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'Anthocyanins' in keywords Facet   Publication Year 1999  [X]
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1Author    Judit Kissim, Á. Gnes Tantos3, Annam Ária, M. Észáros3, ErzsébetJ. Ám Bor-Benczúrb, G. Ábor Horváth3Requires cookie*
 Title    Stress Alterations in Growth Parameters, Pigment Content and Photosynthetic Functions of in vitro Cultured Plants  
 Abstract    Effects of different concentrations of glucose, sucrose and the natural growth regulator, triacontanol were studied under the unfavourable stress conditions of micropropagation of two woody plants, Sorbus rotundifolia L. and Primus x davidiopersica 'Piroska'. After 4 -6 weeks of cultures, the number and length of shoots, the photosynthetic activity as well as the chlorophyll, carotenoid and anthocyanin contents were investigated. As shown by the growth parameters, the optimal carbohydrate concentration was between 1 .5 -2 .5 % , whereas in higher concentrations, a definite inhibition could be observed. A similar response was found in changes of the anthocyanin content in Prunus x davidiopersica 'Piroska', but this effect was less pronounced with the photosynthetic pigments in both species. The Fv/Fm ratio representing the quantum yield of photosynthesis was low due to the inhibitory effect of stress and altered significantly by changing the carbohydrate concentrations. In all cases, the addition of 2 -4 jig triacontanol/1 further enhanced the stimulating effect of the optimal carbohydrate concentrations, which indicated the specific importance of the appropriate hor­ mone balance under such stress conditions. 
  Reference    Z. Naturforsch. 54c, 834—8 (1999); received November 28 1998/March 18 1999 
  Published    1999 
  Keywords    Anthocyanin, Fluorescence, Huckberry, Peach, Triacontanol 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0834.pdf 
 Identifier    ZNC-1999-54c-0834 
 Volume    54 
2Author    Janina Gabrielska3, Jan Oszmiańskib, Małgorzata Komorowskac, Marek Langner3Requires cookie*
 Title    Anthocyanin Extracts with Antioxidant and Radical Scavenging Effect  
 Abstract    The antioxidative activity of three anthocyanin pigments, extracted from the fruits of chokeberry, honeysuckle and sloe, were studied. Lipid oxidation in the liposome membrane, induced by UV radiation, was evaluated with a thiobarbituric acid-reactive substances assay. The antioxidant efficiency of the studied compounds follows this sequence: chokeberry > sloe > honeysuckle. The extract concentrations at which a 50% reduction of phosphatidylcho­ line oxidation was observed, were respectively: 48, 54 and 60 mg/1. The end products of lipid membrane oxidation were evaluated using HPLC. It was found that the antioxidative potency of anthocyanin extracts is concentration-dependent. As shown by E P R technique the effi­ ciency of the extracts to eliminate free radicals from the solution follows the order of the antioxidant activity. 
  Reference    Z. Naturforsch. 54c, 319 (1999); received December 2 1998/January 22 1999 
  Published    1999 
  Keywords    Antioxidant, Anthocyanin, Liposome, TBA -Reactive Product 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0319.pdf 
 Identifier    ZNC-1999-54c-0319 
 Volume    54