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León, Mexico

Santiago-Adame R.,Durango Institute of Technology | Medina-Torres L.,National Autonomous University of Mexico | Gallegos-Infante J.A.,Durango Institute of Technology | Calderas F.,CIATEC | And 4 more authors.
LWT - Food Science and Technology | Year: 2015

The effect of temperature and feed rate on spray dried cinnamon infusions (SDCInf) using maltodextrin as an encapsulating agent was studied (inlet temperature: 140, 160, and 180 °C; feed rate: 8 and 10 mL/ min). Total phenolic content (TPC), antioxidant capacity (DPPH*), morphology (SEM), chemical (FTIR) and rheological properties, and releasing profiles were assessed in SDCInf. Cinnamon infusions (CInf) resulted in 29.32 (±0.70) mg of GAE/g of cinnamon. As for DPPH* inhibition, EC50 was 0.291 (±0.09) mg of cinnamon/ mL. Microparticles showed a deflated-balloon like shape, encapsulating up to ~85% of the cinnamon infusion, and a simple shear-thinning behavior (n < 1). Results show that powdered SDCInf obtained at 160 and 180 °C and 10 mL/min yielded the best protection for cinnamon infusions. © 2015 Elsevier Ltd.

Medina-Torres L.,National Autonomous University of Mexico | GarcIa-Cruz E.E.,National Polytechnic Institute of Mexico | Calderas F.,National Autonomous University of Mexico | Gonzalez Laredo R.F.,Durango Institute of Technology | And 4 more authors.
LWT - Food Science and Technology | Year: 2013

The spray-drying process has been previously used to encapsulate food ingredients such as antioxidants. Thus the objective of this work was to produce microcapsules of gallic acid, a phenolic compound that acts as antioxidant, by spray drying with an aqueous extract of nopal mucilage (Ofi), which acted as an encapsulating agent. The rheological response and the particle size distribution of the final solutions containing gallic acid at concentrations of 6 g/100 mL were characterized along with the control sample, no gallic acid added, to elucidate the degree of encapsulation. The drying parameters to prepare the microcapsules with extract of nopal mucilage were: inlet air temperature (130 and 170 °C) and speed atomization (14,000 and 20,000 rpm). The rehydrated biopolymer showed a non-Newtonian pseudoplastic behavior. The Cross Model was used to model the rheological data. Values for ". m" varied between 0.55 and 0.85, and for " time characteristic,. λ", the range was between 0.0071 and 0.021 s. The mechanical spectra showed that the sample with gallic acid was stable long term (>2 days) and presented a bimodal particle size distribution. This study demonstrated the effectiveness of nopal mucilage when utilized as wall biomaterial in microencapsulation of gallic acid by the spray-drying process. © 2012 Elsevier Ltd.

Sanchez-Olivares G.,CIATEC | Sanchez-Solis A.,National Autonomous University of Mexico | Calderas F.,National Autonomous University of Mexico | Medina-Torres L.,National Autonomous University of Mexico | And 3 more authors.
Applied Clay Science | Year: 2014

In the present work, the effect of sodium montmorillonite (Na+Mt) on the resulting properties of semi-finished (crust) leather has been thoroughly studied. Na+Mt has been added during retanning process of tanned (wet-blue) leather in specific conditions. The morphological analysis by scanning electron microscopy has pointed out that Na+Mt particles are homogeneously distributed and finely dispersed within the leather structure. The presence of clay mineral has affected the thermal stability of leather in nitrogen and air (assessed by thermogravimetry), as well. According to the sixty second vertical flammability test results Na+Mt particles have significantly reduced the burning length of the semi-finished leather. A barrier mechanism of the Na+Mt during combustion process is proposed. Mechanical properties (namely, tensile and tear strength) have proven to be considerably improved by using 1 and 3 mass% of Na+Mt; these results have clearly indicated the reinforcing effect of clay mineral platelets that somehow physically interact with leather. © 2014 Elsevier B.V.

Cruz O.,CIATEC | Santos R.,Technical University Zacatecas
IIE Annual Conference and Expo 2013 | Year: 2013

This article presents a choice to improve the process of assigning storage allocations in a warehouse. The main inconvenient frequently in these situations are, that existing techniques like model assignment or plant layout representations require the compliance of some assumptions that commonly do not appear in reality. Sometimes it is necessary to deal with complex and diverse variables that make the use of traditional tools difficult. Therefore, considering the complexity of the problem, this document is presented as an alternative to improve the mentioned process. The document is based on simulation using FLEXSIM® and artificial neural networks, considering the problem linearly separable.

Rendon-Ramirez A.-L.,Research Center y Estudios Avanzados | Maldonado-Vega M.,CIATEC | Quintanar-Escorza M.-A.,University of Sfax | Hernandez G.,Research Center y Estudios Avanzados | And 3 more authors.
Environmental Toxicology and Pharmacology | Year: 2014

The molecular response of the antioxidant system and the effects of antioxidant supplementation against oxidative insult in lead-exposed workers has not been sufficiently studied. In this work, antioxidants (vitamin E 400. IU. +. vitamin. C 1. g/daily) were supplemented for one year to 15 workers exposed to lead (73. μg of lead/dl of blood) and the results were compared with those on 19 non-lead exposed workers (6.7. μg of lead/dl). Lead intoxication was accompanied by a high oxidative damage and an increment in the erythrocyte antioxidant response due to increased activity of catalase and superoxide dismutase. Antioxidant supplementations decreased significantly the oxidative damage as well as the total antioxidant capacity induced by lead intoxication with reduction of the antioxidant enzyme activities. We conclude that antioxidant supplementation is effective in reducing oxidative damage and induces modifications in the physiopathological status of the antioxidant response in lead-exposed workers. © 2013 Elsevier B.V.

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