Author(s):

KM Mesbaul Alam, Irin Farjana, Tahmina Parvin Rumi and MS Uddin

Abstract: Seven different marketed brands of Shaw Wallace tea available in the local markets of Bangladesh viz, Premium Tea Bag, Super Clone, Danadar, Golden leaf, Hotel Special, Shah bag BOP, Fine Dust were studied before expiry dates to screen out their qualitative status of [viz; Caffeine, Total Polyphenol (TP), Antioxidant activity (AA), Theaflavin (TF), Thearubigin (TR), Theabrownin (TB), Highly polymerized substances (HPS), Total liquor color (TLC),The Briskness index (BI), Color index (CI), Total Catechin (TC) and nutrient contents N, P, K, Ca, Na And Fe]. All Studied parameters were found to have been varied among the teas of Shaw Wallace brand. The values of Caffeine and TP were found to be varied from 3.98 % (Premium Tea bag) to 5.5% (BOP) and 37.50% (Danadar) to 32.09% (Fine Dust) respectively. Similarly, the estimated values of TF, TR, TB, TC and TLC were detected to be maximum (1.18%, 15.76%, 12.91%, 5.17% and 5.4) in Premium tea and Danadar tea but HPS and BI contents were found to be (5.27% and 21.40) maximum in Hotel special and BOP respectively. In case of Antioxidant activity (AA), the maximum value (88.80) was gained in Golden leaf and minimum value (86.67%) in Premium tea bag. On the contrary, CI was found to be the highest (7.12) in Golden Leaf and the lowest (4.89) in Fine Dust. In Considering the total amount of Nutrient Contents (sum of N, P, K, Ca, Na and Fe), the highest value was also estimated to be 9.045% in Danadar tea and the lowest value was 7.28% in Fine Dust tea. The highest average value of N and K contents were found to be 5.14% and 2.05% in Danadar tea whilst the lowest average value of N and K contents were found to be 4.52% and 1.55% in Fine Dust tea respectively. Similarly, maximum average value of Na and Ca contents determined to be 0.17% and 1.37% in Danadar tea whereas minimum average value of Na and Ca contents were determined to be 0.95% and 0.07% ^`in Fine Dust tea respectively. In case of P and Fe content, the highest average value was detected to be 0.28% in Premium tea bag and 0.055% in Danadar Tea even as the lowest average value was detected to be 0.17% and 0.029% in Fine Dust tea respectively. The Present study concludes that Danadar tea was revealed to be superior over the other brands and all the studied brands may therefore, be ranked as: Danadar tea > Premium tea Bag > BOP tea > Super Clone Tea > Golden Leaf tea > Hotel Special tea > Fine Dust tea.

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