Popova MP, Trusheva BS, Nedialkov PT, Tsvetkova I, Pardo-Mora DP, Najdenski H, Torres-García OA, Sforcin JM, Bankova VS. New
Δ-tocotrienol derivatives from Colombian propolis.
Nat Prod Res 2019;
34:2779-2786. [PMID:
30938183 DOI:
10.1080/14786419.2019.1590710]
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Abstract
Two new δ-tocotrienol derivatives with oxidized terminal chain: 5,6-dioxo-garcinoic acid (trans-13'-carboxy-5,6-dioxo-δ-tocotrienol) (2) and 5-hydroxy-8b-oxo garcinoic acid (trans-13'-carboxy-5-hydroxy-8b-oxo-δ-tocotrienol) (3), together with one known derivative garcinoic acid (trans-13'-carboxy-δ-tocotrienol) (1) were isolated from a Colombian propolis. Garcinoic acid was found as a propolis constituent for the first time. The isolated compounds and crude ethanolic extract demonstrated high antimicrobial activity against Staphylococcus aureus and Candida albicans (MICs range: 10-39 μg/ml) as well as promising antioxidant potential in DPPH assay. Compound 3 displayed highest radical scavenging activity, even higher than that of dl-α-tocopherol, used as a positive control.
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