EXTRACTS AND BEVERAGES CONTAINING 2,5-PIPERAZINEDIONE,3,6-BIS(PHENYLMETHYL)-, (3S,6S)-
The present invention aims to provide extracts or beverages containing 2,5-piperazinedione,3,6-bis(phenylmethyl)-,(3S,6S)—, which is a useful substance with an improving effect on learning motivation, in an easy-to-ingest form and at a high concentration. Extracts or beverages whose ratio between the content of 2,5-piperazinedione,3,6-bis(phenyl-methyl)-,(3S,6S)— (unit: μg/100 g) and Brix(Bx) is 6 (μg/100 g)/Bx or more can be ingested continuously over a long period of time as foods and beverages useful for improvement of learning motivation.
1 . An extract containing 2,5-piperazinedione,3,6-bis(phenylmethyl)-,(3S,6S)— and having a pH of 5 or more, wherein the ratio between the content of 2,5-piperazinedione,3,6-bis(phenylmethyl)-,(3S,6S)— (μg/100 g) and Brix (Bx) is 6 (μg/100 g)/Bx or more.
2 . The extract according to claim 1 , which contains 2,5-piperazinedione,3,6-bis(phenylmethyl)-,(3S,6S)— at a concentration of 60 μg/100 g or more.
3 . The extract according to claim 1 or 2 , wherein 2,5-piperazinedione,3,6-bis(phenylmethyl)-,(3S,6S)— is extracted from a naturally occurring product.
4 . The extract according to claim 3 , wherein the naturally occurring product is meat of livestock or poultry, fish meat, or shellfish meat.
5 . The extract according to claim 3 or 4 , wherein the naturally occurring product is chicken meat.
6 . A dried extract obtainable by drying the extract according to any one of claims 1 to 5 .
7 . A capsule or tablet encapsulating the extract according to any one of claims 1 to 5 or the dried extract according to claim 6 .
8 . A beverage obtainable by addition of the extract according to any one of claims 1 to 5 .
9 . A beverage containing 2,5-piperazinedione,3,6-bis(phenylmethyl)-,(3S,6S)— and having a pH of 5 to 10, wherein the ratio between the content of 2,5-piperazinedione,3,6-bis(phenylmethyl)-,(3S,6S)— (μg/100 g) and Brix (Bx) is 6 (μg/100 g)/Bx or more.
10 . The beverage according to claim 8 or 9 , which contains 2,5-piperazinedione,3,6-bis(phenylmethyl)-,(3S,6S)— in an amount of 60 μg/100 g or more.
11 . A packaged beverage, wherein the beverage according to any one of claims 8 to 10 is packed in a container.
12 . A process for producing the extract according to claim 1 , which comprises:
(1) a pretreatment step in which meat of livestock or poultry, fish meat or shellfish meat is used as a starting material and heated in a liquid to remove water-soluble proteins contained therein,
(2) a heating step in which the liquid is replaced after the pretreatment and heating is repeated again, and
(3) a filtration step in which the obtained liquid sample is filtered.
13 . A process for producing the extract according to claim 1 , which comprises:
(1) a pretreatment step in which meat of livestock or poultry, fish meat or shellfish meat is used as a starting material and heated in a liquid to remove water-soluble proteins contained therein,
(2) a heating step in which the liquid is replaced after the pretreatment and heating is repeated again,
(3) a filtration step in which the obtained liquid sample is filtered, and
(4) a concentration step.
14 . A process for producing the beverage according to claim 9 , which comprises:
(1) a pretreatment step in which meat of livestock or poultry, fish meat or shellfish meat is used as a starting material and heated in a liquid to remove water-soluble proteins contained therein,
(2) a heating step in which the liquid is replaced after the pretreatment and heating is repeated again, and
(3) a filtration step in which the obtained liquid sample is filtered.
15 . A process for producing the beverage according to claim 9 , which comprises:
(1) a pretreatment step in which meat of livestock or poultry, fish meat or shellfish meat is used as a starting material and heated in a liquid to remove water-soluble proteins contained therein,
(2) a heating step in which the liquid is replaced after the pretreatment and heating is repeated again,
(3) a filtration step in which the obtained liquid sample is filtered, and
(4) a concentration step.