University of Santiago de Compostela

Santiago de Compostela, A Coruña, Spain

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    ABSTRACT: A new analytical procedure involving the use of water and a low percentage of ethanol combined to high temperature liquid chromatography–tandem mass spectrometry has been developed for the determination of nine high-intensity sweeteners in a variety of drink samples. The method permitted the analysis in 23 min (including column reequilibration) and consuming only 0.85 mL of a green organic solvent (ethanol). This methodology provided limits of detection (after 50-fold dilution) in the 0.05–10 mg/L range, with recoveries (obtained from five different types of beverages) being in the 86–110% range and relative standard deviation values lower than 12%. Finally, the method was applied to 25 different samples purchased in Spain, where acesulfame and sucralose were the most frequently detected analytes (>50% of the samples) and cyclamate was found over the legislation limit set by the European Union in a sample and at the regulation boundary in three others.
    Food Chemistry 02/2015; 169:162–168.
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    ABSTRACT: A new method for fabricating microchannels for microfluidic applications on soda-lime glass has been developed. It consists of a combination of a laser direct write technique for fabricating the microchannels and a thermal treatment for reshaping and/or improving the morphological qualities of the generated microchannels. The proposed technique allows us to obtain microchannels with a minimum diameter of 8 µm and 1.5 µm of depth. A decrease of two orders of magnitude of the average roughness generated after the laser ablation, reaching values of the order of the unprocessed glass, has been obtained thanks to the thermal treatment. The use of pulsed nanosecond lasers for the laser direct write presents the benefits of using lasers commonly implemented in the industry for laser processing of materials. This fact makes the technique presented highly competitive compared with others used for glass microstructuring.
    Optics and Lasers in Engineering 12/2014; 63:11–18.
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    ABSTRACT: New-born calves depend upon colostrum intake for the acquisition of immunoglobulins (Ig) and other beneficial substances. However, colostrum is also a source of reactive oxygen species (ROS). Intrinsic production of ROS also increases after birth, so the combination of colostral and intrinsic ROS could overwhelm the antioxidant capacity of the calf leading to oxidative stress (OS), a condition that has been shown to play a key role in the initiation and development of several pathological conditions. The aim of this observational study was to assess the effects of the redox balance of colostrum on the oxidative status of calves and on passive immune transfer. Serum samples were taken from 20 calves on their day of birth, every week during their first month of life and at 2 and 3 months of age, and the concentrations of ROS and serum antioxidant capacity (SAC) assayed. The oxidative/anti-oxidative profile and IgG content of the colostrum were also assessed. The redox balance of the colostrum had a significant effect on both calf oxidative status and on passive immune transfer (as measured by calf serum IgG concentration), which indicates that the oxidative/antioxidative profile of colostrum should be measured when colostrum quality is assessed. The highest risk of OS during the study period was found to be when the calves were fed artificial milk replacer; this suggests that calves should be supplemented with antioxidants during this period in order to minimize any harmful consequences of high ROS generation.
    The Veterinary Journal 12/2014;

Information

  • Address
    Colexio de San Xerome, Praza do Obradoiro, s/n., 15782, Santiago de Compostela, A Coruña, Spain
  • Head of Institution
    Juan Viaño Rey
  • Website
    www.usc.es
  • Phone
    0034881 811 001
  • Fax
    0034881 811 201
Information provided on this web page is aggregated encyclopedic and bibliographical information relating to the named institution. Information provided is not approved by the institution itself. The institution’s logo (and/or other graphical identification, such as a coat of arms) is used only to identify the institution in a nominal way. Under certain jurisdictions it may be property of the institution.

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Top publications last week by downloads

 
SSRN Electronic Journal 01/2007; 4(4).
131 Downloads
 
Boletín económico de ICE, Información Comercial Española, ISSN 0214-8307, Nº 2917, 2007, pags. 59-80.
88 Downloads

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