Con la celebracion de una cata de agua mineral comenzó esta mañana en el centro de interpretación de As Burgas una serie de actividades organizadas desde el Concello de Ourense para conmemorar el Dia del Agua. La cata, que contó con la presencia de 16 participantes, estuvo dirigida por las profesoras Elena Falqué y Mª Concepción Pérez Lamela, de la Facultad de Ciencias del campus de Ourense. Las actividades continúan a las 20.30 horas en el mismo centro de interpretación con el monólogo teatralizado «Calpurnia Abana», a cargo de la Escola Municipal de Teatro, con entrada libre y gratuita. Además, el Concello mantedrá abierto el centro hasta medianoche.
Grupo de Investigaciones Agroambientales y Alimentarias
Saturday, 22 March 2014
Saturday, 1 March 2014
Development of an improved extraction and HPLC method for the measurement of ascorbic acid in cows' milk from processing plants and retail outlets
International Journal of Food Science & Technology
Volume 49, Issue 3, pages 679–688, March 2014
An improved extraction (2.5% HPO3, 5 mm dithiothreitol) and HPLC quantification methodology using a C–18 column at 35 °C and 0.1 m acetic acid (98%) and acetonitrile (2%) mobile phase was developed to quantify total ascorbic acid (AA) in commercial whole/semi-skim/skim raw/pasteurised/UHT milk packaged in opaque bags, transparent plastic, cardboard and Tetra Brik™. AA content ranged from 0.21 to 10 and from 3.4 to 16 mg L−1 in milk from retail outlets and processing plants, respectively, and was higher in organic milk. For same processor/lot samples, pasteurised milk showed higher AA content than UHT milk. This was not true for retail outlets samples. AA content was similar for whole/semi-skim and semi-skim/skim milk, but not for whole/skim comparisons. Among UHT samples, the AA content trend was whole<semi-skim<skim and lower for UHT milk in opaque plastic and Tetra Brik™ container. After 14 days at 4 °C in the dark, AA losses ranged 35–83% depending on milk type and preservation method with a higher AA retention in unopened containers.
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