Effects of waxing materials and storage periods on physico-chemical properties of trifoliate yam (Dioscorea dumetorum)
Journal Title: Applied Science Reports - Year 2013, Vol 4, Issue 2
Abstract
The effect of different waxing materials (bee wax, palm wax and paraffin wax) and storage period (0, 2, 4, 6, 8 weeks) on some physico-chemical parameters of Dioscorea dumetorum tubers was assessed. Harvested tubers of the yellow variety of D. dumetorum were grouped into four. Three of these were differently treated with bee wax, palm wax and paraffin wax while the fourth group was not treated (control sample). The four samples were then stored under the same condition (26.5+ 4.0oC and RH of 55.2+15.5%) for 8 weeks. Tubers were evaluated bi-weekly for their chemical and functional properties using the recommended standard methods. Weight loss varied with storage time and waxing material; tubers waxed with palm wax had the least weight loss (9.09%) while the un-waxed tubers had the highest weight loss (26.67%) at the end of the 8 weeks storage. Chemical analysis showed that moisture content, starch yield and crude protein content significantly (p<0.05) reduced with increase in storage period while the dry matter, fat, crude fibre and ash contents increased with storage period. Functional properties such as water and oil absorption capacity as well as swelling index also varied with both storage period and waxing material. The water and oil absorption capacities decreased significantly with storage period. All the waxing materials retained the nutrient contents more than the un-waxed tubers however, palm wax performed better than the other waxing materials in terms of weight after storage, nutrient and functional properties after storage.
Authors and Affiliations
V. C Ezeocha, E Oti
Keywords
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