Conservação de toletes de palmito Pupunha (Bactris gasipaes Kunth) "in natura" sob refrigeração e atmosfera modificada / Preservation of Pupunha (Bactris gasipaes Kunth) hearts of palm "in natura" under refrigeration and modified atmosphere

AUTOR(ES)

Sílvia Regina de Toledo Valentini

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

22/02/2010

RESUMO

This study aimed to quantify the respiratory rate, ethylene production and enzymatic activity of Pupunha hearts of palm and to determine the temperature for preserving the product, and to evaluate modified atmosphere packaging systems for product conservation. The first test aimed to quantify the respiratory rate and ethylene production of Pupunha hearts of palm stored at 25.0oC, 10.0oC, 5.0oC and 1.5oC and 85 ± 5% RH. The analysis of the concentration of oxygen (O2), carbon dioxide (CO2) and ethylene (C2H4) were made by gas chromatography. The weight loss was also determined. The storage temperatures effected the respiratory rate and C2H4 concentration of Pupunha hearts of palm. In the second experiment, Pupunha hearts of palm were harvested during the summer and winter. The hearts of palm were stored at 10.0 ± 1oC, 5.0 ± 1oC and 1.5 ± 1oC at relative humidity of 85 ± 5%. The yield of the stems cut in the winter was 30% lower and the hearts of palms were tougher. Weight loss was higher for hearts of palm harvested in the summer. Tritatable acidity and pH were not affected by the harvesting season. In the third assay, Pupunha hearts of palm were packed with stretchable PVC and LDPE films and with a polyolefinic film (CT301) and stored at 5oC. The low O2 concentration in the PVC packagings did not affect C2H4 concentration and the peroxidase activity. Hearts of palm packed in PVC and stored at 5.0oC were microbiologically safe up to the 15th postharvest day, and those packed in LDPE and CT301 up to the 6th day. The low O2 concentration in the PVC packaging reduced microbial deterioration

ASSUNTO(S)

fisiologia pós-colheita peroxidase processamento mínimo postharvest physiology peroxidase minimal processing

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