| 摘要 |
PROBLEM TO BE SOLVED: To accumulate a large amount ofγ-aminobutyric acid which is important as nervus inhibiting transmitter and showing the vasodepressor activity in the leaves of tea by irradiating the leaves of tea before steaming with infrared rays in the range of a wavelength with heating ability. SOLUTION: The leaves of tea before steaming are irradiated with infrared rays in the range of a wavelength (normally 650 to 2500nm) with heating ability. To pout it in the concrete, the leaves are irradiated with infrared rays while stirring tea leaves in the raw state by using a roughly crumpling device provided with the radiation source of infrared rays such as an infrared lamp, a far infrared heater, e.g. In addition the irradiating temp. of infrared rays is desirably controlled to make the temp. of the irradiated tear 40 to 50 deg.C. An irradiating time is desirably 20 to 60min in the above temp. condition.
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