Extracts and beverages containing 2,5-piperazinedione,3,6-bis(phenylmethyl)-, (3s,6s)-

Abstract

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.