Dependence of Sorghum bicolor antioxidant activity on harvest time

Abstract

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.

Comparative Study on Seed Characteristics, Antioxidant Activity, and Total Phenolic and Flavonoid Contents in Accessions of Sorghum bicolor (L.) Moench

“…Moreover, Jeon et al [ 81 ] observed variations in the phenolic compounds and antioxidant properties owing to differences in the harvesting time of sorghum genotypes. In another study, the irradiance period of the growing sorghum genotypes influenced the phenolic content and antioxidant activity of sorghum plants [ 82 , 83 , 84 ].…”

Tortilla chips made with white sorghum and corn: Comparison of sensory and physicochemical characteristics with corn‐made commercial products

“…Antioxidant activity in sorghum grains is related to the phenolic compound content, from which tannins, phenolic acids, and flavonoids are the main reasons for its capacity to scavenge oxidative radicals (Afiyi et al., 2012). Antioxidant activity is lower in white sorghum grains than in the dark testa varieties, and differences have been found between varieties with a similar color of testa at different harvest times(Jeon et al., 2017; Shen et al., 2018; Wu et al., 2017). Antioxidant activity values in white sorghum grains ranging from 340 to 500 µM TE /g have been reported but stress conditions during agronomic production can lead to a sharp increase doubling these values (Wu et al., 2017).…”

Pengaruh Perbedaan Waktu Panen Terhadap Karakteristik Kimia Biji Kecipir

“…Beberapa penelitian lain melaporkan hal yang serupa, perbedaan umur panen memengaruhi aktivitas antioksidan pada biji borage dan biji Aesculum hippocastanum (Mhamdi et al, 2010;Kedzierski et al, 2016). Jeon et al (2017) melaporkan aktivitas antioksidan pada biji sorghum mengalami penurunan mulai dari umur panen 25 hingga 55 hari. Penurunan aktivitas antioksidan pada sorghum ini berkolerasi dengan terjadinya penurunan kandungan total fenol, total flavonoid dan tanin pada biji sorgum.…”