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Isolation of Angiotensin I-Converting Enzyme Inhibitory Peptide from Chungkookjang  

Matsui Toshiro (Bioscience and Biotechnology, Graduate School of Agriculture, Kyushu University)
Yoo Hyung Jae (Department of Life Science, Hoseo University)
Hwang Jae Sung (Department of Life Science, Hoseo University)
Lee Dong Seok (Department of Medical Laboratory Science, Inje University)
Kim Han Bok (Department of Life Science, Hoseo University)
Publication Information
Korean Journal of Microbiology / v.40, no.4, 2004 , pp. 355-358 More about this Journal
Abstract
Chunkookjang, Korean traditional fermented soybean food emerges as a functional food to improve intestinal function and blood circulation. During Chungkookjang fermentation, microorganisms, enzymes, and diverse bioactive compounds increase sharply. Chungkookjang contains diverse oligo-peptides. Formation of peptides was confirmed by SDS-PAGE. Solube fermented soybean in our sample contained Tyr, Gln-Lys, Trp, Gln, and Lys-Pro as major components. Lys-Pro (0.083 mg/100 g sample) was purified by HPLC analysis. Angiotensin I­converting enzyme (ACE) causes hypertension by converting angiotensin I to angiotension II. ACE inhibitory activity of Lys-Pro was determined to be $IC_{50}=32.1\;{\mu}M.$ Whether or not eating Chungkookjang can lower blood pressure was also determined. Sistolic blood pressure dropped by 15 mmHg, and diastolic blood pressure by 8 mmHg 2 hr after a single administration of 20 g of fermented soybean. Chungkookjang might be helpful in improving blood circulation since it has ACE inhibitor and antihypertenisve effect.
Keywords
angiotensin I-converting enzyme; blood pressure; Chungkookjang; peptide; HPLC;
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