Efeito da embalagem em atmosfera modificada na conservação do matrinxã (brycon amazonicus)

Abstract

The Amazon region population has a habit of acquiring preferably fish "in natura" and / or chilled than in seasons between harvests demand increases in retail outlets consisting of public markets, fairs and supermarkets. To prolong the life business is the development of fundamental techniques associated with maintenance, so the food to keep up their nutritional and organoleptic as well as its consumer security, so the use of Modified Atmosphere Packaging can be efficient to keep these parameters. The aim of this study was to evaluate the influence of modified atmosphere associated with refrigeration technique as prolong the storage matrinxã (Brycon amazonicus) maintained at 2 ± 1 ° C. The fish were processed and washed with sodium hypochlorite solution to 5 ppm, then with saturated sodium chloride solution at 5% for 10 minutes and analyzed for chemical composition, physical-chemical, microbiological and sensory evaluation for Product quality during the time of storage of modified atmosphere packaging (vacuum, CO2 and 100% CO2/N2 60/40%). The results showed higher microbial growth in control samples (untreated) and vacuum, which maintained good quality for about 21 days of storage, when they reached the limits set by law for Staphylococcus coagulase positive, however, showed considerable reduction in bacterial treatments EAM with CO2/N2-60/40% and 100% CO2-good quality that extended for approximately 35 days of storage. Mesophilic bacteria and psychrotrophs not reached the limits of 6.5 log CFU g-1 in all treatments and storage times. The pH shown not to be a good index for evaluating the quality of the product. No changes were detected in lipid oxidation treatments over time. The vacuum treatment was the only one where the TVB-N values reached 29.65 mg 100g-1 at 21 days of storage. The sensory analysis of fish, through the method of quality score did not indicate rejection limits during storage, however, the acceptability test of packaged samples CO2-100% not achieved good results, possibly due to high concentration of carbon dioxide in the samples. The modified atmosphere packaging when associated with chilling is a promising technique to extend the life of matrinxã longer, compared to the conventional methods (vacuum and air), thus supporting the transport over long distances and improving logistics produc.