02277nas a2200217   4500008004100000245007700041210006900118260001800187300000900205490000600214520164100220653001401861653002201875653001301897653001901910653001901929100002301948700002101971700002301992856004402015       2009                        eng d00aDiuretic activity of Sri Lankan black tea (Camellia sinensis L.) in rats0 aDiuretic activity of Sri Lankan black tea Camellia sinensis L in  cJanuary 2010   a4-100 v13 a<p class="rtejustify">The aim of this study was to evaluate the diuretic potential of Sri Lankan black tea (<em>Camellia sinensis</em> L.). This was assessed in rats using high grown Dust grade No: 1 tea, which is consumed widely by the tea drinkers worldwide. Different doses of hot black tea brew (BTB) (84, 167, 501 or 1336 mg/ml respectively equivalent to 1.5, 3, 9 and 24 cups) were made and orally administered to previously starved (24 h) but subsequently hydrated (with 15 ml of isotonic saline) rats and their urinary output was monitored cumulatively at hourly intervals for 6h. The reference drug used was frusemide (13 mg/kg). The results showed that BTB induced significant (P &lt; 0.05), mild to moderate and dose- dependent diuresis (starting from 167 mg/ml). This diuretic activity had a fairly rapid onset (within 2 h) and relatively short duration of action (3 h). BTB also significantly (P &lt; 0.05) increased the overall urinary frequency. Further, the diuretic activity of BTB was less potent to frusemide (by 45%). Decaffeination of black tea almost completely abolished the diuresis. The diuresis of the BTB was solely due to increased (by 55 %) urinary Na+ excretion (with no urinary K+ loss). Further, the chronic daily administration of the BTB did not develop tolerance or induce toxicity (general, renal and hepatic). It is concluded that BTB made from Sri Lankan high grown Dust grade No :1 tea has safe, mild to moderate diuretic activity with rapid onset and relatively short duration of action. Further, this study supports the claim made by Sri Lankan indigenous physicians that it is a diuretic.</p>
10aBlack tea10aCamellia Sinensis10aDiuresis10aDust grade tea10aSri Lankan tea1 aRatnasooriya, W.D.1 aFernando, T.S.P.1 aRanatunga, R.A.A.R  uhttps://phcogres.com/article/2009/1/1-0