Preparation of antihypertensive peptides from rice protein by enzymatic hydrolysis and its characteristics

Rice protein was hydrolyzed by alcalase for preparing antihypertensive peptides, and the end point of alcalase hydrolysis was DH 18.17%. Nine kinds of macroporous adsorbsed resins were utilized to adsorb antihypertensive peptides from rice protein. Results show that NKA resin has the best adsoption behavior, and the content of ash of antihypertensive peptides decreases from 16.64% to 2.32%. The relative molecular weight and solubility of antihypertensive peptides were analyzed, the result shows that the relative molecular weight of antihypertensive peptides mainly distributes from 138 to 1461, its solubility is about 97.6% with the pH value from 3 to 11.