Estudo dos efeitos da radiação gama sobre a qualidade microbiologica, a oxidação lipidica e as propriedades sensoriais da carne mecanicamente separada de frango, armazenada refrigerada e congelada

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

Mechanically deboned chicken meat (MDCM) is widely used in traditional meat products such as sausages. The process of mechanical separation results in grinding of the bones, liberating the marrow and rupturing cells, thus making the MDCM a favorable medium for biochemical reactions and microbiological growth. lrradiation using a Co6o source is one of the processes which has been developed aimed at reducing contamination by spoilage and pathogenic microorganisms in foods. The main advantages of food irradiation are the possibilities of treating the already packaged products at refrigerated and frozen temperatures, ideal for a highly perishable product such as MDCM, which, being a ground, easily spoiled product, requires rapid cooling followed by freezing, immediately after processing. Processing with ionizing radiation results in chemical alterations in the food, including the production of volatile compounds and free radicaIs. lrradiation of meat in the frozen state reduces or eliminates the negative sensory effects of this process. ln this context, this study aimed at evaluating the effects of gamma radiation at doses of 3.0 and 4.0 kGy, on the microbiological quality, lipid oxidation and sensory properties of MDCM, at the refrigerated (2 :t 1°C) and frozen (-18 :t 1°C) storage. The results showed that irradiation increased the shelf life of this raw material when stored under refrigeration, as compared to non-irradiated samples. Since doses of 3.0 kGy produced increases in the shelf life of refrigerated MDCM equal or greater than those produced by doses of 4.0 kGy, this dose was considered the most adequate for the irradiation of this raw material. According to the results of microbiological, chemical and sensorial testing in irradiated MDCM samples with doses of 3.0 kGy and 4.0 kGy, the material studied presented conditions that were adequate for human consumption during the 90 days of frozen storage, whereas samples ofnon-irradiated MDCM were shown to be unacceptable with respect to the occurrence of S. aureus and fecal coliforms afier only 30 days of frozen storage. The irradiation process produced characteristic volatile compounds, perceived as irradiation odor. These were lost from the MDCM during refrigerated and frozen storage. For the non-irradiated MDCM samples, bacterial contamination was the main limiting factor with respect to the shelf life, whereas for the irradiated MDCM samples this factor was lipid oxidation

ASSUNTO(S)

alimentos - microbiologia carne de ave lipidios - oxidação avaliação sensorial

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