Free amino acids of tronchuda cabbage (Brassica oleracea L. var. costata DC): Influence of leaf position (internal or external) and collection time

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Andreia P Oliveira (Author) Other; David M Pereira (Author) Other; Paula B Andrade (Author) FFUP; Patricia Valentao (Author) FFUP; Carla Sousa (Author) REIT; Jose A Pereira (Author) Other; Albino Bento (Author) Other; Manuel Angelo Rodrigues (Author) Other; Rosa M Seabra (Author) Other; Branca M Silva (Author) Other

Journal

Title: Journal of Agricultural and Food Chemistry

Vol. 56 No. 24

Pages: 5216-5221

ISSN: 0021-8561

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 13 Citations

Scopus - 20 Citations

Scientific classification

FOS: Agrarian Sciences > Other Agrarian Sciences

Other information

Authenticus ID: P-003-XSW

DOI: 10.1021/jf800563w

Resumo (PT): The free amino acid profile of 18 samples of tronchuda cabbage (Brassica oleracea L. var. costata DC) leaves, harvested at three different months, was determined by HPLC/UV−vis. The tronchuda cabbage leaves total free amino acid content varied from 3.3 to 14.4 g/kg fresh weight. Generally, arginine was the major compound, followed by proline, threonine, glutamine, cysteine, and glutamic acid. This study indicates that free amino acids are not similarly distributed: in external leaves, proline and arginine were the major free amino acids, while in internal ones, arginine was the main free amino acid, followed by threonine, glutamine, and cysteine. Significant differences were observed for valine, proline, arginine, leucine, cysteine, lysine, histidine, and tyrosine contents. The levels of some free amino acids were significantly affected by the collection period. In external leaves, this occurred with glutamic acid, serine, valine, leucine, cysteine, and ornithine contents, while in internal leaves, it occurred with aspartic acid, arginine, and total contents. <br> <br> <a target="_blank" href="http://pubs.acs.org/doi/abs/10.1021/jf800563w"> Texto integral </a> <br> <br>

Abstract (EN): The free amino acid profile of 18 samples of tronchuda cabbage (Brassica oleracea L. var. costata DC) leaves, harvested at three different months, was determined by HPLC/UV-vis. The tronchuda cabbage leaves total free amino acid content varied from 3.3 to 14.4 g/kg fresh weight. Generally, arginine was the major compound, followed by proline, threonine, glutamine, cysteine, and glutamic acid. This study indicates that free amino acids are not similarly distributed: in external leaves, proline and arginine were the major free amino acids, while in internal ones, arginine was the main free amino acid, followed by threonine, glutamine, and cysteine. Significant differences were observed for valine, proline, arginine, leucine, cysteine, lysine, histidine, and tyrosine contents. The levels of some free amino acids were significantly affected by the collection period. In external leaves, this occurred with glutamic acid, serine, valine, leucine, cysteine, and ornithine contents, while in internal leaves, it occurred with aspartic acid, arginine, and total contents.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6