lactic Acid) Microcapsulesmentioning

confidence: 99%

See 1 more Smart Citation

Microencapsulation of essential oils with biodegradable polymeric carriers for cosmetic applications

Martins

Barreiro

Coelho

et al. 2014

Chemical Engineering Journal

272

160

View full text Add to dashboard Cite

show abstract

“…Finally, it might also be interesting to analyse the microencapsulation of other bioactive essential oils such as thyme oil. In the work by Martins et al (2009) thyme oil was microencapsulated within a polylactide shell by a coaservation methodology to produce microcapsules with diameters between 29 and 42 μm in diameter, with an oil content between 30 and 65 % depending on the type and concentration of surfactant utilized. According to what has been described in the literature for microencapsulation of essential oils, our system produces microcapsules with diameters within the range obtained in other publications and a total lipid content (51 %) better that what has been reported by Leimann et al (2009), but there might still be room for improvements in both smaller microcapsule size and larger oil contents (Hogan et al 2001b).…”

Section: Resultsmentioning

confidence: 99%

Edible antimicrobial films based on microencapsulated lemongrass oil

Bustos

Matiacevich

2015

J Food Sci Technol

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Edible films and coatings have been proposed as viable alternatives for the preservation of fresh food such as fruit, meat, fish and cheese. They can be designed to contain natural antioxidants, vitamins and antimicrobials in order to extend shelf life of the product keeping the natural sensorial properties. Essential oils have been targeted as potential active principles for edible films and coatings given their wellrecognized antioxidant, antimicrobial and sensory properties. In the present work, lemongrass oil (LMO) microcapsules were prepared by the emulsification-separation method using sodium caseinate as wall material. Microcapsules had an average size of 22 μm and contained over 51 % oil in their nucleus. The release kinetics of the LMO components was studied for both, microcapsules and microcapsule containing films. Experimental data for the controlled release of LMO components showed good correlation with Peppas and Weibull models. The effect of the alginate matrix on the release parameters of the mathematical models could be detected by the modification of the b constant of the Weibull equation which changed from 0.167 for the microcapsules to 0.351 for the films. Films containing LMO at concentrations of 1250, 2500 and 5000 ppm were able to inhibit growth of Escherichia coli ATCC 25922 and Listeria monocytogenes ISP 65-08 in liquid cultures. A possible future application of these films for shelf life extension of fresh food is discussed.

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“…To the best of our knowledge, up to today, lemon and orange oil [138]; fish oil [147][148][149]; peppermint oil [150,151]; thyme oil [152]; sunflower oil [153]; cinnamon oil [154]; coriander oil [155]; lavender oil [156]; coffee oil [157]; flaxseed oil [158], olive oil [159]; palm oil [160]; citronella oil [139] and kiwi fruit seed oil [161] were successfully microencapsulated by coacervation technique. However, it should be noted that the composition of every oil substantially varies and this difference majorly affects the efficiency of coacervation method [162,163].…”

Section: Coacervationmentioning

confidence: 99%

A Review on Encapsulation of Oils

Özbek¹,

Ergönül²

2017

Celal Bayar Üniversitesi Fen Bilimleri Dergisi

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Heat, oxygen, moisture and light are the main causes of oxidation reactions in lipid containing foods. In particular, lipid oxidation is a major problem for unsaturated lipids. Until recent years, natural or synthetic antioxidants have been widely used in oils to retard oxidative deteriorations. Nowadays, encapsulation of oils like other sensitive materials such as vitamins, colorants, phenolic compounds or probiotic bacteria by various techniques have become increasingly popular as a promising preservation method. On the other hand, encapsulation improves handling properties of oils as well as protecting oils against oxidation. Spray drying is the most preferred encapsulation technique due to its lower operating costs and simplicity. Freeze-drying, coacervation and emulsification are the other well-known encapsulation methods. However, process parameters of these methods have extremely important effect on storage stability of encapsulated oils. As for encapsulated oils by drying, also the characteristics of powder products are greatly influenced by process variables. Many studies have been carried out to optimize process factors for encapsulation of oils with a maximum efficiency. In this review, common practices used for oil encapsulation and the oxidative stability of encapsulated oils are discussed in detail. Furthermore, effects of environmental conditions on storage stability of encapsulated oils during storage are also reviewed.

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Microencapsulation of thyme oil by coacervation

Cited by 14 publications

References 2 publications

Microencapsulation of essential oils with biodegradable polymeric carriers for cosmetic applications

Microencapsulation of essential oils with biodegradable polymeric carriers for cosmetic applications

Edible antimicrobial films based on microencapsulated lemongrass oil

A Review on Encapsulation of Oils

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