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Research articles

ScienceAsia 43 (2017): 155-162 |doi: 10.2306/scienceasia1513-1874.2017.43.155

Dependence of Sorghum bicolor antioxidant activity on harvest time

Seung-Ho Jeona, Il-Suk Kimb, Soo-Kwon Parkc, Ki-Youl Jungc, Sam Woong Kimb, Young-Son Choa,*

ABSTRACT:     This study was done to examine the correlation between differential contents of antioxidants and their antioxidative activities in the seeds obtained from two sorghum cultivars (Nampungchal and Hwanggeumchal) according to harvest time post heading, and to understand the properties of the harvested seeds. The seeds were harvested every 5 days from 25–55 days post heading. Length, width, thickness, and morphological properties of the obtained seeds were increased in proportion to the harvest time. The weights per thousand grains, crude fat, and redness (a*) clearly changed depending on the harvest time. The grain weight and fat content showed the highest value at harvest time days 45 (HT 45). The seed coat lightness (L*), crude protein, total polyphenol, flavonoid, and tannin in both cultivars were inversely proportional to the harvest time. In addition, ABTS and DPPH radical scavenging activities were also reduced in inverse proportion to the elapsed harvest time. Antioxidants including polyphenol, flavonoid, and tannin showed positive correlations with the antioxidative activities such as ABTS and DPPH activities, but antioxidants and their activities had no significant correlations between cultivars. We therefore propose that sorghum harvest is performed earlier to improve its antioxidative function.

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a Department of Agronomy & Medicinal Plant Resources, Gyeongnam National University of Science and Technology, Jinju 52725, South Korea
b Swine Science and Technology Centre, Gyeongnam National University of Science & Technology, Jinju 52725, South Korea
c National Institute of Crop Science, Rural Development Administration, Wanju 55365, South Korea

* Corresponding author, E-mail: yscho@gntech.ac.kr

Received 22 Jun 2017, Accepted 28 Jul 2017