Characterization of orange oil microcapsules for application in textiles

[EN] The use of orange oil presents as an ecological alternative to chemicals, attracting the attention of the scientific community to the development of eco-friendly antimicrobials. The microencapsulation technology has been used for the application of orange oil to textiles, being an economically viable, fast and efficient method by combining core and shell materials, desirable perceptual and functional characteristics, responsible for properties related to the nature of the product and provides that the wall materials release the functional substances in a controlled manner, in addition to effectively protecting and isolating the core material from the external environment to prevent its volatilization and deterioration, increasing the stability of the oil, such as non-toxicity. Thus, to better exploit the properties of the orange essential oil applied to textile products this study presents a characterization of microcapsules of Melamine formaldehyde obtained by the interfacial polymerization method with variations of proportions of orange oil (volatile) with fixed oil Medium-Chain Triglycerides (MCT) (non-volatile) to assist in the stability of the orange essential oil. Scanning electron microscope (SEM) was used as visualizing tool to characterize microparticles and surface morphology and thermal characteristics of microcapsules were premeditated by mean Differential scanning calorimetry (DSC).Soares-Rossi, W.; Bonet-Aracil, M.; Bou-Belda, E.; Gisbert Paya, J.; Wilson, K.; Roldo, L. (2017). Characterization of orange oil microcapsules for application in textiles. IOP Conference Series Materials Science and Engineering. 254:1-7. doi:10.1088/1757-899X/254/2/0220071725

Sertolioma unilateral como causa de morte súbita por hemorragia interna em ganso Anser cygnoides

Um ganso adulto macho (Anser cygnoides), da família Anseriformes, de idade desconhecida, proveniente de uma criação da Universidade Luterana do Brasil, foi encontrado morto, sem apresentar histórico clínico, e foi submetido à investigação post mortem no Setor de Patologia Veterinária do Hospital Veterinário. Com base nos achados de necropsia e no exame histopatológico, definiu-se como causa da morte do animal hemorragia interna em razão da ruptura de vasos sanguíneos em uma neoplasia no testículo direito (sertolioma), com metástase no fígado

Microscopio electrónico de transmisión para el control de síntesis de microcápsulas de aceite esencial de naranja con adición de trigliceridos de cadena media

[ES] La microencapsulación en la industria textil puede añadir propiedades específicas a través del revestimiento de textiles con diversas sustancias activas protegiéndolos de condiciones externas desfavorables y controlando su liberación. Este estudio presenta la caracterización de microcápsulas poliméricas de melamina-formaldehído obtenidas por el método de polimerización interfacial in situ con una proporción de aceite esencial de naranja (volátil) y la adición de triglicéridos de cadena media (no volátil) en dos ratios (1:1) y (1:2). El objetivo de dicha adición es estabilizar el aceite esencial de naranja y facilitar su encapsulación. La morfología y para tener una idea de la estabilidad de las microcápsulas sintetizadas se analizaron utilizando el microscopio electrónico tanto de barrido (SEM) como de transmisión (TEM). Al final, se puede percibir la importancia de la análisis por TEM para caracterizar la morfología de las microcápsulas y seleccionar las que poseen mejores características tanto de morfología y en relación a la presencia de material activo para optimizar el proceso de síntesis por medio de ajustes en la formulación.[EN] Microencapsulation in the textile industry can add specific properties through the coating of textiles with various active substances protecting them from unfavorable external conditions and controlling their release. This study presents the characterization of melamine-formaldehyde polymeric microcapsules obtained by the in situ interfacial polymerization method with a proportion of orange essential oil (volatile) and the addition of a fixed oil Medium Chain Triglyceride oil (non-volatile) in two proportions (1:1) and (1: 2), to help stabilize the orange essential oil. The morphology and stability of the synthesized microcapsules were analyzed using the transmission electron microscope. In the end, the importance of the TEM analysis can be perceived to characterize the morphology of the microcapsules and select those that have better morphology characteristics and in relation to the presence of active material to optimize the synthesis process by means of adjustments in the formulation.Apoyo de las Agencias Brasileñas Conselho Nacional de Desenvolvimento Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Capes) y el proyecto Euro-Brazilian Windows+ (con el apoyo financiero concedido por la Comisión Europea a través del programa Erasmus Mundus).Soares-Rossi, W.; Bonet-Aracil, M.; Bou-Belda, E.; Roldo, L.; Kindlein, W. (2018). Microscopio electrónico de transmisión para el control de síntesis de microcápsulas de aceite esencial de naranja con adición de trigliceridos de cadena media. Revista de Química e Industria Textil. (224):26-30. http://hdl.handle.net/10251/112954S263022

ENGINEERING DESIGN: EICOSANE MICROCAPSULES SYNTHESIS AND APPLICATION IN POLYURETHANE FOAMS AIMING TO DIMINISH WHEELCHAIR CUSHION EFFECT ON SKIN TEMPERATURE

Thermal comfort of wheelchairs still requires improvements, since users remain on the chair for as long as 12 h a day. Increased sweating makes the skin more susceptible to colonization by fungi and bacteria, and may cause pressure ulcers. In this sense, the microencapsulation of Phase-Change Materials (PCMs) may help to enhance wheelchair cushion comfort by regulating heat exchange. This study describes the production of PCM microcapsules and their application in flexible polyurethane foams after expansion, and assesses improvements in heat exchange. Microcapsules with eicosane core coated with melamine-formaldehyde were produced. Eicosane is a thermoregulation agent whose phase-change temperature is near that of the human body’s. Microcapsules were characterized by thermogravimetric analysis, differential scanning calorimetry, scanning electron microscopy, and Fourier transform infrared spectroscopy. Then, microcapsules were applied on polyurethane foams by vacuum filtration and high-pressure air gun. Samples were exposed to a heat source and analysed by infrared thermography. The results indicate that thermal load increased in samples treated with microcapsules, especially by pressure air gun, and show that it is possible to enhance thermal comfort in wheelchair seats. Thereby, this study contributes to enhance quality of life for wheelchair users, focusing on thermal comfort provided by cushion seats made from PU foam

Intestinal morphology and histology of the striped catfish Pseudoplatystoma fasciatum (Linnaeus, 1766) fed dry diets

This study unveils histological features of the intestinal tract of juvenile striped catfish Pseudoplatystoma fasciatum (Linnaeus, 1776) in three size classes (weight, standard length): I - 36.84 +/- 10.19 g, 14.52 +/- 1.54 cm; II - 59.03 +/- 11.47 g, 17.17 +/- 1.06 cm; III - 89.72 +/- 18.70 g, 20.79 +/- 1.55 cm, respectively. Histological organization of the juvenile speckled catfish intestine bears features common to the carnivorous fish, but the organ presents some convolutions that indicate a certain degree of dietary flexibility, a surprising trend, common only to omnivorous Siluriforms. The architecture of the mucosa of the speckled catfish intestine indicates that the species concentrates digestion and absorption of nutrients in the medium intestine, a common feature among carnivorous Teleosts.Fundacao de Amparo Pesquisa do Estado de Sao Paulo - FAPESP`[04/09721-3]`Conselho Nacional de Desenvolvimento Cientifico e Tecnologico - CNPq