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The seed oil of andiroba (Carapa guianensis, Meliaceae) was found to promote collagen synthesis in normal human dermal fibroblasts. To characterize the active constituents of this oil, the collagen synthesis-promoting activities of 10 principal limonoid constituents, gedunin (1), 6α-acetoxygedunin (2), 7-deacetoxy-7-oxogedunin (3), 7-deacetoxy-7α-hydroxygedunin (4), andirolide H (5), 6α-hydroxygedunin (6), methyl angolensate (7), 17β-hydroxyazadiradione (8), and carapanosides C (9) and R (10), were examined. Among them, 1-4, 6, 7, and 9 were found to significantly promote collagen synthesis without cytotoxicity at the effective concentrations.

Collagen Synthesis-Promoting Effects of Andiroba Oil and its Limonoid Constituents in Normal Human Dermal Fibroblasts