Adedayo, Bukola C., Anyasi, Tonna ORCID: 0000-0002-2242-3501, Taylor, Malcolm J. C., Rautenbauch, Fanie, Le Roes-Hill, Marilize ORCID: 0000-0002-1930-2637 and Jideani, Victoria A. ORCID: 0000-0002-4550-6334 (2021) Phytochemical composition and antioxidant properties of methanolic extracts of whole and dehulled bambara groundnut (Vigna subterranea) seeds. Scientific Reports, 11 (1):14116. pp. 1-11. ISSN 2045-2322 (Online) (doi:https://doi.org/10.1038/s41598-021-93525-w)

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Abstract

The distribution of phytochemicals and their contribution to antioxidant potentials in whole and dehulled Bambara groundnut (BGN) seeds was evaluated. Whole BGN seeds were sorted using the testa and hilium colour and further grouped into whole and dehulled BGN seeds. Extractions of both whole and dehulled BGN seeds was done using methanol and the extracts assayed for total phenolics (TPC), flavanol, flavonol, anthocyanin content, oxygen radical absorbance capacity (ORAC) and ferric reducing antioxidant power (FRAP). Methanolic extract of whole BGN seed exhibited higher flavanol and flavonol content as well as significantly higher in-vitro antioxidant activities than dehulled BGN seeds. The TPC of whole BGN seed extract ranged from 3.6 to 11.0 GAE/g, while that of dehulled BGN ranged from 2.7 to 3.2 GAE/g. Identification of phenolics in whole and dehulled BGN seed extract using UPLC-qTOF-MS, revealed the presence of monoterpenoids (iridoids), phenolic acids, flavonoids and lignans. Bivariate correlations showed anthocyanin demonstrated weak positive correlation between flavanol, flavonol and ORAC for whole BGN seed extract; and negative correlation between flavanol, TPC, FRAP and ORAC for dehulled BGN. Aside the effect of dehulling, whole BGN seeds exhibited the presence of phytochemicals with beneficial properties for food and industrial application.

Item Type:	Article
Uncontrolled Keywords:	bambara groundnut; dehulling; whole seed; antioxidant activities; flavonoids; phenolics
Subjects:	Q Science > QD Chemistry R Medicine > RV Botanic, Thomsonian, and eclectic medicine S Agriculture > S Agriculture (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Natural Resources Institute Faculty of Engineering & Science > Natural Resources Institute > Food & Markets Department
Last Modified:	12 May 2023 11:04
URI:	http://gala.gre.ac.uk/id/eprint/42552

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