RESUMO
The aim of this study was to enhance the therapeutic index of Fungizone(®). For this reason we have prepared stock solutions of Fungizone(®) under different conditions of pHs (from 4.8 to 10.8) and temperatures (unheated solutions and heated ones during 20 min at 70 °C). Then we have evaluated the effect of those antifungal solutions on human red blood cells coming from one healthy donor, as well as on the dormancy of Candida albicans strain. The obtained results show that after exposure to antifungal stock solution prepared at pH 5.4 and heated during 20 min at 70 °C, the rate of hemolysis was largely reduced (only 5% of hemolysis). On the other hand, it is noticed the yeast regrowth after 26 h whatever is the temperature or the pH of the stock solution. However at pH 5.4, the growth of C. albicans is inhibited at 75% in comparison with the one obtained with the conventional Fungizone(®) after 30 h of culture where we observed 100% of growth. So, stock solution of Fungizone(®) prepared at pH 5.4 and heated 20 min at 70 °C seems to be a good strategy for enhancing the therapeutic index of Fungizone(®).
Assuntos
Anfotericina B/farmacologia , Antifúngicos/farmacologia , Anfotericina B/química , Antifúngicos/química , Antifúngicos/toxicidade , Candida albicans/efeitos dos fármacos , Candida albicans/crescimento & desenvolvimento , Eritrócitos/efeitos dos fármacos , Hemólise , Humanos , Concentração de Íons de Hidrogênio , Soluções , TemperaturaRESUMO
Phytochemicals are extensively found at different levels in many medicinal plants. To investigate the phenolic compound content and in vitro antioxidant activity of hydro-methanolic extract from Prasium majus L. (Lamiaceae). The present investigation comprises, estimation of total polyphenol, flavonoid, tannin, in vitro antioxidant assays such as total antioxidant capacity, DPPH, ABTS, beta-carotene and ferric reducing power. P. majus exhibited 64.25 mg GAE g(-1) extract of polyphenol phenol content and better scavenging activity of DPPH (IC50 = 7.95 microg mL(-1)), ABTS*+ (IC50 = 373.78 microg mL(-1)) and beta-carotene (IC50 = 122.56 microg mL(-1)). Our results clearly demonstrated that hydro-methanolic extract P. majus has antioxidant capacity. Therefore is a valuable source of natural antioxidants.