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2001 (1)
1Author    Tytti Kujala, Jyrki Loponen, Kalevi PihlajaRequires cookie*
 Title    Betalains and Phenolics in Red Beetroot (Beta vulgaris) Peel Extracts: Extraction and Characterisation  
 Abstract    The extraction of red beetroot (Beta vulgaris) peel betalains and phenolics was compared with two extraction methods and solvents. The content of total phenolics in the extracts was determined according to a modification of the Folin-Ciocalteu method and expressed as gallic acid equivalents (G A E). The profiles of extracts were analysed by high-performance liquid chromatography (HPLC). The compounds of beetroot peel extracted with 80% aqueous methanol were characterised from separated fractions using HPLC-diode array detection (H PL C -D A D) and HPLC-electrospray ionisation-mass spectrometry (H PLC-ESI-M S) tech­ niques. The extraction methods and the choice of solvent affected noticeably the content of individual compounds in the extract. The betalains found in beetroot peel extract were vulgaxanthin I, vulgaxanthin II, indicaxanthin, betanin, prebetanin, isobetanin and neobe-tanin. A lso cyclodopa glucoside, /V-formylcyclodopa glucoside, glucoside of dihydroxyindol-carboxylic acid, betalamic acid, L-tryptophan, p-coumaric acid, ferulic acid and traces o f un­ identified flavonoids were detected. 
  Reference    Z. Naturforsch. 56c, 343 (2001); received January 9/February 12 2001 
  Published    2001 
  Keywords    Beta vulgaris, Betalains, Phenolics 
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 TEI-XML for    default:Reihe_C/56/ZNC-2001-56c-0343.pdf 
 Identifier    ZNC-2001-56c-0343 
 Volume    56