Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.18/1204
Título: Comparison of leafy kale populations for their bioactive compound content: phenolics, glucosinolates, carotenoids, and chlorophylls
Autor: Ferioli, F.
Giambanelli, E.
D'Antuono, L.F.
Costa, H.S.
Albuquerque, T.G.
Sanches-Silva, A.
Hayran, O.
Koçaoglu, B.
Palavras-chave: Composição dos Alimentos
Nutrição Aplicada
Data: Out-2012
Resumo: Introduction. Kales represent leafy forms and primitive types of Brassica oleracea L. They are traditional crops of several European areas (Italy, Netherlands, Portugal, Scotland, Spain, Turkey), rooted in local farming and food systems, and employed in the preparation of traditional dishes. Owing to similar aspects in their utilisation, kales appear a proper subject for a cross-country comparison. Furthermore, kales have gained increased attention due to their high content of healthy phytochemicals such as carotenoids, glucosinolates (GLS) and phenolics. The present investigation is aimed to compare different kale populations, either from local sources or cultivated in a common environment, for their bioactive amounts. Materials and methods. 25 kale samples were sampled from Italian, Portuguese, and Turkish local crops or markets. For the experimental trial, 15 kale seed samples were obtained from local seed companies or farmers, and planted in nursery. The plants were transplanted in a field located in Cesena (Italy). After freeze-drying, bioactives were extracted by proper solvent systems, quantified by HPLC, and identified by HPLC-mass spectrometry or standard compounds. Results. Total phenolics, GLS, carotenoids (lutein and beta-carotene), and chlorophylls were in the range 8310-38110, 755-8580, 135-2354, and 1740-16924 mg kg-1 d.m., respectively. Growing environment did not consistently influence phenolic content. Both local and experimental Portuguese samples showed higher phenolic levels in comparison to those determined in Italian and Turkish kales. A high variability was noticed within local populations. Even in case of GLS, a remarkable variability was assessed in local populations and higher amounts of these bioactives were determined in Portuguese kales in comparison to Italian and Turkish samples. Aliphatic GLS accounted for 60 and 40% of total GLS in experimental and local Portuguese kales, respectively, whereas indolic GLS were mainly quantified in Italian and Turkish populations. Local samples showed a total GLS amount about twice higher in comparison to experimental populations having the same geographical origin. On the contrary, pigments were significantly more abundant in experimental samples in comparison to local kales, owing to the higher soil fertility level. Conclusions. The first cross-country comparison of local kale types has been carried out as regards phytochemical amounts. Geographical origin and growing environment appeared as significant factors in determining bioactive levels in leafy kales and then nutritional and sensorial attributes of plants.
Descrição: Comunicação científica a convite.
Poster publicado em: BaSeFood Newsletter - Special Issue n.º7, October 2012 - Traditional Food International 2012, p. 47. ISBN: 978-88-902152-6-1
Peer review: yes
URI: http://hdl.handle.net/10400.18/1204
Aparece nas colecções:DAN - Apresentações orais em encontros internacionais

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