Summary Cassava starch and poly(butylene adipate‐co‐terephthalate) (PBAT) based films containing microencapsulated oregano essential oil (OEO) and free OEO are produced by blow extrusion. Microcapsules produced by ionic gelation were characterized with respect to average size, morphology, and encapsulation efficiency. The microcapsules were spherical and ranged in size from 20 to 1000 μm. Encapsulation efficiency (EE) is 83%. The films are analyzed in terms of their morphology, mechanical properties, water vapor permeability (WVP) and antibacterial properties. The films containing OEO microcapsules exhibited lower ultimate tensile strength, Young's modulus and elongation at break than the control films and the films containing free OEO. The WVP of films containing free OEO is slightly lower, while that of films containing microencapsulated OEO did not differ significantly from the control films. Scanning electron microscopy (SEM) images showed that the surface of films containing microencapsulated OEO are less homogeneous than those of the control and free OEO films. Films containing free or microencapsulated OEO presented inhibitory activity against Staphylococcus aureus, but not against Escherichia coli.
This study aimed to produce wheat flour and poly (butylene co-terephthalate adipate) films with the addition of free and microencapsulated oregano essential oil by blown extrusion and to evaluate its applicability as an active packaging in the preservation of the Brazilian fresh pastry, known as Pastel. The oregano essential oil microparticles were produced by spray drying and characterized in terms of morphology, encapsulation efficiency, and mean diameter. In the films, the physical, antioxidant, and diffusion kinetics of oregano essential oil were determined. Films with microencapsulated oregano essential oil showed lower tensile strength and Young's modulus and higher elongation, solubility, antioxidant capacity, and diffusion coefficient when compared to the control and free oregano oil films. During 28 days of refrigerated storage, fresh pastry packaged with film with oregano essential oil microparticles presented a lower count of molds and yeasts, compared to pastries packed with control and free oregano oil films. The microencapsulation protected oregano essential oil from extrusion condition shearing and temperature damages during film production, allowing the development of biodegradable active films for application in foods where contamination by molds and yeasts is predominant.
A vida útil de um óleo vegetal depende de algumas variáveis que envolvem desde o cultivo, extração, transporte e, principalmente, o armazenamento dos grãos. Os processos de oxidação são responsáveis pela redução da vida útil das matérias-primas lipídicas. Dentre os processos de oxidação, a rancidez é a principal alteração que ocorre, resultando em modificações consideráveis na qualidade final e sensorial dos óleos vegetais e determinando, de uma forma direta, a vida útil do mesmo. A auto oxidação, a polimerização térmica ou a oxidação térmica também são alterações químicas que ocorrem nos óleos vegetais, sendo essas reações aceleradas pelo mal armazenamento e também pelo calor. O óleo de café torrado é um produto de altíssimo valor agregado, uma vez que seu valor de mercado é muito maior que a matéria-prima principal, o café. Assim sendo, o objetivo deste estudo foi qualificar e quantificar os ácidos graxos presentes por meio de cromatografia gasosa, qualificar os compostos aromáticos e quantificar e monitorar o teor de cafeína presente no óleo durante 12 meses em diferentes temperaturas de armazenamento. Na análise dos compostos aromáticos foi possível identificar vários compostos responsáveis pelo aroma de café e não foi identificado o composto malonaldeído, responsável pelo aroma de ranço em óleos durante o armazenamento. Os principais ácidos graxos presentes no óleo de café são o Linoléico, Palmítico, Esteárico e o Oléico. O óleo apresentou uma quantidade de cafeína, que se manteve constante ao longo de 12 meses e em ambas temperaturas de armazenamento.
Processo simultâneo de sacarificação e fermentação alcoólica de polpa de tamarindo (Tamarindus indica L.) para posterior acetificação Simultaneous saccharification and alcoholic fermentation of tamarind (Tamarindus indica L.) pulp for further acetification
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