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Diaz-Bandera D.,National Autonomous University of Mexico | Villanueva-Carvajal A.,National Autonomous University of Mexico | Dublan-Garcia O.,National Autonomous University of Mexico | Quintero-Salazar B.,University of Tourism of Costa Rica | Dominguez-Lopez A.,National Autonomous University of Mexico
International Journal of Food Science and Technology | Year: 2013

Summary: Gelatin beads containing a concentrated extract of Roselle (Hibiscus sabdariffa L.) calyx rich in polyphenolic compounds were coated with sodium alginate and ionotropically gelled using CaCl2. Single-coated beads and double-coated beads were obtained by this technique, and the release pattern of the loaded extract was evaluated. As a result, release pattern of these compounds fits properly to a first-order Weibull distribution equation. The release rate constant decreased linearly with the number of alginate coats and with the increase in immersion time in CaCl2 and the Lag period increased significantly with the number of alginate coats. The release of H. sabdariffa's polyphenols can be well controlled manipulating the number of alginate coats and the immersion time in a CaCl2 solution, allowing not only to control the gastrointestinal segment where they could be released but also to control the release rate with the certainty that the initial concentration will be completely released showing a highly significant antioxidant activity as well. © 2013 The Authors. International Journal of Food Science and Technology © 2013 Institute of Food Science and Technology. Source


Diaz-Bandera D.,National Autonomous University of Mexico | Villanueva-Carvajal A.,National Autonomous University of Mexico | Dublan-Garcia O.,National Autonomous University of Mexico | Quintero-Salazar B.,University of Tourism of Costa Rica | Dominguez-Lopez A.,National Autonomous University of Mexico
LWT - Food Science and Technology | Year: 2015

The aim of this study was to investigate the effect of different carriers (maltodextrin, pectin, gelatin, carboxymethyl cellulose, whey protein, carrageenan and gum arabic) on the release kinetics and dissolution of Roselle's extract obtained through a spray drying process. Aqueous solutions at different concentrations of carrier and extract were prepared. The particles obtained exhibited nearly monomodal or bimodal size distribution, indicating two predominant sizes. The frequency distribution of the mean size of the powders behaved, significantly, like a normal distribution. Throughout the dissolution test, all the particles obtained followed a Weibull-First Order kinetic model. Pectin retained the highest amount of polyphenols after the drying process (98.20 mg GAE/100 mg GAE of roselle concentrate) and released the highest amount of phenolic compounds (79.48 mg GAE/100 mg GAE in the particles) during a longer time. Pectin particles obtained (9 mm as mean size) were significantly homogeneous (93.45 g/100 g powder), being the most suitable carrier of Roselle's phenolic compounds compared to the other carriers used. Estimated dissolution times, by means of the dissolution equation proposed, were compared to experimental results and proved to be more reliable than the regularly used observation method. © 2015 Elsevier Ltd. Source


Bohn V.Y.,University of Tourism of Costa Rica | Piccolo M.C.,CONICET | Perillo G.M.E.,CONICET
Estudios Geograficos | Year: 2013

The aim of this study was to evaluate the correlation between field sensors and sate - llite images in the bio-optical characterization of Lake Chasicó (Argentina) during the February-April 2010 period. The morphometric parameters of the body of water were obtained from in situ measurements and satellite data processing. The sensors that were used allowed spectral signatures to be acquired and then surface water characteristics were detected: turbidity, chlorophyll-a and depth variations. Results obtained from the morphometric analysis included that the lake surpassed the 50 km2 extension and showed a sub-rectangular elongated shape. The chlorophyll-a spatial distri - bution in the lake was modeled from the satellite image processing, in situ chlorophyll-a data and the Normalized Difference Vegetation Index (NDVI) calculation. 53.2 % of its area showed a chlorophyll-a range between 5 and 10 g/l. Therefore, the body of water was characterized as a mesotrophic lake, during the studied period. Source


Hruleva M.,University of Tourism of Costa Rica | Romero A.B.,Autonomous University of Barcelona | Valiente G.C.,Autonomous University of Barcelona
Cuadernos de Turismo | Year: 2013

This article analyzes the possibilities for development of pilgrimage travel and religious tourism in the monasteries of The Holy Mount of Sofia (Bulgaria). The pilgrimage is described as a specific tourist product and we explained the importance of the strategic planning as a tool to diversify the offer of any tourist destination. In the study, it is also described the religious environment of The Holy Mount and its main characteristics as a pilgrimage center. We analyze the strategy, the market and the tourist offer in Bulgaria of the city of Sofia, mainly based on the cultural and business segment. Finally, statistical data are measured to evaluate the potential of Holy Mount of Sofia as a tourist destination, to design proposals and to face some challenges ahead. Source


University of Tourism of Costa Rica | Entity website

El acelerado desarrollo turstico de Costa Rica, dio base a la iniciativa de fundar una institucin especializada en la formacin de talento humano, altamente calificado, para atender las demandas de la industria de la hospitalidad y el turismo ecolgico. Mediante un estudio de necesidades de profesionales en la industria turstica costarricense y un proceso de seleccin de cuerpo docente, se cumpli con los trmites necesarios para su debida inscripcin y reconocimiento ...

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