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Title

Multivariate Analysis of Tronchuda Cabbage (Brassica oleracea L. var. costata DC) Phenolics: Influence of Fertilizers

AuthorsSousa, Carla; Pereira, David M.; Pereira, José Alberto; Bento, Albino; Rodrigues, M. Angelo; Dopico-García, Sonia; Valentão, Patricia; Lopes, Graciliana; Ferreres, Federico CSIC ORCID; Seabra, Rosa M.; Andrade, Paula B.
KeywordsBrassica oleracea L. var. costata DC
Tronchuda cabbage
Phenolic compounds
Organic fertilization
Nitrogen
Boron
Sulfur
Principal component analysis
Issue Date22-Feb-2008
PublisherAmerican Chemical Society
CitationJournal of Agricultural and Food Chemistry
AbstractA field experiment was carried out to investigate the effect of fertilization level on the phenolic composition of tronchuda cabbage (Brassica oleracea L. var. costata DC) external and internal leaves. Eight different plots were constituted: a control without fertilization, one with organic matter, and six experiments with conventional fertilizers (nitrogen, boron, and sulfur, two levels each). The phenolic compounds were analyzed by reversed-phase HPLC-DAD. External and internal leaves revealed distinct qualitative composition. In the internal leaves were found 15 phenolics (5 kaempferol and 10 cinnamic acid derivatives), whereas the external leaves presented 3-p-coumaroylquinic acid and 13 kaempferol derivatives. Principal component analysis (PCA) was applied to assess the relationships between phenolic compounds, agronomical practices, and harvesting time. Samples obtained with conventional practices were quite effectively separated from organic samples, for both types of leaves. In general, samples developed without any fertilization presented the highest phenolics amounts: external and internal leaves contained 1.4- and 4.6-fold more phenolic compounds than the ones that received conventional fertilizer, respectively, and the internal leaves presented 2.4 times more phenolics than the ones grown with organic amendment. Additionally, samples from organic production exhibited higher total phenolics content than those from conventional practices, collected at the same time. Samples harvested first were revealed to be distinct from the ones collected later. The results show that it is possible to grow tronchuda cabbage without excess fertilizers, with highest amounts of phenolics and reduced environment contamination.
Description9 pages, 5 figures, 2 tables.
Publisher version (URL)http://dx.doi.org/10.1021/jf073041o
URIhttp://hdl.handle.net/10261/17621
DOI10.1021/jf073041o
ISSN0021-8561
E-ISSN1520-5118
Appears in Collections:(CEBAS) Artículos

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