Abstract:This study was performed to evaluate the phenolic profile, antioxidant and diuretic effects of black cumin and lady-in-a-mist seeds. In the phenolic profile, differences between the two species are significant. Qualitative and quantitative analyses of the phenolic compounds were performed using a HPLC-UV/MS method. Hyperoside was the only identified flavonoid glycoside (1.08 ± 0.01 μg·g dw plant material). The antioxidant potential of the two species was tested through several electron transfer assays, which indicated, excepting for the FRAP assay, N. damascena as exhibiting a higher free radical scavenging activity. The diuretic activity of the two extracts was tested using a rat-experimental model on acute diuresis. Administration of the ethanolic extract of N. sativa (100 mg·kg −1 ) resulted in a significant increase in urine volume, although less than found with the reference drug; in
OPEN ACCESSMolecules 2015, 20 9561 addition N. damascena extract did not present a diuretic effect. In reference to the elimination of Na + , K + and uric acid, the black cumin extract exhibited a higher natriuretic than kaluretic effect and a similar uricosuric effect with control and N. damascena. For N. damascena, the Na + /K + ratio was sub unitary, but not due to an increasing of the kaluretic effect, but mostly to a decrease of Na + excretion.