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Influence of germination on bioactive properties, phytochemicals and mineral contents of Tigernut (Cyperus esculentus L.) tuber and oils

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Abstract

The increase in the oil yield of germinated (sprouted) tigernut tubers may be due to the decrease in protein, carbohydrate and mineral contents during the germination process. Antioxidant activity values of both sprouted and raw “Balyumru” tigernut tubers were found higher than those of results of sprouted and raw “Sarışeker” tigernut tubers. The phenolic compounds of tigernut tubers changed depending on variety and germination process. Generally, gallic (except raw “Balyumru”), 3,4-dihydroxybenzoic acid, (+)-catechin, 1,2-dihydroxybenzene, syringic acid, caffeic acid, rutin trhydrate, p-coumaric acid, trans-ferulic acid and apigenin-7-glucoside contents of raw “Sarışeker” and “Balyumru” tigernut tubers increased compared to sprouted tigernut tubers depending on germination process. The oleic acid amounts of sprouted and raw “Sarışeker” and “Balyumru” tigernut tuber oils were determined as 72.47% and 71.36–72.67 and 73.58%, respectively. Ca, K, Mg, Na and P were found at the highest levels in tigernut tubers.

Graphic Abstract

The oil and protein contents, fatty acid compositions, total phenol, antioxidant activity, phenolic compounds and the nutrients of raw and sprouted (germinated) “Sarışeker” and “Balyumru” tigernut tuber flours were investigated.

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Acknowledgements

The authors would like to extend their sincere appreciation to the Deanship of Scientific Research at King Saud University for its funding this Research Group No. (RG- 1439-016).

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Authors and Affiliations

  1. Department of Food Engineering, Faculty of Agriculture, Selcuk University, 42031, Konya, Turkey

    Mehmet Musa Özcan & Nurhan Uslu

  2. Department of Food Science and Nutrition, College of Food and Agricultural Sciences, King Saud University, Riyadh, Saudi Arabia

    Kashif Ghafoor, Fahad Al Juhaimi, Elfadil E. Babiker & Isam A. Mohamed Ahmed

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  1. Mehmet Musa Özcan
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  2. Kashif Ghafoor
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  3. Fahad Al Juhaimi
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Correspondence to Mehmet Musa Özcan or Kashif Ghafoor.

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Özcan, M.M., Ghafoor, K., Al Juhaimi, F. et al. Influence of germination on bioactive properties, phytochemicals and mineral contents of Tigernut (Cyperus esculentus L.) tuber and oils. Food Measure 15, 3580–3589 (2021). https://doi.org/10.1007/s11694-021-00929-3

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  • DOI: https://doi.org/10.1007/s11694-021-00929-3

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