摘要
The effects of ethylacetate extract of red onion(Allium cepa)tunic(ACTE)on some hemodynamic and biochemical parameters were evaluated in normotensive albino rats.Blood pressure parameters were determined in anaesthetized rats orally administered ACTE(10-,20-,or 40 mg/kg)or ramipril(1 mg/kg)once daily for 14 days.Respectively,10-,20-,or 40 mg/kg ACTE produced significant(P<0.01),dose-dependent fall in systolic blood pressure,SBP(21%,27%,33%),diastolic blood pressure,DBP(6%,10%,16%),pulse pressure,PP(42%,49%,56%),mean arterial blood pressure,MAPB(13%,18%,23%)and heart rate,HR(4%,5%,7%).The highest effective dose(40 mg/kg)compared well with ramipril(1 mg/kg)with regards to SBP(41%),DBP(19%),PP(70%),MABP(29%)and HR(10%).Similar trends(decreases)were recorded for 40 mg/kg ACTE and ramipril,respectively,as regards the activities of serum enzymes:creatine kinase(60%and 65%),ALT(18%and 14%)and ALP(28%and 16%).HPLC fingerprints of the flavonoid-rich ACTE revealed that flavonols:quercetin,quercitrin,isoquercitrin,rutin and kaempferol are the active flavonoids.The results demonstrate the hypotensive effect of A.cepa tunic flavonoids initiating further investigation of their individual or synergistic contribution(s)to the observed effects.
