Abstract
Two novel ceramides, Candidamide A (1) with a phytosphingolipid structure, and Candidamide B (2) with a tertiary amide structure, together with 12 known compounds (3–14) have been isolated from the bulbs of Zephyranthes candida, The structures of 1 and 2 have been elucidated to be 1,3,5,6-tetrahydroxy-2-(2′-hydroxytetracosanoyl amino)-8-(E)-octadecadiene (1) and (2S,3S,4R,8E,2′R)-2-[N-(2′-hydroxyoctadecanoyl)-N-(1′′,2′′-dihydroxyethyl)-amino]-8-hexacosene-1,3,4-triol (2) on the basis of spectroscopic evidence including IR, MS, NMR (1H-NMR, 13C-NMR, DEPT, 1H–1H COSY, HSQC, HMBC). The known compounds were identified as (2S)-3′,7-dihydroxy-4′-methoxyflavan (3), (2S)-4′-hydroxy-7-methoxyflavan (4), (2S)-4′,7-dihydroxyflavan (5), 7-hydroxy-3′, 4′-methylenedioxyflavan (6), ambrettolide (7), β-sitostero1 (8), β-daucosterin (9), rutin (10), pancratistatin (11), lycorine (12), haemanthidine (13), and haemanthamine (14). In the antimicrobial assay, candidamide A (1) and candidamide B (2) displayed moderate activities against bacteria Staphylococcus aureus and Escherichia coli, and fungi Aspergillus niger, Candida albicans and Trichophyton rubrum.
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Abbreviations
- CC:
-
Column chromatography
- COSY:
-
Correlation spectroscopy
- DEPT:
-
Distortionless enhancement by polarization transfer
- HMBC:
-
Heteronuclear multiple bond correlation
- HSQC:
-
Heteronuclear single quantum correlation
- HR:
-
High resolution
- LCB:
-
Long chain base
- FA:
-
Fatty acid
- MICs:
-
Minimum inhibitory concentrations
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Acknowledgments
This work was financially supported in part by the Natural Science Foundation of Jiangsu Province (BK2004062). The authors wish to acknowledge Professor Y.-L. Wu at State Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai China, for making suggestions on this paper.
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Wu, Zp., Chen, Y., Xia, B. et al. Two Novel Ceramides with a Phytosphingolipid and a Tertiary Amide Structure from Zephyranthes candida . Lipids 44, 63–70 (2009). https://doi.org/10.1007/s11745-008-3246-6
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DOI: https://doi.org/10.1007/s11745-008-3246-6