Journal
CEREAL RESEARCH COMMUNICATIONS
Volume 49, Issue 3, Pages 343-353Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s42976-020-00118-w
Keywords
Antioxidant activity; Bioactive compounds; Correlation; Flavanoids; HPLC; Phenolic compounds; Sorghum; Tannin
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Funding
- Department of Science & Technology, SERB under the Prime Minister's Fellowship Scheme for Doctoral Research
- Department of Science & Technology, CII under the Prime Minister's Fellowship Scheme for Doctoral Research
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Polyphenolic compounds in sorghum were characterized and quantified in five genotypes, showing that red and brown pericarp genotypes had higher antioxidant activities due to higher total proanthocyanidin and total phenolic content. Antioxidant activity was linearly related to polyphenols, suggesting potential for improving nutritional value and health properties in human food.
Among cereals, sorghum, a gluten-free cereal is a rich source of bioactive polyphenols and dietary antioxidants. Sorghum polyphenolic compounds were characterized and quantified in five sorghum genotypes by high performance liquid chromatography. Grain samples of five sorghum genotypes were grounded and subjected top extraction for profile of polyphenols via High Performance Liquid Chromotography. Results showed that red and brown pericarp genotypes had higher total proanthocyanidin and total phenolic content, therefore, resulting in overall high antioxidant activities. The phenolic acids that showed the higher antioxidant activity in red (SSG 59-3) and brown (G-46) genotypes were caffeic acid, taxifolin and apigeninidin. SSG 59-3 (20.55 +/- 0.11(a), 45.66 +/- 0.23(b), 15.34 +/- 0.10(C)) had higher antioxidant activity evaluated by DPPH, ABTS and FRAP assay. The concentrations of the sorghum-specific 3-deoxyanthocyanidins luteolinidin and apigeninidin were higher in red sorghum. Correlation analysis showed that antioxidant activity had a linear relationship with their polyphenols. Thus, our findings indicated that there is cumulative effect of both high antioxidant activity and phenolic compounds which may be exploited for human food to improve the nutritional value and health properties.
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