The Amadumbe crop [Colocasia esculenta (L.) Schott] is a traditional Southern African tuber
crop which is rich in starch, mucilage and micronutrients. Amadumbe tubers have limited
amount of proteins and as a result, amadumbe-processed foods lack adequate protein. The
purpose of this study was therefore to develop protein-rich amadumbe-soya composite biscuits,
which would be acceptable to consumers. Biscuits were prepared by combining amadumbe and
soya flours at ratios: 90:10, 70:30 and 50:50. Functional properties of composite flours and the
physical properties of composite biscuits were determined. The proximate composition, amino
acid composition and protein digestibility of composite biscuits were determined. Consumer
acceptability test of biscuits was performed using nine-point hedonic scale. The results
indicated that the 90% amadumbe and 10% soya composite biscuits had high significant values
of moisture, ash, carbohydrates contents and energy values. The 50% amadumbe and 50% soya
composite biscuits had significantly high values of fat, crude protein contents and acid
detergent fibre (ADF). The protein digestibility, amino acid contents, especially the lysine
contents of composite biscuits increased significantly (p ≤ 0.05) with an increase in the
percentage of soya. The mineral contents of composite biscuits; Ca, Mg, P, Zn, Cu, Mn and Fe
increased significantly (p ≤ 0.05) with the increase of soya in the composite biscuits. There was
a significant difference in the mean taste acceptability and mean overall acceptability when the
soya concentration was increased to 50%. Soya was successfully used to produce amadumbe
composite biscuits with better nutritional quality with respect to protein content, amino acid
profile and selected mineral contents and which were acceptable to consumers. / National Research Foundation (South Africa) / Life and Consumer Science / M.Sc. (Agriculture)
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:unisa/oai:uir.unisa.ac.za:10500/25106 |
| Date | 06 1900 |
| Creators | Mokhele, Tabea Mokgalakane |
| Contributors | Tabit, F.T., Amonsou, E.O. |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Dissertation |
| Format | 1 online resource (xi, 74 leaves) : illustrations (color) |
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