Antioxidant capacity, total phenolics and nutritional content in selected Ethiopian staple food ingredients

Department of Post-Harvest Management, College of Agriculture and Veterinary Medicine, Jimma University , P.O. Box 307, Jimma , Ethiopia and.
International Journal of Food Sciences and Nutrition (Impact Factor: 1.21). 06/2013; 64(8). DOI: 10.3109/09637486.2013.806448
Source: PubMed


Abstract The total antioxidant capacity, total phenolics content (TPC) and nutritional content of five types of enset (Enset ventricosum) flour in comparison with four staples (teff [Eragrostis tef], wheat, corn and tapioca) were evaluated. Teff, corn and "amicho" (corm of enset) had the highest ferric reducing antioxidant power (FRAP). The FRAP and TPC of teff (1.8 mmol Trolox equivalence/100 g dry matter (DM) and 123.6 mg gallic acid equivalent/100 g DM, respectively) were over 4-fold larger than the lowest obtained from "bulla" (dehydrated juice of pseudostem of enset). Corn had the lowest IC50 value of 1,1-diphenyl-2-picrylhydrazyl radical scavenging (10.27 mg DM mL(-1)). Teff had the highest crude fat content (3.71%) and some mineral profile (P, Mg, Mn and Cu). Enset products had higher fiber, Ca, K, Mg and Mn content as compared to wheat and corn. Ethiopian staple teff has a potential for developing value-added food products with nutritional and health benefits.

Download full-text


Available from: H P Vasantha Rupasinghe, Jan 24, 2014
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The aim of this study was to analyze the influence of the drying process by combined methods. Osmotic dehydration was performed using glucose or sorbitol solutions at different concentrations (40 or 60 °Brix), temperatures (25 or 40C) and two fruit-to-syrup ratios (1:4 or 1:10). Hot air drying was performed at different temperatures (60, 70 or 80C). Dried plums were evaluated in terms of color, texture, rehydration ability, phenolic compounds (total phenols, flavonoids) and water activity. The color was analyzed through two methods: colorimeter and image analysis. The evaluations showed a decrease in luminosity and an increase of reddening due to browning originated during the drying process. The image analysis was the most appropriate to evaluate the changes in color. Firmness of plums increased in relation to fresh fruit and was more evident at higher drying temperature. High drying temperatures provoked a collapse of the plum structure, which hindered water absorption in the rehydration process. The phenolic compounds in plums were conditioned by the drying temperature; the content of phenols and flavonoids was higher when they were dried at 70C. Plums osmodehydrated in sorbitol 60% w/w, with a fruit/syrup ratio of 1/10, at 25C and air dried at 70C obtained a high degree of dehydration and best maintained quality attributes. Plums, natural or processed, can be considered as a functional food, since it provides nutrients and contains additional features that benefit the health of consumers. Hence, the importance to keep them with minimal changes to their nutritional value. The combined process by means of the osmotic dehydration and the hot air drying helps to preserve the desirable quality attributes of the fruit, as well as reduce the water content to obtain products stable against microbiological agents and reaction chemical. This information may help any industry of drying fruit to optimize the process conditions and reduce costs of processing and packaging.
    Journal of Food Processing and Preservation 06/2015; DOI:10.1111/jfpp.12515 · 1.16 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: There are more than 50000 known edible plants in the world, yet two-thirds of global plant-derived food is provided by only three major cereals - maize (Zea mays), wheat (Triticum aestivum) and rice (Oryza sativa). The dominance of this triad, now considered truly global food commodities, has led to a decline in the number of crop species contributing to global food supplies. Our dependence on only a few crop species limits our capability to deal with challenges posed by the adverse effects of climate change and the consequences of dietary imbalance. Emerging evidence suggests that climate change will cause shifts in crop production and yield loss due to more unpredictable and hostile weather patterns. One solution to this problem is through the wider use of underutilised (also called orphan or minor) crops to diversify agricultural systems and food sources. In addition to being highly nutritious, underutilised crops are resilient in natural and agricultural conditions, making them a suitable surrogate to the major crops. One such crop is teff [Eragrostis tef (Zucc.) Trotter], a warm-season annual cereal with the tiniest grain in the world. Native to Ethiopia and often the sustenance for local small farmers, teff thrives in both moisture-stressed and waterlogged soil conditions, making it a dependable staple within and beyond its current centre of origin. Today, teff is deemed a healthy wheat alternative in the West and is sought-after by health aficionados and those with coeliac disease or gluten sensitivity. The blooming market for healthy food is breathing new life into this underutilised crop, which has received relatively limited attention from mainstream research perhaps due to its 'orphan crop' status. This review presents the past, present and future of an ancient grain with a potential beyond its size.
    Biological Reviews 10/2015; DOI:10.1111/brv.12225 · 9.67 Impact Factor