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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2663

Title: LEVELS OF ESSENTIAL ELEMENTS IN THREE TEF ERAGROSTIS TEF(ZUCC.)TROTTER] VARIETIES.
Authors: Zeleke, Kebede
Advisors: Merid Tessema (Ph.D)
Keywords: Tef
Eragrostis tef, red tef
mixed tef
white tef
essential elements,
Flame Atomic Absorption spectrophotometer
Copyright: Jul-2009
Date Added: 6-May-2012
Publisher: AAU
Abstract: Tef, [Eragrostis tef(zucc.)Trotter] is an indigenous crop plant in Ethiopia. It provides the most staple food-Enjera for most Ethiopians. An efficient wet digestion procedure with the percentage recovery ranges from 85.66 to 105.22% (%R ± SD) was developed for tef flour sample using standard addition (spiking) method. The optimal digestion procedure allowed the use of acids with minimum volume leading to reduced blank contamination, and lower detection limit. The levels of nine essential elements (Na, K, Mg, Ca, Mn, Co, Cu, Zn &Fe) were determined by FAAS applying four point calibration curve in the three most common and commercially available tef types (Red, Mixed and White tef) collected from four mill houses in Arada sub city of Addis Ababa. The observed average metal concentration in red, mixed and white tef respectively are:Na(22.06 ± 1.46,25.68 ± 2.05,22.89 ± 1.42), K (215.81 ± 8.13, 219.23 ± 8.35, 205.59 ± 7.17), Mg (161.91 ± 7.76, 173.7 ± 8.89, 153.16 ± 9.45), Ca (178.54 ± 9.5, 168.64 ± 11.03, 180.7 ± 14.65), Mn (22.36 ± 0.15, 13.26 ± 0.029, 4.84 ± 0.044), Co (6.20 ± 5.38, 5.21 ± 0.29, 7.89 ± 0.75), Cu (2.51 ± 0.30, 3.79 ± 0.1, 1.08 ± 0.075), Zn (4.79 ± 10.7, 3.79 ± 0.1, 2.98 ± 0.12), and Fe (24.62 ± 1.07,20.05 ± 1.4, 15.95 ± 1.7) mg/100g of dry weight. A statistical analysis of variance (ANOVA) using excel and SPSS soft ware revealed that there is a significant difference between the mineral content of the three tef types at 95% ( p ≤ 0.05) CL. Tukey pair wise comparisons also confirmed this difference in mineral contents of the samples. Red tef has higher essential metal contents followed by mixed tef. Further more, all the three-tef types considered are rich in their mineral contents compared to maize, barely, sorghum, wheat, kocho and bulla, hence tef could be suitable sources of dietary minerals
URI: http://hdl.handle.net/123456789/2663
Appears in:Thesis - Chemistry

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