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Advisor(s)
Abstract(s)
Galega kale (Brassica Oleracea L. var. Acephala) is a vegetable quite common in several countries. It
presents high moisture content at harvest, so it can only be preserved for a few days under room
temperature. Therefore, drying processes can be employed to increase its shelf-life. However, drying
exposes the product to high temperatures that can result in some losses of flavour, texture, colour and
nutrients. To minimize these detrimental effects, several pretreatments may be used as possible strategies
to improve nutritional attributes and sensory properties, after dehydration and during long-term storage.
The objective of this work was to evaluate the effect of six pretreatments on quality and nutritional
contents of Galega kale submitted to convective air drying. Water and steam blanching, simple or combined
with chemical treatments, were applied to kale samples before convective drying. When compared to the
absence of pretreatment, steam blanching provided improvements on retention percentages of 7.3 and
13.6% for vitamin C and total antioxidant capacity, respectively. Regarding pigments, steam blanching
enabled higher retention of total chlorophylls. Total phenolic content was the only nutritional parameter in
which steam blanching preceded by chemical treatment with metabisulfite provided better results than
isolated steam blanching.
Steam blanching for 1 min, without the need of previous chemical treatment, applied to kale samples
before drying, demonstrated to be a valuable approach to reduce deterioration of the majority of the
parameters in study, and also improved significantly the appearance of Galega kale after the drying process.
Description
Keywords
Galega kale Drying Pretreatments Nutrients Quality
Citation
ARAÚJO, Ana C.; OLIVEIRA, Sara M.; RAMOS, Inês N.; BRANDÃO, Teresa R. S.; SILVA, Cristina L. M - Effect of pretreatments on quality parameters and nutritional compounds of dried Galega kale (Brassica Oleracea L. Var. Acephala). In 29th EFFoST Conference - Food Science Research and Innovation: Delivering Sustainable Solutions to the Global Economy and Society, Athens, Greece, 10-12 November 2015. – In DERMESONLOUOGLOU, Efimia …[et al.] (ed.) - Proceedings 29th EFFoST Conference. Athens: NTUA, School of Chemical Engineering, 2015. ISBN 978-618-82196-1-8. Vol. 2, p. 840-845