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Nutrient and antinutrient composition of improved sweet potato [Ipomea batatas (L) Lam] varieties grown in eastern Ethiopia

Demelash Hailu Mitiku (Department of Food Technology and Process Engineering, Wollega University, Shambu, Ethiopia)
Tilahun Abera Teka (Department of Postharvest Management, Jimma University, Jimma, Ethiopia and Center for Food Science and Nutrition, Addis Ababa University, Addis Ababa, Ethiopia)

Nutrition & Food Science

ISSN: 0034-6659

Article publication date: 8 May 2017

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Abstract

Purpose

The purpose of this study was to compare the nutrient and antinutrient content of two improved sweet potato varieties released for drought prone areas of eastern Ethiopia.

Design/methodology/approach

Matured roots of two sweet potato varieties, namely, Berkume and Adu, were collected from Haramaya University, Toni Research Farm, Ethiopia. The sweet potatoes were ground into flour following standard procedure. Thereafter, proximate, dietary minerals and β-carotene were determined by official methods of analysis. The tannin and phytate contents were determined by colorimetric methods.

Findings

The moisture, protein, fat, fiber, ash, utilizable carbohydrate and gross energy varied from 6.23-6.61 per cent, 2.07-2.76 per cent, 1.25-1.52 per cent, 1.04-1.16 per cent, 3.38- 5.32 per cent, 90.03-91.45 per cent and 382.18-388.07 Kcal/100 g in both the sweet potato varieties. Potassium content (176.17 mg/100 g) was reported to be the highest and registered in Berkume variety, while the lowest mineral content (2.18 mg/100 g) determined was zinc in Adu sweet potato variety. The highest total carotenoid content (3.39mg/100 g) was recorded in Berkume sweet potato variety. The tannin and phytic acid contents ranged from 9.98 to 12.94 mg/100 g and from 0.24 to 0.31 mg/100 g in Berkume and Adu sweet potato varieties, respectively.

Originality/value

This study showed that the Berkume sweet potato variety has high nutritional potential and less antinutrient contents as compared with the nutritional value of many other roots and tuber crops documented in the FAO database and hence can contribute to reducing malnutrition in resource-poor settings of Ethiopia. Further work needs to be carried out on developing value-added products from Berkume sweet potato variety for its extensive utilization.

Keywords

Citation

Mitiku, D.H. and Teka, T.A. (2017), "Nutrient and antinutrient composition of improved sweet potato [Ipomea batatas (L) Lam] varieties grown in eastern Ethiopia", Nutrition & Food Science, Vol. 47 No. 3, pp. 369-380. https://doi.org/10.1108/NFS-07-2016-0098

Publisher

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Emerald Publishing Limited

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