Analysis of Selenium Content in Root and Tuber Plants in Central Nigeria

Saidu Zarmai, Ishaq S. Eneji, Rufus Sha’Ato

Department of Chemistry, Centre for Agrochemical Technology, University of Agriculture, Makurdi, Nigeria.

DOI: 10.4236/ajac.2013.412089                

Abstract

Some common staple roots and tubers (cassava, yam, sweet potato and yellow yam) were analyzed for selenium content level using hydride generation—atomic absorption spectrophotometry (HG-ASS) technique. Results for duplicate analysis revealed that sweet potato has the highest mean selenium content (19.2 ± 5.20 μg/kg), followed by yellow yam (18.3 ± 6.97 μg/kg), then yam (13.6 ± 7.12 μg/kg) and cassava the least (13.0 ± 5.84 μg/kg). In comparing our results with the literature values, most of the results obtained in this work such as <1.00, 1.09, 1.91, 2.35 and 11.0 μg/kg were lower while a few others like 52.6, 54.2, 72.3 and 81.8 μg/kg were higher than literature values. The variations could be due to the type of species/variety, geographical location, total selenium concentration in the soil and its bioavailability. In view of the importance of Se to human health and considering the levels found in the staples investigated, we recommend that sweet potato be popularized as a staple, much more than cassava as it is now the case in Central Nigeria.

Keywords

Selenium; Content; Roots and Tubers; Central Nigeria; HG-AAS

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	V. N. Gladyshev, D. E. Kryukov, G. V. Fomenko and D. L. Hatfield, “Identification of Trace Element—Containing Proteins in Genomic Data Base,” Animals Review Nutrition, Vol. 24, 2004, pp. 579-596.
[2]	Y. Chen, M. Hall, J. H. Graziano, V. Skvkovich, A. Van Green, F. Parvez and H. Ahsan, “A Prospective Study of Blood Selenium Levels and the Risk of Arsenic Related Premalignant Skin Lessions,” Cancer Epidemiology Biomarkers and Prevention, Vol. 16, 2007, pp. 207-213. http://dx.doi.org/10.1158/1055-9965.EPI-06-0581
[3]	Institute of Medicine, Food and Nutrition Board (IMFNB), “Dietary Reference Intake for Vitamin C, Vitamin E, Selenium and Carotenoids,” National Academic Press, Washington DC, 2000.
[4]	G. F. Combs, “Selenium in Global Food Systems,” British Journal of Nutrition, Vol. 85, No. 5, 2001, pp. 517-547. http://dx.doi.org/10.1079/BJN2000280
[5]	“US National Library of Medicine (USNLM) and National Institutes of Health (NIH),” Medline Plus, 2009, pp. 3-10.
[6]	O. A. Levander, “The Global Selenium Agenda,” In: L. S. Huley, C. L. Keen, B. Lonnerdal and R. B. Rucker, Eds., Trace Elements in Man and Animals 6, Proceedings of the 6th International Symposium on Trace Elements in Man and Animals, Plenium Press Inc., New York, 2005, pp. 20-26.
[7]	L. Wu, “Selenium Accumulation and Uptake by Crop and Grassland Plant Species,” In: W. Franken Berger and R. Engberg, Eds., Environmental Chemistry of Selenium, Marcel Dekker, New York, 1998, pp. 657-686.
[8]	K. S. Dhillon and S. K. Dhillon, “Distribution and Management of Seleniferous Soils,” Advances in Agronomy, Vol. 79, 2003, pp. 119-185. http://dx.doi.org/10.1016/S0065-2113(02)79003-2
[9]	National Institute of Health (NIH), NIT Clinical Centre, Office of Dietary Supplements, “Use the Build in Search Function to Find Specific,” 2009, pp. 6-10.
[10]	Food and Agricultural Organization (FAO), “Prostart,” FAOSTAT, 2006, pp. 12-26.
[11]	National Academy of Science (NAS), “Dietary Reference Intakes for Vitamin C, Vitamin E, Selenium and Carotenoids,” Washington DC, 2000, pp. 63-65.
[12]	USEPA, “Recommendation on Maximum Intake Level of Selenium,” In: Selenium Paper Prepared for Consideration by Export Group on Vitamins and Minerals, EVM/ 99/171, 1994.
[13]	WHO/FAO/IAEA, “Trace Elements in Human Nutrition and Health,” World Health Organization, Geneva, 1996, pp. 6-10.
[14]	F. O. Abulude, M. O. Ogunkoya and T. A. Oroko, “Selenium in Nigeria Foods,” Federal College of Agriculture. Akure, 2006, pp. 1-8.
[15]	M. Rayman, “The Importance of Selenium to Human Health,” The Lancet, Vol. 356, No. 9225, 2008, pp. 233-241. http://dx.doi.org/10.1016/S0140-6736(00)02490-9
[16]	Food Standard Australia New Zealand (FSANZ), “Metals and Other Substance Selenium,” Total Diet Survey, Part B, 2002.
[17]	Nordic Group, “Risk Evaluation of Essential Trace Elements. Essential versus Toxic Levels of Intake,” Nordic Council of Ministers, Nord, 1995.