CIDCA   05380
CENTRO DE INVESTIGACION Y DESARROLLO EN CRIOTECNOLOGIA DE ALIMENTOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Chemical characterization of edible muscle tissue of Brazilian menahem (Brevoortia aurea) along its spawning cycle
Autor/es:
C. PENNISI FORELL; E. MANCA; A CALIFANO
Lugar:
New Orleans
Reunión:
Congreso; 2011 IFT Annual Meeting; 2011
Institución organizadora:
Institute of Food Technologist
Resumen:
Long-chain polyunsaturated fatty acids (PUFA) are critical nutrients for human health. The use of sub exploited species such as Brazilian menhaden (Brevoortia aurea) is an alternative to develop new healthy products with high PUFA content. It is a sub-exploited pelagic specie, discarded in great volumes along Argentinean coastline shores. Chemical composition and fatty acid profile of the muscle of Brazilian menhaden of different maturities maturity stages were determined to use this species as an alternative raw material for the development of products. In particular the effect of spawning was examined. Fish were caught between July 2008 and May 2009. In July (spent stage) individuals presented the highest muscle lipid content (20.6±7.0%). In September muscle lipid content decreased, reaching a minimum (3.2±2.7%) in December at the egg-laying stage. This decrease of muscle lipid content is associated with lipid migration from the muscle to the gonads for their development previous to ripening. Lipids in flesh muscle were replaced by water but protein content remained constant (approximately 18%). The FA profile showed that the overall composition remained practically constant. Saturated FA represented 35-36% of total lipids: unsaturated FA 61.5-63%, MUFA 36-38%, and PUFA 23-31%. The n-6/n-3 ratio was 0.16 and 0.09 (July-December,respectively). Brevoortia aurea is a good nutritional option for human consumption, 100g of muscle represents 2.5 g of EPA+DHA in July, and 0.55g in December. The effect of frozen storage (-18ºC) on functional properties of proteins (water holding capacity, drip losses, and protein denaturation by differential scanning calorimetry,DSC) was also studied during 6 months. DSC peak temperatures and denaturation enthalpies were not affected by the reproductive stage of the samples. After 6 months total denaturation enthalpy decreased up to 60% but both peaks were still noticeable. Drip loss was smaller in July than in December, but both groups increased strongly with storage time.