Taxonomic group: plant / Streptophyta
(Phylum: Streptophyta)
Publication DOI: 10.1016/S1010-6030(00)00320-8Journal NLM ID: 9883240Publisher: Lausanne, Switzerland: Elsevier Sequoia
Institutions: New Zealand Institute for Industrial Research, Lower Hutt, New Zealand, Laboratoire de Botanique, Phytochimie et Mycologie, Université Montpellier 1, Montpellier, France, CNRS, Lyon, France
The photostabilities of luteolin, in solution, in the presence of aluminium ions, and deposited on a cellulosic substrate have been determined and compared with those of quercetin and other 5-hydroxyflavonols and their 3-O-glycosides. In aqueous methanol solution, luteolin and flavonol 3-glycosides exhibited no degradation over periods of up to 15 h of UV irradiation. However, the flavonols studied were all found to degrade and their relative photostabilities correlate with their redox potentials. Quercetin was the least stable. In the presence of aluminium ions, all the flavonoids, including luteolin, were degraded by UV irradiation. In contrast to the absorption spectra in dilute solution, the reflectance spectra of both quercetin and luteolin deposited on a cellulosic substrate exhibited strong absorptions beyond 400 nm. On this substrate these flavonoids displayed the characteristic yellow colour associated with flavonoids in some environments. Although the quercetin yellow faded rapidly on exposure to UV radiation, the colour of luteolin darkened. This was due to the formation of a photoproduct absorbing maximally at 450 nm. The relevance of these observations to cellulosic dyeing and flower colouration are discussed.
5-hydroxyflavones; flavonols; luteolin; quercetin
Structure type: monomer
Location inside paper: p. 88, Fig. 1
Trivial name: glucoluteolin, luteolin 7-glucoside
Compound class: saponin glycoside, glycoside, flavonoid glycoside, flavonol glycoside, flavone glycoside, flavone glucoside
Contained glycoepitopes: IEDB_142488,IEDB_146664,IEDB_613439,IEDB_983931,SB_192
Methods: UV, spectrophotometry
Related record ID(s): 67948, 67949, 67950
NCBI Taxonomy refs (TaxIDs): 33090Reference(s) to other database(s): CCSD:
50066, CBank-STR:939
Show glycosyltransferases
There is only one chemically distinct structure:
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