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3. Microencapsulation of essential oils by single and coaxial electrospraying in poly ε-caprolactone microcapsules: characterization and oil release behavior.

Author

Pardini, Francisco M., Faccia, Paula A., Amalvy, Javier I., Gonzalez, Alba, and Irusta, Lourdes

Subjects
*ESSENTIAL oils, *MICROENCAPSULATION, *PETROLEUM, *THERMAL properties, *TERPENES
Abstract

Electrospraying is a versatile, high-efficiency method for synthesizing microcapsules (MCs) with many applications. In this study, a single and a coaxial nozzle were used to prepare poly (ε-caprolactone) (PCL) MCs. The aim of this work was to investigate the influence of the encapsulation technique (single electrospraying (SE) and coaxial electrospraying (CE)) on morphology, particle size, chemical interactions, thermal properties, encapsulation efficiency, and release behavior. Thus, two natural oils with an insect-repellence effect (citronella and eucalyptus) were encapsulated in PCL MCs by means of SE and by CE. Spectroscopy, thermal, and microscopy characterizations of the MCs were performed. Oil encapsulation efficiency (EE) and release studies were also made. Spherical MCs with a mean diameter of 7–10 µm were obtained. Characterization techniques showed the presence of citronella and eucalyptus in the MCs and the chemical interactions between the polymer and the oils. In addition, higher encapsulation efficiency was achieved by CE for both oils. For MCs obtained by SE, a higher mass of oil released was observed compared to the capsules obtained by CE. Two released mechanisms were obtained in the systems depending on the oil used. The possibility of using MCs with different characteristics allows greater versatility of the particles. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Microencapsulation of essential oils by single and coaxial electrospraying in poly ε-caprolactone microcapsules: characterization and oil release behavior

Author

Pardini, Francisco M., Faccia, Paula A., Amalvy, Javier I., Gonzalez, Alba, and Irusta, Lourdes

Abstract

Electrospraying is a versatile, high-efficiency method for synthesizing microcapsules (MCs) with many applications. In this study, a single and a coaxial nozzle were used to prepare poly (ε-caprolactone) (PCL) MCs. The aim of this work was to investigate the influence of the encapsulation technique (single electrospraying (SE) and coaxial electrospraying (CE)) on morphology, particle size, chemical interactions, thermal properties, encapsulation efficiency, and release behavior. Thus, two natural oils with an insect-repellence effect (citronella and eucalyptus) were encapsulated in PCL MCs by means of SE and by CE. Spectroscopy, thermal, and microscopy characterizations of the MCs were performed. Oil encapsulation efficiency (EE) and release studies were also made. Spherical MCs with a mean diameter of 7–10 µm were obtained. Characterization techniques showed the presence of citronella and eucalyptus in the MCs and the chemical interactions between the polymer and the oils. In addition, higher encapsulation efficiency was achieved by CE for both oils. For MCs obtained by SE, a higher mass of oil released was observed compared to the capsules obtained by CE. Two released mechanisms were obtained in the systems depending on the oil used. The possibility of using MCs with different characteristics allows greater versatility of the particles.

Published
2023
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6. Acomodación

Author

Faccia, Paula Andrea, Toledo, Florencia Emilia, Faccia, Paula Andrea, and Liberatore, Luis Ernesto

Subjects
purl.org/becyt/ford/3.3 [https], OPTOMETRIA, OPTICA, purl.org/becyt/ford/3 [https], PROCEDIMIENTOS CLÍNICOS
Abstract

El Manual práctico: optometría clínica es un documento orientado a dar asistencia durante el aprendizaje de la práctica clínica optométrica, con el objeto de mejorar la experiencia de formación profesional de los alumnos. La obra toma como eje la historia clínica, para guiar al lector en el proceso de atención en salud visual, resaltando sus conceptos fundamentales. Fil: Faccia, Paula Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas; Argentina

Published
2020

7. Diagnóstico y disposición clínica: prescripción, conducta y controles

Author

Faccia, Paula Andrea, Toledo, Florencia Emilia, Faccia, Paula Andrea, and Liberatore, Luis Ernesto

Subjects
purl.org/becyt/ford/3.3 [https], OPTOMETRIA, OPTICA, PROCEDIMIENTOS CLINICOS, purl.org/becyt/ford/3 [https]
Abstract

El Manual práctico: optometría clínica es un documento orientado a dar asistencia durante el aprendizaje de la práctica clínica optométrica, con el objeto de mejorar la experiencia de formación profesional de los alumnos. La obra toma como eje la historia clínica, para guiar al lector en el proceso de atención en salud visual, resaltando sus conceptos fundamentales. Fil: Faccia, Paula Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas; Argentina

Published
2020

8. Sintomatología Ocular

Author

Faccia, Paula Andrea, Toledo, Florencia Emilia, Faccia, Paula Andrea, and Liberatore, Luis

Subjects
purl.org/becyt/ford/3.3 [https], OPTICA, purl.org/becyt/ford/3 [https], PROCEDIMIENTOS CLÍNICOS, OPTOMETRÍA
Abstract

El Manual práctico: optometría clínica es un documento orientado a dar asistencia durante el aprendizaje de la práctica clínica optométrica, con el objeto de mejorar la experiencia de formación profesional de los alumnos. La obra toma como eje la historia clínica, para guiar al lector en el proceso de atención en salud visual, resaltando sus conceptos fundamentales. Fil: Faccia, Paula Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Ciencias Biológicas; Argentina

Published
2020

9. Agudeza visual y fijación

Author

Faccia, Paula Andrea, Toledo, Florencia Emilia, Faccia, Paula Andrea, and Liberatore, Luis Ernesto

Subjects
purl.org/becyt/ford/3.3 [https], OPTOMETRIA, OPTICA, purl.org/becyt/ford/3 [https], PROCEDIMIENTOS CLÍNICOS
Abstract

El Manual práctico: optometría clínica es un documento orientado a dar asistencia durante el aprendizaje de la práctica clínica optométrica, con el objeto de mejorar la experiencia de formación profesional de los alumnos. La obra toma como eje la historia clínica, para guiar al lector en el proceso de atención en salud visual, resaltando sus conceptos fundamentales. Fil: Faccia, Paula Andrea. Universidad Nacional de La Plata. Facultad de Ciencias Exactas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina

Published
2020

13. Hidrogeles responsivos

Author

Faccia, Paula Andrea

Subjects
SISTEMAS pH-RESPONSIVOS, Recubrimientos y Películas, Ingeniería de los Materiales, LIBERACIÓN CONTROLADA, HIDROGELES, INGENIERÍAS Y TECNOLOGÍAS
Abstract

Fil: Faccia, Paula Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Centro de Investigación y Desarrollo en Fermentaciones Industriales (i); Argentina

Published
2013

15. Synthesis, characterization, and swelling behavior of new pH-sensitive hydrogels derived from copolymers of 2-hydroxyethyl methacrylate and 2-(diisopropylamino)ethylmethacrylate.

Author

Faccia, Paula A. and Amalvy, Javier I.

Subjects
HYDROGEN-ion concentration, HYDROGELS, COPOLYMERS, METHACRYLATES, ORGANIC synthesis, CONTROLLED release drugs, OPHTHALMOLOGY, CROSSLINKING (Polymerization)
Abstract

The aim of this work was to synthesize and to characterize new pH-sensitive hydrogels that can be used in the controlled release of drugs, useful for dermal treatments or ophthalmology's therapies. Copolymers containing 2-hydroxyethyl methacrylate (HEMA) with different amounts of 2-(diisopropylamino)ethyl methacrylate (DPA) (10 and 30 wt %) and different amounts of crosslinker agent, ethylene glycol dimethacrylate (EGDMA) (1 and 3 wt %) were prepared by bulk photo-polymerization. The copolymers were fully characterized by using Fourier-transform infrared (FTIR) spectra, differential scanning calorimetry, thermogravimetric analysis, UV-visible spectroscopy, and measuring water content and dynamic swelling degree. The results show that modifications in the amount of DPA and/or crosslinker in the hydrogel produce variations in the thermal properties. When adding of DPA, we observed an increase in the thermal stability and decomposition temperature, as well as a change in the mechanism of decomposition. Also a decrease in the glass transition temperature was observed with regard to the value for pure pHEMA, by the addition of DPA. The water content of the hydrogels depends on the DPA content and it is inversely proportional to both the pH value and the crosslinking degree. Pure poly-HEMA films did not show important changes over the pH range studied in this work. The dynamic swelling curves show the overshooting effect associated with the incorporation of DPA, the pH of the solution, and the crosslinking density. On the other hand, no important variations in the optical properties were observed. The synthesized hydrogels are useful as a drug delivery pH-sensitive matrix. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 [ABSTRACT FROM AUTHOR]

Published
2013
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