Nutritional value of <i>Cyperus esculentus</i> L. (Neglected and Underutilized Crop Species): implication for valorization

Abstract The investigation of the nutritional value of Neglected and Underutilized Crop Species is essential for their valorization. This global systematic review aimed at investigating the nutritional value of tigernut to highlight the importance of the species in the fight against malnutrition. Extensive searches were carried out through three databases (ScienceDirect, Google Scholar, and African Journal Online) from March to April 2021, and studies were screened and extracted using the established systematic review methods. A total of 36 papers from Africa, America, Asia, and Europe met the inclusion criteria. Thematic synthesis was used to synthesize data, and findings were presented under three framework aspects (biochemical, mineral composition, and vitamin content). About 63.88% of the papers included in this global review were published from 2010 to 2020. The highest number of papers ( n  = 14) was recorded between 2015 and 2020, and most of the publications were from Europe ( n  = 13). The review showed that tigernut contained alkaloids, cyanogenic glycosides, resins, tannins, sterols, and saponins. It was very rich in potassium (K), followed by phosphorus (P), magnesium (Mg), calcium (Ca) sodium (Na), iron (Fe), zinc (Zn), copper (Cu), and vitamins A, B, C, D, and E. The review has also revealed that biochemical composition and vitamin content of tigernut depend on its geographical origin. Overall, the results highlighted the nutritional values of tigernut. Its valorization in foodstuffs could increase the profitability of this crop and contribute to the fight against malnutrition in Africa.