The invention discloses an antihypertensive peptide of a
swim bladder of a large yellow croaker and a preparation method and use thereof. The
amino acid sequence of the antihypertensive
peptide is Leu-Arg-Pro-Ile(SEQ ID No:1). The molecular weight detected through ESI-MS (
Electrospray Ionization Mass Spectrometry) is 497.65Da([M+H]+498.48Da). The preparation method comprises the following steps: washing the
swim bladder of the large yellow croaker by
distilled water, homogenizing by a high speed tissue stamp mill, extracting by a Na2HPO4-NaH2PO4 buffer liquid, and fractionally precipitating by
ammonium sulfate to obtain a coarse
protein; and sequentially carrying out enzymolysis on the coarse
protein by
trypsin and
alkaline protease, centrifugalizing, ultrafiltering and chromatographically refining the zymolyte to obtain the antihypertensive
peptide. The preparation process of the antihypertensive peptide disclosed by the invention is scientific and reasonable, the enzymolysis process by double enzymes is easy to control, and the prepared antihypertensive peptide has a remarkable inhibiting effect on the
angiotensin converting enzyme (ACE), has the advantages of easy digestive absorption, safety, no toxic and side effects and the like and can be used as a
medicine and a health-care food.