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A keto derivative of pyran.
Synonym(s): pyranone
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
Carbonyl group of ketone is more deshielded than carbonyl group of ester due to deshielding effect of pyrone ring [42].
Naringenin is a naturally occurring polyphenolic compound containing two benzene rings linked together with a heterocyclic pyrone ring [16].
pyrone type, chromene, diketone, or quinone groups) and delocalised [pi]-electrons of the basal planes are assumed to have a basic nature (Contescu et al.
It is a member of a group of naturally occurring compounds, the flavonoids, which have a common flavone nucleus composed of two benzene rings, linked through a heterocyclic pyrone ring.
Recent studies have involved nitrogen and oxygen heterocycles, particularly compounds of the pyridine and pyrone families, and the techniques of chromatography (including HPLC), mass spectrometry, GCMS, chemical ionization mass spectrometry and NMR (both 1H and 13C) are used extensively.
The ethylenic double bond of 4-oxo-4H-benzopyran-3-carbaldehyde (3-formyl chromone) is a very reactive system towards nucleophiles, owing to the presence of aldehydic and pyrone carbonyl groups linked to it [23].
[sup.13]C-NMR spectrum of 4a showed characteristic absorptions responsible for 11 carbon atoms at [delta]164.5 ppm for C = O, [delta]151.6 and [delta]114,1 ppm for pyrone C, [delta]147.2 ppm and [delta]145.5 ppm for triazole C and 5144.9, [delta]128.1, [delta]125.3, [delta]125.0, [delta]124.9, [delta]119,6 ppm for aromatic C.
Antagonistic action is attributed through competition for space and nutrients (23), production of siderophores (3,29), synthesis of inhibitory compounds (pyrone antibiotics) (5) and the release of cell wall lytic enzymes including cellulytic, chitinolytic, pectinolytic, proteolytic and lipolytic enzymes (6).
Generally the antioxidant capacity of anthocyanins is associated with the number of free hydroxyls around the pyrone ring, but this is not always true [24].