Antibacterial activity of labdane diterpenoids from Stemodia foliosa.
JOURNAL OF NATURAL PRODUCTS 2008;
71:1291-1293. [PMID:
18582112 DOI:
10.1021/np800106x]
[Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
As part of a continuing interest in exploring the chemistry of Brazilian medicinal plants, three new labdane diterpenoids, 6alpha-acetoxymanoyl oxide (1), 6alpha-malonyloxymanoyl oxide (2), and 6alpha-malonyloxy-n-butyl ester manoyl oxide (3), together with the known betulinic acid, lupeol, sitosterol, and stigmasterol, were isolated from the aerial parts of Stemodia foliosa. The structures of 1-3 were established on the basis of interpretation of spectroscopic data, including HRESIMS, and 1D and 2D NMR techniques. All compounds were tested against a bacteria panel consisting of Staphylococcus aureus, Bacillus cereus, B. subtilis, B. anthracis, Micrococcus luteus, Mycobacterium smegmatis, and M. phlei. Compound 2 showed moderate activity against these strains, with MIC values in the range 7-20 microg/mL.
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