Assessment of Microbial Changes and Nutritional Qualities of Extruded White Yam (Dioscorea rotundata) and Bambara Groundnut (Vigna subterranean) Blends

Oluwole, O.B. and Awonorin, S.O. and Henshaw, F. and Elemo, G.N. and Ebuehi , O.A.T. (2013) Assessment of Microbial Changes and Nutritional Qualities of Extruded White Yam (Dioscorea rotundata) and Bambara Groundnut (Vigna subterranean) Blends. Food and Nutrition Sciences, 4 (1). pp. 100-107.

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Abstract

Two flavoured extruded products were developed by co-extruding yam grits (750 μm) obtained from white yam (Dioscorea rotundata) and bambara groundnut flour (250 μm) in 160:40 respectively obtained from white bambara groundnut with added flavouring agents of salt (1% - 3%) and sugar (4% - 6%) in the feed blends at screw speed of 70 rpm, 17.5%, feed moisture and at the barrel temperature of 145°C. The extruded products were packaged in low density polyethylene bag (0.02 μm gauge size) and stored at room temperature (28°C ± 2°C) and at refrigeration temperature (9°C ± 2°C) for a period of twenty weeks. The microbiological changes in the extruded products as determined by the total plate under both storage conditions showed that maximum total plate counts were 0.5 × 104 and 5.4 × 104 cfu/g at 9°C ± 2°C and 28°C ± 2°C respectively. Nutritional evaluation studies of extrudates were comparable (p ≥ 0.05) with standard casein diet with minimum crude protein content of 13.51% providing 1707.2 KJ energy per 100g of diet and supported weight gain and growth of laboratory animals.

Item Type: Article
Uncontrolled Keywords: Co-Extrude; Yam Grits; Bambara Flour; Total Plate Count; Nutritional Evaluation; Weight Gain; Growth
Author Affiliation: Food and Analytical Services Department, Federal Institute of Industrial Research, Oshodi, Nigeria
Subjects: Plant Protection
Soil Science and Microbiology > Microbiology
Crop Improvement
Divisions: Groundnut
Depositing User: Mr B Krishnamurthy
Date Deposited: 25 Jun 2013 13:45
Last Modified: 25 Jun 2013 13:45
Official URL: http://dx.doi.org/10.4236/fns.2013.41014
URI: http://eprints.icrisat.ac.in/id/eprint/10767

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