| 摘要 |
PURPOSE:To extract efficiently useful components and obtain oolong tea drink having improved flavor, by extracting oolong tea leaves with a heated aqueous solution of Na2CO3 at a specific pH in a short time, quickly cooling the extract, adjusting the hue thereof with ascorbic acid, and adjusting the pH with NaHCO3. CONSTITUTION:Oolong tea leaves are extracted with a heated aqueous solution of sodium carbonate adjusted to 8.0-10.5pH in a short time, and used tea leaves are filtered off. The resultant filtrate is quickly cooled in a cooler, and L-ascorbic acid is added to remove the brown color formed by reducing action of the L- ascorbic acid and adjust hue thereof. Sodium hydrogencarbonate is then added thereto to adjust the pH to 6.0-6.5. Thus, oolong tea components are extracted to give the aimed oolong tea drink having improved flavor.
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