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Anti-nutrient analysis of 30 Bambara groundnut (Vigna subterranea) accessions in South Africa
- Unigwe, Amara Evangeline, Doria, Enrico, Adebola, Patrick, Gerrano, Abe. S, Pillay, Michael
- Journal of crop improvement 2018 v.32 no.2 pp. 208-224
- Vigna subterranea, antinutritional factors, drought tolerance, food security, gallic acid, landraces, nutritive value, phosphates, phytic acid, proanthocyanidins, seeds, supply chain, trypsin inhibitors, South Africa, Western Africa
- Bambara groundnut is a leguminous crop that originated in West Africa. It is a drought-tolerant crop and has the potential to provide improved food and nutritional security in the dry areas of Africa. However, the plant contains anti-nutritional factors that affect its food value chain. The objective of this study was to assess the content of four major anti-nutritional factors in 30 bambara groundnut accessions in South Africa. The seeds of the bambara groundnut landraces were ground to make a fine powder and assessed for condensed tannins (CTs), phytic acid phosphate (PAP), polyphenol, and trypsin inhibitor content. Each assay was done in triplicate. The content of the four anti-nutritional compounds varied widely among the bambara groundnut accessions. The mean values for CTs ranged between 0.2 and 6.2 mg/g of prodephinidin equivalent, whereas that of the PAP was between 1.4 and 4.9 mg/g. A low mean polyphenol content of 0.4 mg/g of GA (gallic acid) equivalent was observed among the accessions. The level of trypsin inhibitor ranged from 5.3 to 73.4 TI/mg. With the exception of CTs and trypsin inhibitor, no significant correlation was observed among the four anti-nutritional factors assessed in this study. Generally, higher levels of anti-nutrients were observed in this study compared with certain studies reported earlier.