| 摘要 |
PROBLEM TO BE SOLVED: To obtain water for a food and drink containing a protein of good quality derived from a natural substance, capable of expecting health maintaining, nutrient supplementing and beauty culture effects, etc., and good in quality stability by including sericin or a sericin hydrolyzate. SOLUTION: A sericin powder is obtained by treating a cocoon of a domesticated silkworm removed from a chrysalis in distilled water at 80 deg.C for 1 h, eluting sericin, then concentrating the resultant eluate under a reduced pressure, removing a flocculant by filtration, adding ethanol thereto, separating the deposited substance by filtration, drying the separated substance and providing the sericin powder. Furthermore, a sericin hydrolyzate powder is prepared by treating the cocoon of the domeasticated silkworm after removing the chrysalis with an aqueous sodium hydrogencarbonate at 0.1 mol/L concentration at 80 deg.C for 1 h, eluting a sericin hydrolyzate and affording the sericin hydrolyzate powder in the same manner as that described above. This water for a food and drink is obtained by adding the resultant sericin powder and/or sericin hydrolyzate powder to a commercially available mineral water, heating the resultant mixture at 100 deg.C, completely dissolving the sericin powder and/or sericin hydrolyzate therein while carrying out the sterilization, adding the mineral water and filtering the obtained mixture. |
