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Journal cover: British Food Journal

British Food Journal

ISSN: 0007-070X

Online from: 1899

Subject Area: Industry and Public Sector Management

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The chemical composition of some garden Dahlia tubers

Document Information:
Title:The chemical composition of some garden Dahlia tubers
Author(s):Consolate Nsabimana, (State Key Laboratory of Food Science and Technology, Jiangnan University, Jiangsu, China), Bo Jiang, (State Key Laboratory of Food Science and Technology, Jiangnan University, Jiangsu, China)
Citation:Consolate Nsabimana, Bo Jiang, (2011) "The chemical composition of some garden Dahlia tubers", British Food Journal, Vol. 113 Iss: 9, pp.1081 - 1093
Keywords:Common garden Dahlia, Dahlia cultivars, Dahlia tubers, Minerals, Proximate composition, Vitamins
Article type:Research paper
DOI:10.1108/00070701111174541 (Permanent URL)
Publisher:Emerald Group Publishing Limited
Acknowledgements:The authors would like to thank Lanzhou Peony Horticulture Development Company for supplying the raw materials and Jiangnan University for providing the financial support needed to carry out such a pioneering research project.

Purpose – Dahlia is an ornamental plant originating from Mexico where it is considered as the National flower. The purpose of this paper is to investigate tubers from yellow, white and red-flowered cultivars of the common garden Dahlia (D. pinnata) for their chemical composition.

Design/methodology/approach – The composition of minerals was determined using Atomic Absorption Spectrometry (AAS), whereas vitamins were analyzed by High-Performance Liquid Chromatography (HPLC).

Findings – Carbohydrates represented the major constituent in Dahlia tubers, followed by fibre and protein. Tubers of the yellow-flowered cultivar “HGH” contained the highest amount of carbohydrates, while tubers of the white-flowered cultivar “BJ” and those of the red-flowered cultivar “XM” abounded in fibre and protein, respectively. In addition, Dahlia tubers exhibited varying concentrations of minerals, among which potassium, calcium, magnesium, phosphorus, zinc and chromium were predominant. Tubers of the white-flowered cultivar “LB” contained the highest amounts of magnesium and phosphorus. Moreover, tubers of the red-flowered cultivar “MLH” showed the highest contents of potassium and chromium, whereas those of the red-flowered cultivar “XM” were rich in calcium and zinc. Furthermore, Dahlia tubers were found to contain water and fat soluble vitamins, among which vitamins B2, B6, B7 and E were the most abundant. Tubers of the white-flowered cultivar “BJ” exhibited the highest contents of water soluble vitamins, whereas those of the white-flowered cultivar “LB” abounded in fat soluble vitamins.

Originality/value – Despite the considerable variability observed among cultivars, Dahlia might be utilized as an alternative food resource for human nutrition.

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