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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.