Resumo

ARGUMEDO DELIRA, Rosalba et al. Isolation and Chemical Transformations of Some Anti-inflammatory Triterpenes from Salvia mexicana L. var. minor Benth. Rev. Soc. Quím. Méx [online]. 2003, vol.47, n.2, pp.167-172. ISSN 0583-7693.

The acetone and methanol extracts of aerial parts of Salvia mexicana L. var. minor showed anti-inflammatory and antioxidant properties in the TPA y DPPH models respectively. The chromatography of these extracts led the isolation of β-sitosterol, betulinol, betulinic acid, ursolic acid and arbutin. The presence of these triterpenes is in agreement with previos phytochemical studies of Salvia, however this is the first time that arbutin is isolated from a species of this genus. On the other hand, since none or the isolated compound showed antioxidant properties in the DPPH model, it can be inferred that minor compounds not isolated or synergism effects could account for the antioxidant properties of the extracts. It is known that some pentacyclic triterpene derivatives with an α,β-unsaturated carbonyl in the ring A showed a better nitric oxide synthase inhibition activity that the natural triterpenes. It was decided to synthesize the methyl ester of 2-formyl-3-oxo-urs-28-oic and 2-formil-3-oxo-urs-1-en-28-oic acids from ursolic acid and evaluate them using the DPPH and TPA models. The results showed that both compounds have anti-inflammatory activity, but only the 2-formyl-3-oxo-ursol-28-oic acid methyl ester was active in DPPH assay, which is in agreement with the proposed mechanism of this test. This is the first chemical study of Salvia mexicana L. var. minor (Benth).

Palavras-chave : Triterpenos; Salvia mexicana var. minor; antiinflamatory activity; chemical transformations.

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