نتایج جستجو برای: ionone
تعداد نتایج: 330 فیلتر نتایج به سال:
The effect of the antioxidant activity of beta-carotene and related carotenoids on the free radical-oxidation of methyl linoleate in solution was examined by measuring the production of methyl linoleate hydroperoxides. Canthaxanthin and astaxanthin which possess oxo groups at the 4 and 4'-positions in the beta-ionone ring retarded the hydroperoxide formation more efficiently than beta-carotene ...
Lawsonia is a monotypic genus represented by Lawsonia inermis Linn. (syn. Lawsonia alba Lam. Lythraceae), a native of North Africa and South-West Asia, widely cultivated as an ornamental hedge and dye-plant. The leaves of L. inermis have long been used in India and Middle East countries as a cosmetic for colouring palms of hands and dyeing of hair for personal adornment [1]. The leaves are also...
Carotenoid derived volatiles are important fragrance compounds, which contribute to the scents of flowers from diverse taxa. A famous example is represented by the flowers of Osmanthus fragrans where apocarotenoids account for more than 20% of all volatiles. In the recent years, bio-degradation of carotenoids has been shown to be an important route for apocarotenoids formation. Here, we report ...
A methyl group at C7 of 11-cis-retinal allows chromophore formation but affects rhodopsin activation
The newly synthesized 11-cis-7-methylretinal can form an artificial visual pigment with kinetic and spectroscopic properties similar to the native pigment in the dark-state. However, its photobleaching behavior is altered, showing a Meta I-like photoproduct. This behavior reflects a steric constraint imposed by the 7-methyl group that affects the conformational change in the binding pocket as a...
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