Effect of water activity in tortilla and its relationship on the acrylamide content after frying

The objective of this study was to relate the tortilla minimum integral desorption entropy with acrylamide content during processing of tortilla chips. Tortilla pieces were stored at 30 °C at aw of 0.11-0.84 for 4 days and fried later in soybean oil at 180 °C for 25 s. The lowest acrylamide content was observed in tortilla chips made of non-stored tortilla (aw = 0.98) as well as in those prepared from tortilla stored in the minimum integral entropy (aw = 0.53). In addition, the color and texture values were similar in both cases. These results suggest that the reduction of the acrylamide content during processing of tortilla chips and other tortilla based foods thermally processed might be modified by factors such as moisture content, aw, and the physical state of water in the tortilla. Thus, the minimum integral entropy showed to be a reliable indicator to establish the most appropriate moisture conditions to obtain tortilla chips with reduced level of acrylamide when tortilla is dehydrated. © 2014 Elsevier Ltd. All rights reserved.We are indebted to Juan Veles, Edmundo Gutierrez, Carlos Alberto Ávila, Araceli Mauricio and Veronica Flores from CINVESTAV Querétaro for their technical assistance.Peer Reviewe

Chitosan-Gold Nanoparticle Composites for Biomedical Application

The aim of this work is to synthesize chitosan-gold nanoparticles films by direct chemical reduction of HAuCl4 in a chitosan solution and to investigate the influence of gold nanoparticles concentration on the structure of films, conductivity and healing effect on mice skin after surgery. Results obtained have shown that new chitosan-gold nanoparticle-collagen bionananocomposites demonstrated better healing effect on the mice skin after surgery than control performed on commercial TheraFormTM material. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3540

Síntesis y caracterización de un material criogénico a partir de quitosano y celulosa

Los criogeles formados a partir de los polisacáridos quitosanoy celulosa están conformados por una red macroporosa e interconectada con áreas superficiales altas. Dichos criogeles ofrecen un uso prometedor en la remoción de cobre a partir de soluciones acuosas. Este trabajo propone la ruta de síntesis del criogel quitosano-etilenglicol diglicidil éter-celulosa (Q-egde-C) y en él se presentan los resultados obtenidos de la caracterización de este material con la finalidad de evaluarlo en trabajos posteriores como adsorbente de iones Cu+2. Las pruebas y técnicas de caracterización utilizadas fueron: solubilidad, porcentaje de hidratación, microscopía electrónica de barrido(MEB), espectroscopía infrarroja por transformada de Fourier(FTIR), área específica y potencial Z. El criogel obtenido es un biomaterial insoluble en agua, con un índice de hinchamiento de ca. 1921 %; su estructura macroporosa contiene grupos amino primarios (–NH2) con un área superficial de 16 m2/g. La síntesis presentada es sencilla con un buen control morfológico en la escala micro y nanométrica, así mismo el criogel mostró mediante la determinación del potencial Z que es capaz de interaccionar con el ión Cu+2 presente en agua

Correction: Porous monoliths synthesized via polymerization of styrene and divinyl benzene in nonaqueous deep-eutectic solvent-based HIPEs (RSC Advances (2015) 5 (23255-23260) DOI: 10.1039/C5RA02374B)

© 2018 The Royal Society of Chemistry. The authors regret that there was an error in the results and discussion section of the original article. On page 23257, the text read, The surfactant employed here was sorbitan monooleate . This should have read, The surfactant employed here was sorbitan stearate . The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers

Trends in Tissue Regeneration: Bio-Nanomaterials

Tissue engineering requires functional platforms or scaffolds with specific properties concerning the morphology, chemistry of the surface and interconnectivity to promote cell adhesion and proliferation. These requisites are not only important for cellular migration but also to supply nutrients and expulsion of waste molecules. Cell type must be considered when designing a specific cellular grown system as a scaffold; for instance, if they are autologous, allogeneic or xenogeneic. The challenge in tissue engineering is to develop an organized three-dimensional architecture with functional characteristics that mimic the extracellular matrix. In this regard, with the advent of nanotechnology scaffolds are now being developed that meet most of the aforementioned requisites. In the present chapter, the use of biopolymers based nanostructures is addressed, including biomaterials and stem cells, bio-nanocomposites, and specific clinical cases where these systems were employed. We emphasize the future challenges and perspectives in the design of biocompatible and nontoxic nanocomposites with high efficiency as a promoter for tissue regeneration and many other biomedical applications

Gelatin–chitosan–PVA hydrogels and their application in agriculture

This work demonstrated the ability of a fabrication process in the preparation of gelatin-chitosan-PVA hydrogels for potential agricultural applications. The hydrogels showed a dense, tridimensional, interconnected and reticulated structure that was more evident in the hydrogel loaded with inulin. The hydrogels showed a water absorption capacity of ≤12 times its mass. FTIR and light microscopy demonstrated that the hydrogels were biodegradable. The percentage of degradation of hydrogels in inoculated soil was higher than in sterile soil using the soil burial test. Hydrogel loaded with inulin was found to be capable of inducing resistance in chili plants against Phytophthora capsici.ITESO, A.C

Atomic surface segregation and structural characterization of PdPt bimetallic nanoparticles

"Bimetallic nanoparticles are of interest since they lead to many interesting electrical, chemical, catalytic, and optical properties. They are particularly important in the field of catalysis since they show superior catalytic properties than their monometallic counterparts. The structures of bimetallic nanoparticles depend mainly on the synthesis conditions and the miscibility of the two components. In this work, PdPt alloyed-bimetallic nanoparticles (NPs) were synthesized through the polyol method, and characterized using spherical aberration (Cs) corrected scanning transmission electron microscopy (STEM). High-angle annular dark-field (HAADF)-STEM images of bimetallic nanoparticles were obtained. The contrast of images shows that nanoparticles have an alloy structure with an average size of 8.2 nm. Together with the characterization of nanoparticles, a systematic molecular dynamics simulations study focused on the structural stability and atomic surface segregation trends in 923-atom PdPt alloyed-bimetallic NPs was carried out.

Deslizamientos submarinos y tsunamis en el Mar de Alborán. Un ejemplo de modelización numérica

Los componentes principales de este libro son: a) conocer y estudiar determinados fenómenos naturales de consecuencias catastróficas, como los tsunamis, y b) identificar los útiles científicos para representar estos fenómenos. Por ello, es necesario disponer de un profundo conocimiento del fondo marino donde se produce el fenómeno, conocimiento que proviene del análisis de datos geológicos y geofísicos, y por otro lado, es encesario hacer uso de la potencialidad de los modelos matemáticos que permiten realizar simulaciones numéricas precisas. El libro presenta los resultados de la simulación numérica de un tsunami generado en la cuenca del Mar de Alborán y su propagación e interacción con la morfología submarina de dicho área geográfica.Versión del edito