A purified tea extract is improved in taste by reducing a percentage of gallates in the non-polymer catechins. A process according to the present invention for the production of a purified tea extract includes subjecting a tea extract to a hydrolysis treatment, causing the tea extract to adsorb on t
A purified tea extract is improved in taste by reducing a percentage of gallates in the non-polymer catechins. A process according to the present invention for the production of a purified tea extract includes subjecting a tea extract to a hydrolysis treatment, causing the tea extract to adsorb on the activated carbon, and then bringing a basic aqueous solution or an aqueous solution of an organic solvent into contact with the activated carbon to elute the non-polymer catechins.
대표청구항▼
1. A process for producing a purified tea extract, the process comprising hydrolyzing a tea extract, allowing the hydrolyzed tea extract to adsorb on an activated carbon, and then contacting a basic aqueous solution or an aqueous solution of an organic solvent with the activated carbon, thereby elut
1. A process for producing a purified tea extract, the process comprising hydrolyzing a tea extract, allowing the hydrolyzed tea extract to adsorb on an activated carbon, and then contacting a basic aqueous solution or an aqueous solution of an organic solvent with the activated carbon, thereby eluting non-polymer catechins and producing the purified tea extract, wherein when the basic aqueous solution is contacted with the activated carbon to elute the non-polymer catechins, a flow rate of space velocity (SV) is from 2 to 10 [h−1] and a flow rate is from 1 to 30 [v/v],wherein when the aqueous solution of an organic solvent is contacted with the activated carbon to elute the non-polymer catechins, a flow rate of space velocity (SV) is from 0.1 to 10 [h−1] and a flow rate is from 1 to 15 [v/v], andwherein the activated carbon has an average pore size of from 0.5 to 10 nm, a pore volume of from 0.01 to 2.5 mL/g, and a specific surface area of from 800 to 2,000 m2/g. 2. The process according to claim 1, wherein the hydrolysis is conducted with an enzyme, a fungus or a culture having a tannase activity. 3. The process according to claim 1 or 2, wherein after said contacting the basic aqueous solution with the activated carbon to elute the non-polymer catechins, an eluate is adjusted to a pH 7 or lower. 4. The process according to claim 1, wherein after said hydrolyzing the tea extract, the hydrolyzed tea extract is allowed to adsorb on the activated carbon, the activated carbon is washed, and then, the basic aqueous solution or the aqueous solution of the organic solvent is contacted with the activated carbon, thereby eluting the non-polymer catechins. 5. The process according to claim 1, wherein a decrease in a percentage of gallate forms in the non-polymer catechins by the hydrolysis of the tea extract is 5 wt % or more based on the tea extract before the hydrolysis. 6. The process according to claim 1, wherein (i) a content of the non-polymer catechins in a solid content is from 25 to 95 wt %, (ii) a content of gallates in the non-polymer catechins is from 0 to 70 wt %, (iii) a ratio of gallic acid to the non-polymer catechins is from 0 to 0.1, and (iv) a ratio of caffeine to the non-polymer catechins is from 0 to 0.14, in the produced purified tea extract. 7. The process according to claim 2, wherein the enzyme or culture having a tannase activity is used for said hydrolyzing and a content of the enzyme or culture having a tannase activity is from 0.01 to 10 wt. % based on the non-polymer catechins in the tea extract. 8. The process according to claim 2, wherein the enzyme or culture having a tannase activity is used for said hydrolyzing and an amount of the added enzyme or culture having a tannase activity is from 1 to 300 Units/g of non-polymer catechins based on the non-polymer catechins in the tea extract. 9. The process according to claim 2, wherein the enzyme or culture having a tannase activity is used for hydrolysis and a treatment temperature with the enzyme or culture having a tannase activity is from 0 to 70° C. 10. The process according to claim 2, wherein the enzyme or culture having a tannase activity is used for said hydrolyzing, the method further comprises inactivating the enzyme of culture having a tannase activity at a temperature of from 70 to 100° C. 11. The process according to claim 2, wherein the fungus is used for said hydrolyzing and a content of the fungus is from 0.1 to 22 wt. % in the tea extract containing the non-polymer catechins. 12. The process according to claim 2, wherein the fungus is used for said hydrolyzing and a treatment temperature with the fungus is from 45 to 70° C. 13. The process according to claim 1, wherein the tea extract passes through the activated carbon at a flow rate of space velocity (SV) of from 0.5 to 10 [h−1] and at a flow rate of from 0.5 to 20 [v/v]. 14. The process according to claim 1, further compositing decolorizing the eluted non-polymer catechins.
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이 특허에 인용된 특허 (1)
Hara Yukihiko (Shizuoka JPX), Process for the production of a natural antioxidant obtained from tea leaves.
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