Abstract
Carotenoids from the leaves of the common box,Buxus sempervirens (Buxaceae), which turn red in late autumn to winter, were analyzed by reversed-phase HPLC. A novel carotenoid, monoanhydroeschscholtzxanthin (3), was isolated from the red-colored leaves. UV-VIS, MS,1H-NMR and CD spectral data showed that the structure of 3 was (3S)-2′, 3′, 4′, 5′-tetradehydro-4, 5′-retro-β, β-caroten-3-ol. As well as anhydroeschscholtzxanthin (2), the major red carotenoid in the leaves, eschscholtzxanthin (4) was identified. Very small amounts of yellow carotenoids (neoxanthin, violaxanthin, lutein and β-carotene), which are major components of green leaves, were present in the red-colored leaves. The amounts of chlorophylla andb in the leaves decreased markedly during coloration, even at the early stages, whereas those of the yellow carotenoids decreased gradually. In contrast, the content of 2, a red carotenoid, increased steadily during coloration. The biosynthetic pathway of 2 inB. sempervirens was deduced tentatively on the basis of the individual carotenoid contents during autumnal coloration.
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Abbreviations
- HPLC:
-
high performance liquid chromatography
- UV-VIS:
-
ultraviolet-visible light absorption spectra
- MS:
-
mass spectra
- 1H-NMR:
-
proton-nuclear magnetic resonance
- CD:
-
circular dichroism spectra
- EI-MS:
-
electron impact-mass spectra
- NOE:
-
nuclear Overhauses effect
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Ida, K., Masamoto, K., Maoka, T. et al. The leaves of the common box,Buxus sempervirens (Buxaceae), become red as the level of a red carotenoid, anhydroeschscholtzxanthin, increases. J. Plant Res. 108, 369–376 (1995). https://doi.org/10.1007/BF02344362
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DOI: https://doi.org/10.1007/BF02344362