The analgesic and anti-inflammatory effect of new oleanolic acid acyloxyimino derivative.
The new derivative of well-known triterpene, oleanolic acid: methyl 3-octanoyloxyiminoolean-12-en-28-oate 5, was synthesized by the action of caprylic acid on methyl oleanolate 3-oxime in the presence of dicyclohexylcarbodiimide in dioxane. The molecular structure of the obtained product 5 was confirmed by spectral methods. The acute toxicity, locomotor activity, and the dose-dependent analgesic activity were studied. In addition, the effect of compound 5 on morphine-induced analgesic activity, the dose-dependent anti-inflammatory activity and the effect of the compound on diclofenac anti-inflammatory activity study were performed. The results proved a low toxicity (LD₅₀ > 2 g/kg) of the tested product 5, which affected neither vertical nor horizontal locomotor activity in the given range of doses. The triterpene 5 also produced centrally mediated (morphine-like) analgesic action; however, only in the highest dose. The synergistic analgesic activity of 5 and morphine in the doses of 30.0 and 300.0mg/kg was found. Compound 5 expressed the anti-inflammatory action which did not affect the anti-inflammatory activity of diclofenac after their combined administration.
Department of Organic Chemistry, Faculty of Pharmacy, Poznan University of Medical Sciences, Grunwaldzka Str. 6, 60-780 Poznan, Poland. firstname.lastname@example.org
SourceEuropean journal of pharmaceutical sciences : official journal of the European Federation for Pharmaceutical Sciences 47:3 2012 Oct 9 pg 549-55
Toxicity Tests, Acute
Pub Type(s)Journal Article