Abstract
QUALITY OF MINIMALLY PROCESSED SWEET CORN KEPT UNDER DIFFERENT ATMOSPHERES The purpose of this work is to evaluate the use of three different atmospheres (2% O 2 + 8% CO 2 , 4%O 2 + 8% CO 2 and normal atmosphere) on the quality of minimally processed sweet corn during its conversation at 5°C for nine days. Ears of sweet corn were used of the hybrid of the breeding program of Embrapa Corn and Sorghum with mutant gene sh2 (Embrapa HT1). The contents of glucose, fructose, β-cryptoxanthine, firmness and L* value were influenced only by the storage time. The controlled atmospheres were efficient to reduce the mass loss of the sweet corn ears and from the results obtained for pH and titratable acidity, to maintain the respiratory activity reduced until three days of storage. Higher contents of sucrose in the stored sweet corn ears under normal atmosphere can indicate faster degeneration of starch and more disponibility for respiration. In general, the use of controlled atmosphere did not influence the total carotenoids content. The atmosphere of 2% O 2 and 8% CO 2 showed higher values of b* and firmness. All minimally processed sweet corn samples analyzed, independent of the conservation atmospheres, were within the acceptable microbiologic limits specified by legislation. Nevertheless the atmosphere of 2% O 2 and 8% CO 2 presented lower populations of coliforms at 35 °C, psychotrophic aerobic bacteria and filamentous fungi and yeasts. Thus, it is the most indicated atmosphere for post-harvest conservation of minimally processed sweet corns during 9 days.
Highlights
O teste presuntivo foi realizado com a inoculação de alíquotas de 1 mL das diluições preparadas de cada amostra, em três séries de três tubos, contendo tubos de Durhan invertidos no meio de cultura caldo lauril sulfato triptose (LST), incubados a 35 oC, por 24-48 horas
The purpose of this work is to evaluate the use of three different atmospheres (2% O2 + 8% CO2, 4%O2 + 8% CO2 and normal atmosphere) on the quality of minimally processed sweet corn during its conversation at 5°C for nine days
Observou-se o aumento da perda de massa do milho doce ao longo da conservação em todas as atmosferas, tendo o controle apresentando valores de perda de massa significativamente maiores em relação às atmosferas controladas 1 e 2 (Figura 1)
Summary
The purpose of this work is to evaluate the use of three different atmospheres (2% O2 + 8% CO2, 4%O2 + 8% CO2 and normal atmosphere) on the quality of minimally processed sweet corn during its conversation at 5°C for nine days. The atmosphere of 2% O2 and 8% CO2 presented lower populations of coliforms at 35 °C, psychotrophic aerobic bacteria and filamentous fungi and yeasts It is the most indicated atmosphere for post-harvest conservation of minimally processed sweet corns during 9 days. Entre os constituintes do grão do milho doce, a umidade, os carboidratos e a textura são os principais determinantes da qualidade do produto fresco (AUNG et al, 1992; OLIVEIRA JUNIOR et al, 2006). O armazenamento sob atmosfera controlada pode ser uma possibilidade de extensão da vida útil do milho doce, desde que dimensionado para o genótipo específico e nas condições de produção local. O presente trabalho teve como objetivo avaliar a influência da atmosfera controlada sob refrigeração na qualidade de milho verde do tipo
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