IBIMOL   23987
INSTITUTO DE BIOQUIMICA Y MEDICINA MOLECULAR PROFESOR ALBERTO BOVERIS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Seasonality Oxidative Condition in the Commercial Mussel Mytilus edulis platensis.
Autor/es:
GONZALEZ P.M.; CAMPANA G; MALANGA G.; QUARTINO L; PUNTARULO S.; ZACKER K
Lugar:
Buenos Aires
Reunión:
Congreso; XXI Congreso Latinoamericano y del Caribe de Ciencia y Tecnología de Alimentos-XVII Congreso Argentino de Ciencia y Tecnología de Alimentos; 2019
Institución organizadora:
Universidad Católica Argentina
Resumen:
Commercial fishing activities in San Matias Gulf, Argentinean Sea,began in the 70?s been the first collected speciesbivalves (mussels such asMytilus edulis platensisand scallops) and fishes.M. edulis platensis is one of the most important sources of aquaculture in the region.The palatability of the mollusc, an important factor that substantially affects its consumption,could be strongly influenced by lipid peroxidation of the membranes due to the high content of polyunsaturated fatty acids sensitive to deleterious changes. These alterations could be promoted by the environmental challengesin the area that may causedifferent degree of stress. The hypothesis presented here is that seasonalitymay affect both, the oxidation and the antioxidant capacity in the mollusc. Digestive glands were isolated from specimens collected in the San Matías Gulf during summerand winter. Lipid radical content,assessed by paramagnetic electronic resonance (EPR),was 2-fold higher in the samples from animalscollected in winter as compared to values obtained insamples collected during summer. The contentof the lipid soluble antioxidant α-tocopherol(measured by HPLC) was 55% higher and catalase activity increased by 3.8-fold in winter animals compared to summer values.The lipid radical/α-tocopherol content ratio, an indicator of oxidative balance in the hydrophobic cellular environment, showed no significant differences between samples collected in winter and summer. Nitric oxide (NO) generation by the tissues could also affect the oxidation of membranes. Nitrite plus nitrate content was not significantly different among samples collected in the tested seasons, but NO content was 8.5-folderhigher in samples from winter than values obtained in summer. These results showed that even though climatic changes did not modify the balance in the hydrophobic cellular medium, oxidative and nitrosative metabolisms were significantly affected.The antioxidant protection increases would be responsible of preventing the lipid damage. However,deterioration of lipids in winter, as compared to summer collected samples,showed that palatability could be affected since organolepticcharacteristics could be modified decreasingcommercialization interests. These studies would contribute to selectthe optimal time for catching of the animals to be used by the food industry. Moreover, exploitation progress of this important resource, will require the use of commercialization and conservation strategies that would allow the preservation of the integrity of the material by long periods.