+ Site Statistics
+ Resolve Accession
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
Submit PDF Full TextSubmit PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Malvidin-3-O-glucoside-5-O-(6-acetylglucoside) and its colour manifestation in 'Johnson's Blue' and other 'blue' geraniums

, : Malvidin-3-O-glucoside-5-O-(6-acetylglucoside) and its colour manifestation in 'Johnson's Blue' and other 'blue' geraniums. Phytochemistry 45(2): 417-423

A study of the physicochemical factors contributing to flower colour in three 'blue' geraniums, 'Johnson's Blue', G. pratense and G. sanguineum, has led to an understanding of how such colour variants are produced in geraniums. All three contain the same new anthocyanin, malvidin-3-O-beta-D-glucopyranoside-5-O-beta-D- [6-O-acetylglucopyranoside], the structure of which was established by 2D-NMR techniques. This anthocyanin is an isomer of the malividin-3-O-beta-D-[6-O-acetylglucopyranoside] -5-O-beta-D-glucopyranoside reported recently from G. sylvaticum, but it was indistinguishable by HPLC from the pigment sourced from a locally available G. sylvaticum. It was accompanied in 'Johnson's Blue' and G. pratense with kaempferol and myricetin 3-O-glucosides and 3-O-sophorosides, but with only low levels of flavonols in G. sanguineum. The pH values of pressed juice from these flowers were 5.4, 5.4 and 4.6, respectively. In in vitro colour reconstitution experiments, the petal spectra of 'Johnson's Blue' and G. pratense could only be produced from the anthocyanin at near vacuolar concentrations, in the presence of molar excesses of kaempferol-3-O-sophoroside (the major copigment) and at a pH of 6.6 to 6.8. It is concluded that the pH of epidermal cell vacuoles in these flowers is 1-1.4 units higher than that of the pressed juice. In vitro colour reconstitution of this type is proposed as a convenient method for determining the approximate pH of anthocyanin-containing epidermal cell vacuoles. The colours and colour stabilities of all three studied flowers can be adequately accounted for by the pigment structure and concentration, the flavonol type and ratio, and the epidermal pH.

Order PDF Full Text


Click here to order any other PDF Full Text

Accession: 002889572

DOI: 10.1016/s0031-9422(96)00831-x

Download PDF Full Text: Malvidin-3-O-glucoside-5-O-(6-acetylglucoside) and its colour manifestation in 'Johnson's Blue' and other 'blue' geraniums

Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:

Other references

Zhang, J.; Eckelman, C., 1993: The bending moment resistance of single-dowel corner joints in case construction. This study was carried out to obtain background information concerning the bending moment resistance of single-pin dowel joints in particle-board and also to provide the background information needed to formulate expressions for predicting the ben...

Gale Raj-Reichert, 2013: Safeguarding labour in distant factories Health and safety governance in an electronics global production network. One of the many concerns over workers in the electronics industry is their health and safety conditions in factories. Lead firms in the electronics industry use a variety of self-regulatory private standards and codes of conduct to govern health a...

Dautova, M.; Overmars, H.; Schots, A.; Gommers, F.J.; Bakker, J.; Smant, G., 2001: A novel cell wall degrading enzyme in the plant parasitic nematode Meloidogyne incognita. Single pass 5-prime end sequencing of approximately 1,000 clones from a cDNA library constructed of preparasitic M. incognita J2 has revealed a partial sequence with a homology to xylanases of various bacterial origin. This expressed sequence tag...

Rasskazova T.V.; Gaidenko A.I.; Svezhentseva N.A.; Mogilevskaya Z.I., 1985: Toxicity of the cutting fluid sinkho 1. Gigiena Truda i Professional'nye Zabolevaniya (11): 53

Goodman, J.; Stanley, O., 2005: Losing it in New Guinea: the voyage of HMS Rattlesnake. The voyage of the HMS Rattlesnake to New Guinea and the archipelago to the east of it could have achieved so much for science. 'Make sure of what you do', enthused British hydrographer Francis Beaufort to the Rattlesnake's commander...

Anonymous, 1982: Argon laser photocoagulation in bleeding peptic ulcers. Lancet 1(8263): 99-99

Kollmann, M., 1915: Les fosses nasales des Lemuriens. C R Ass franc avanc Sci Paris. 1914( ); 43 491-495

Puska; Mäkinen; Manninen; Nieminen, 1989: Screening of positrons in semiconductors and insulators. Physical Review. B, Condensed Matter 39(11): 7666-7679

Chubko, A.P., 1976: Indicators of central hemodynamics in primary arterial hypertension in young persons. Vrachebnoe Delo: 3-6

Tewari V. C., 1997: Revised chronostratigraphy, macrobiota, ichnofacies and isotopic signatures of the Garbyang Formation, Tethyan Basin, Garhwal Himalaya. Proceedings of the Indian Science Congress 84(4): 92