EFECTO DEL ÁCIDO CÍTRICO COMO PRETRATAMIENTO SOBRE LA ACTIVIDAD DE AGUA Y COMPORTAMIENTO DE SORCIÓN EN CALLO DE ALMEJA SECO (Nodipecten subnodosus)

En presente estudio se aplicó un tratamiento de inmersión en ácido cítrico a callo de almeja, con el objetivo de reducir el tiempo de secado de la almeja mano de león. Las muestras se sometieron a inmersión en ácido cítrico 0.1 M, durante cero (control), una y tres h. Se evaluó el efecto del pre-tratamiento de inmersión en solución ácida y la temperatura de secado (50, 60 y 70 °C), sobre la aw y el fenómeno de sorción en el callo seco. Ambas variables mostraron un efecto significativo (

Metabolomics as a Powerful Tool for Molecular Quality Assessment of the Fish Sparus aurata

The molecular profiles of perchloric acid solutions extracted from the flesh of Sparus aurata fish specimens, produced according to different aquaculture systems, have been investigated. The 1H-NMR spectra of aqueous extracts are indicative of differences in the metabolite content of fish reared under different conditions that are already distinguishable at their capture, and substantially maintain the same differences in their molecular profiles after sixteen days of storage under ice. The fish metabolic profiles are studied by top-down chemometric analysis. The results of this exploratory investigation show that the fish metabolome accurately reflects the rearing conditions. The level of many metabolites co-vary with the rearing conditions and a few metabolites are quantified including glycogen (stress indicator), histidine, alanine and glycine which all display significant changes dependent on the aquaculture system and on the storage times

Quality parameters of spiny lobster (Panulirus interruptus) tails as affected by short-term emersion at two different air temperatures

The spiny lobster, Panulirus interruptus, is a valuable crustacean and most of its production is marketed live. In the northern fisheries of Baja California, Mexico, the animals are exposed to short-term emersion at different air temperatures during the live marketing procedures. This work evaluates the effect of short-term emersion (up to 10 h) at two air temperatures (7ºC and 20ºC) and of a 2-h recovery period on ATP, its related metabolites and some muscle quality parameters. Survival was 100% after all emersion times. No significant differences were found either in the adenylic energetic charge or in the levels of ATP and its related metabolites. The highest concentrations were found for AMP, IMP and INO, while ATP had the lowest levels. Muscle quality parameters such as water holding capacity and shear force remained similar to the control values. Although pH decreased slightly with emersion, it was very close to the control values after the 2-h recovery period. The overall results suggest that P. interruptus may perform physiological compensatory work after 10 h emersion even at 20ºC without significantly affecting the muscle quality