Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/10111
Title: | Identification of 7,4prime-Dihydroxy-5-methoxyflavylium in ldquoDragon's Bloodrdquo: To Be or Not To Be an Anthocyanin | Authors: | Melo, Maria J. Sousa, Micaela Parola, A. Jorge Melo, J. Sérgio Seixas de Catarino, Fernando Marçalo, Joaquim Pina, Fernando |
Issue Date: | 2007 | Citation: | Chemistry - A European Journal. 13:5 (2007) 1417-1422 | Abstract: | The compound 7,4prime-dihydroxy-5-methoxyflavylium (dracoflavylium) was identified as the major red colorant in samples of the resin ldquodragon's bloodrdquo, extracted from the tree Dracaena draco. The complex network of reversible chemical reactions that dracoflavylium undergoes in aqueous solution is fully described; for the first time, all the equilibrium constants that enable a complete characterisation of the system have been obtained (Kprimea=1.6×10-4, Ka1=1.0×10-4, Ka2=3.2×10-8, KCt1=1.0×10-7, KCt2=1.3×10-10). It is concluded that the red colour is due to a stable quinoid base, A, which is the major species at pH 4-7. It is further shown that this compound does not fit the commonly accepted definitions of anthocyanidin nor 3-deoxyanthocyanidin. Similarly to synthetic flavylium salts, the natural compound 7,4prime-dihydroxy-5-methoxyflavylium gives rise to several species (multistate system) reversibly interconverted by external stimuli, such as pH. | URI: | https://hdl.handle.net/10316/10111 | DOI: | 10.1002/chem.200600837 | Rights: | openAccess |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
fulltext.pdf | 230.93 kB | Adobe PDF | View/Open |
SCOPUSTM
Citations
47
checked on May 1, 2023
WEB OF SCIENCETM
Citations
5
39
checked on Nov 2, 2024
Page view(s) 50
431
checked on Nov 6, 2024
Download(s)
390
checked on Nov 6, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.