Chitosan/cashew gum nanogels for essential oil encapsulation

Abreu, Flávia Oliveira Monteiro da Silva; Oliveira, Erick F. de; Paula, Haroldo C.B.; Paula, Regina C.M. de

doi:10.1016/j.carbpol.2012.04.048

Cited by 211 publications

(101 citation statements)

References 29 publications

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“…As the core/(core+wall) ratio increased, EE increased significantly (positive coefficient of X 1 ). A possible explanation for this was that only a fixed amount of OMC was probably lost to the external phase during the formation of microcapsules and this loss obviously had a more detrimental effect on EE with relatively lower drug content [28] . After reaching a maximum level, EE started to decline slightly as the core/wall ratio was further increased.…”

Section: Resultsmentioning

confidence: 99%

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Preparation and Characterization of Microcapsules Encapsulating Octyl Methoxycinnamate by Complex Coacervation

Zhao¹

2016

ijps

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Zhao, et al.,: Octyl Methoxycinnamate-loaded MicrocapsulesThe aim of this study was to entrap the lipophilic ultraviolet absorber, octyl methoxycinnamate in microcapsuels to enhance its application. A complex coacervation method was established. Through the appearance of encapsulated glass beads prepared with different wall materials, gelatin and sodium polyphosphate were selected as wall materials because of dense structure and less adhesion. The effects of three variables, core/ (core+wall) ratio, pH at complex coacervation, and amount of cross-linking agent, on encapsulation efficiency were studied. Response surface methodology was employed to optimize the technology, and a polynomial regression model equation was generated. The optimization method enabled to predict the response variable value within the experimental range with good agreement between the predicted and experimental values. The microcapsules under the optimized conditions appeared spherical in shape with smooth nonporous surface and no tendency to aggregation. The photodegradation percentage of octyl methoxycinnamate after exposing to ultraviolet irradiation was determined and the transdermal permeation pattern of octyl methoxycinnamate and its photodegradation product from various formulations was estimated in vitro. From the results obtained, the microcapsules had achieved decreasing transdermal permeation of octyl methoxycinnamate and its photodegradation product, enhancing the accumulation of the sunscreen at the administration site, and then increasing the protection effect and safety. This study revealed the potential of sunscreen microcapsules as new skin drug delivery systems.

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Section: Resultsmentioning

confidence: 99%

“…In general encapsulation process, core material is usually oil drop for the emulsifying process and then covered by wall material in the succeeding stage to complete the microcapsules [18,28] . However, it is remarkably difficult to observe the structure and thickness of coating ingredient.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Microcapsules Encapsulating Octyl Methoxycinnamate by Complex Coacervation

Zhao¹

2016

ijps

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“…Such polymers mainly consist of polysaccharides (e.g., chitosan, alginates and starch) and polyesters (e.g., poly-ε-caprolactone and polyethylene glycol). In recent years, there has been an increase in demand for biodegradable materials of biological origin such as beeswax, corn oil, ecithin (Nguyen et al 2012 ) or cashew gum (Abreu et al 2012 ). These eco-friendly matrices can be applied in organic crop production with no toxic effects.…”

Section: Nano-pesticides and Pest Controlmentioning

confidence: 99%

Understanding the Role of Nanomaterials in Agriculture

Dwivedi

Saquib

Al‐Khedhairy

et al. 2016

Microbial Inoculants in Sustainable Agricultural Productivity

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Nanotechnology offers immense opportunities for improvement in the quality of life through applications in agriculture and the food systems. Development of nanotechnology-based novel agro-products, viz., nanosensors, nano-fertilizers, nano-pesticides and nanoformulations of biocontrol agents, is currently a subject of intense investigation. A variety of nanomaterials has been recommended for use in agriculture, in order to help reduce the consumption of agrochemicals by use of smart delivery systems, minimize the nutrient losses and increase the yield through optimized water and nutrients management. Nanotechnology-derived devices have also been explored in the areas of plant breeding and genetics. Additionally, the agricultural products and/or by-products can be utilized as a source for developing bio-nanocomposites. Nevertheless, the potential advantages of nanotechnology applications in the agricultural sector are still marginal, and have not been commercialized to a signifi cant extent, as compared to other industrial sectors. Researches in the area of agricultural nanotechnology are being extensively pursued in quest for the solutions to the agricultural and environmental challenges, such as sustainability, increased productivity, disease management and crop protection through innovative techniques for monitoring, assessing and controlling the agricultural practices. This chapter provides a basic knowledge about the role of nanotechnology in developing sustainable agriculture and environment, and eventually in the welfare of human society, at large, in the near future.

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“…A different approach is the hydrogel based oil encapsulation in which gelation of the stabilizing biopolymer layer forms a protective coating around the oil droplets prior to freeze drying. Examples of gelled chitosan layers in encapsulation can be found in literature [99][100][101].…”

Section: Applicationsmentioning

confidence: 99%

Chitosan: Gels and Interfacial Properties

et al. 2015

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Abstract:Chitosan is a unique biopolymer in the respect that it is abundant, cationic, low-toxic, non-immunogenic and biodegradable. The relative occurrence of the two monomeric building units (N-acetyl-glucosamine and D-glucosamine) is crucial to whether chitosan is predominantly an ampholyte or predominantly a polyelectrolyte at acidic pH-values. The chemical composition is not only crucial to its surface activity properties, but also to whether and why chitosan can undergo a sol-gel transition. This review gives an overview of chitosan hydrogels and their biomedical applications, e.g., in tissue engineering and drug delivery, as well as the chitosan's surface activity and its role in emulsion formation, stabilization and destabilization. Previously unpublished original data where chitosan acts as an emulsifier and flocculant are presented and discussed, showing that highly-acetylated chitosans can act both as an emulsifier and as a flocculant.

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Chitosan/cashew gum nanogels for essential oil encapsulation

Cited by 211 publications

References 29 publications

Preparation and Characterization of Microcapsules Encapsulating Octyl Methoxycinnamate by Complex Coacervation

Preparation and Characterization of Microcapsules Encapsulating Octyl Methoxycinnamate by Complex Coacervation

Understanding the Role of Nanomaterials in Agriculture

Chitosan: Gels and Interfacial Properties

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