Capacidade antioxidante e qualidade pós-colheita de abacate 'Fuerte'
Carregando...
Data
2012-06-01
Autores
Vieites, Rogério Lopes [UNESP]
Daiuto, Érica Regina [UNESP]
Fumes, Joana Giffoni Figueiredo [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Fruticultura
Resumo
A capacidade antioxidante e a qualidade pós-colheita do abacate 'Fuerte' foram avaliadas. Os frutos foram mantidos sob temperatura ambiente (24 ± 1 ºC) e sob refrigeração em 10 ± 1 ºC e 90±5% UR e avaliados durante 15 dias. Determinaram-se a perda de massa e a taxa respiratória. As características físico-químicas avaliadas foram acidez total titulável (AT), sólidos solúveis (SS), ratio, pH, firmeza, atividade da enzima polifenoloxidase (PPO), cor (L, a* e b*), fenólicos totais e atividade antioxidante (AA) por DPPH·. Nas duas condições de armazenamento, o pico respiratório ocorreu no 9º dia.Os frutos mantidos sob temperatura refrigerada apresentaram menor perda de massa e maior firmeza em relação àqueles em temperatura ambiente. O comportamento respiratório refletiu na redução dos valores de AT e no conteúdo de SS que diminuíram a partir do pico de respiração. Os valores de pH aumentaram como consequência da diminuição da AT. Os valores de luminosidade mantiveram-se elevados, observando-se diminuição do componente de cor verde na polpa com o armazenamento. A atividade da PPO diminuiu com o armazenamento. Os valores de AA variaram de 17,6 a 68,7%. O conteúdo de fenólicos totais diminuiu após o pico respiratório, e valores crescentes de AA foram observados mesmo após o 9º dia.
Antioxidant capacity and quality of the avocado 'Fuerte' were evaluated. The fruits were maintained under room temperature (24 ± 1 ºC) and refrigeration (10 ± 1 ºC and 90±5% UR) during 15 days. Weight loss and respiratory rate were evaluated. Physical and chemical characteristics were determined: titratable acidity (TA), soluble solids (SS), ratio, pH, firmness, polyphenoloxidase (PPO) activity, color (L, a* and b*), total phenolics and antioxidant activity (AA) for DPPH·. In the two storage conditions the breathing pick happened in the 9th day. The fruits maintained under refrigerated temperature presented smaller mass loss and larger firmness than those in room temperature. The respiratory behavior result in the values of TA and content of SS that decreased starting from respiratory pick. The pH values increased as a consequence of the decrease of the TA. Brightness values stayed high, being observed a decrease of the green component color and increase of the yellow in the pulp with the storage PPO activity decreased with the storage. The values of AA varied from 17,6 to 68,7%. Total phenolics content decreases after the breathing pick and growing values of AA were observed even after the 9th day.
Antioxidant capacity and quality of the avocado 'Fuerte' were evaluated. The fruits were maintained under room temperature (24 ± 1 ºC) and refrigeration (10 ± 1 ºC and 90±5% UR) during 15 days. Weight loss and respiratory rate were evaluated. Physical and chemical characteristics were determined: titratable acidity (TA), soluble solids (SS), ratio, pH, firmness, polyphenoloxidase (PPO) activity, color (L, a* and b*), total phenolics and antioxidant activity (AA) for DPPH·. In the two storage conditions the breathing pick happened in the 9th day. The fruits maintained under refrigerated temperature presented smaller mass loss and larger firmness than those in room temperature. The respiratory behavior result in the values of TA and content of SS that decreased starting from respiratory pick. The pH values increased as a consequence of the decrease of the TA. Brightness values stayed high, being observed a decrease of the green component color and increase of the yellow in the pulp with the storage PPO activity decreased with the storage. The values of AA varied from 17,6 to 68,7%. Total phenolics content decreases after the breathing pick and growing values of AA were observed even after the 9th day.
Descrição
Palavras-chave
Persea americana Mill., atividade anti radical livre, refrigeração, compostos fenólicos, Persea americana Mill., free radical scavenger activity, refrigeration, total phenolics
Como citar
Revista Brasileira de Fruticultura. Sociedade Brasileira de Fruticultura, v. 34, n. 2, p. 336-348, 2012.