Composição bioativa de cenoura em função da época de colheita e do processamento mínimo
2013
Silva, Elisa Gonçalinho | Alegria, Carla Sofia Marques | Abreu, Marta Maria Nogueira | Martins, Margarida Moldão
Mestrado em Engenharia Alimentar - Qualidade e Segurança Alimentar - Instituto Superior de Agronomia
显示更多 [+] 显示较少 [-]From the bioactive composition characterization of cv. Nantes carrot considering tissue type (peel, cortex and vascular tissues) and harvest season (winter vs. summer), it was concluded that both factors affect significantly this composition. Carrots from the summer harvest showed to have about four times higher total phenolic and carotenoid contents than the winter ones. The cortex is the most representative carrot tissue (71-82%) and holds higher contents of total phenolics (49-69%) and carotenoids (78-85%) than the remaining tissues – peel and vascular tissues. Therefore, the cortex is the tissue that contributes the most toward carrots’ total antioxidant capacity (61-72%), mainly of hydrophilic nature (>90%) which is directly related to the respective phenolic composition. In minimal processing, the peeling and decontamination unit operations lead to significant losses in carrots’ bioactive composition, accounting for decreases of 58% for phenolics and of 52% for carotenoids regarding the raw material. These losses were compensated during storage of minimally processed carrot packed in a microperforated film, namely due to induced phenolic synthesis, reaching by day 7 similar levels to those evaluated in the raw material, with maintenance of the carotenoid content, pH and soluble solids content.
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