title: Angiotensin I converting enzyme inhibitory peptides purified from bovine skin gelatin hydrolysate.
abstract: Bovine skin gelatin was hydrolyzed with sequential protease treatments in the order of Alcalase, Pronase E, and collagenase using a three-step ultrafiltration membrane reactor. The molecular weight distributions of the first, second, and third hydrolysates were 4.8-6.6, 3.4-6.6, and 0.9-1.9 kDa, respectively. The angiotensin I converting enzyme (ACE) inhibitory activity of the third hydrolysate (IC(50) = 0.689 mg/mL) was higher than that of the first and second hydrolysates. Two different peptides showing strong ACE inhibitory activity were isolated from the hydrolysate using consecutive chromatographic methods including gel filtration chromatography, ion-exchange chromatography, and reversed-phase high-performance liquid chromatography. The isolated peptides were composed of Gly-Pro-Leu and Gly-Pro-Val and showed IC(50) values of 2.55 and 4.67 microM, respectively.
authors: Department of Chemistry, Pukyong National University, Pusan 608-737, Korea. sknkim@mail.pknu.ac.kr
authors: S K
authors: SK
authors: Kim
authors: H G
authors: HG
authors: Byun
authors: P J
authors: PJ
authors: Park
authors: F
authors: F
authors: Shahidi
mesh_terms: D000806:Angiotensin-Converting Enzyme Inhibitors / Q000302:isolation & purification*; D000818:Animals; D002417:Cattle; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D010450:Endopeptidases; D005780:Gelatin; D020128:Inhibitory Concentration 50; D010455:Peptides / Q000302:isolation & purification*; D011492:Protein Hydrolysates / Q000032:analysis*; D012867:Skin / Q000737:chemistry*
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D010455:Peptides; D011492:Protein Hydrolysates; D005780:Gelatin; D010450:Endopeptidases