1 eV, (4) phenolic (aromatic C connected to O group (COH) in phenols) and ketonic
C (carbonyl substituted aromatic structures of quinones, phenols and ketones) at 286.
These algae also contain some minor carotenoids among which canthaxanthin and astaxanthin, both with ketonic
groups; stand out (Whittle and Casselton, 1975; Karlson et al.
Formation of yellow-orange coloration indicates the presence of a ketonic
It was observed that the sample is composed of the alcohols, amines and ketonic
Nalmefene has a methylene radical (C=CH2) substituted by a ketonic
group (C=O) in position 6 with respect to naltrexone, and in comparison with naltrexone it has greater bioavailability (40-50%), a longer half life and greater affinity for delta and kappa opioid receptors.
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20 suggested that the C-3 in compound (4) was ketonic
rather than alcoholic.
The presence of OH COOH or ketonic
group and a double bond in these fractions were liable to be reacted with the cell membrane and cellular contents of both superficial and deeper layers of epidermis causing irritancy.
This category featured a furan ring at C-14, 15, 16 positions and a ketonic
group at C-1 or C-3 position.
Johnson, "Metabolism of ketonic
acids in animal tissues," The Biochemical Journal, vol.
Bjorkhem (35) also reported that at least a small fraction of fatty acids may be subject to primary [omega]-oxidation prior to [beta]-oxidation in the ketonic
They probably form the more stable ketonic
and aldehydic groups, by the migration of the low-molecular mass oxidized material, e.