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Antioxidant and Antihypertensive Activities of Grains Grown in South Korea in Relation to Phenolic Compound and Amino Acid Contents

  • Narae Han (Dept. of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration) ;
  • Koan Sik Woo (Bioenergy Crop Research Institute, National Institute of Crop Science, Rural Development Administration) ;
  • Jin Young Lee (Dept. of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration) ;
  • Jiho Chu (Dept. of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration) ;
  • Mihyang Kim (Dept. of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration) ;
  • Yu-Young Lee (Dept. of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration) ;
  • Moon Seok Kang (Dept. of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration) ;
  • Hyun-Joo Kim (Dept. of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration)
  • Received : 2023.11.22
  • Accepted : 2023.12.08
  • Published : 2023.12.31

Abstract

Hypertension is characterized by excessive renin-angiotensin system activity, leading to blood vessel constriction. Several synthetic compounds have been developed to inhibit renin and angiotensin-converting enzyme (ACE). These drugs often have adverse side effects, driving the exploration of plant protein-derived peptides as alternative or supplementary treatments. This study assessed the phenolic compound and amino acid content and the antioxidant and antihypertensive activity of 5 South Korean staple crops. Sorghum had the highest phenolic compound content and exhibited the highest antioxidant activity. Millet grains, particularly finger millet (38.86%), showed higher antihypertensive activity than red beans (14.42%) and sorghum (17.16%). Finger millet was found to contain a large proportion of branched-chain, aromatic, and sulfur-containing amino acids, which are associated with ACE inhibition. In particular, cysteine content was positively correlated with ACE inhibition in the crops tested (r=0.696, p<0.01). This study confirmed that the amino acid composition was more correlated with the antihypertensive activity of grains than the phenolic compound content. Finger millet mainly contained amino acids, which have higher ACE inhibitory activity, resulting in the strongest antihypertensive activity. These findings underscore the antihypertensive potential of select crops as plant-based food ingredients, offering insight into their biological functions.

Keywords

Acknowledgement

This research was funded by the Cooperative Research Program for Agriculture Science and Technology Development (RS-2019-RD007816) of the Rural Development Administration, Korea and the 2023 RDA Fellowship Program of the Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration, Republic of Korea.

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