Effect of Watermelon Rind (Citrullus lanatus) Addition on the Chemical and Sensory Quality of Sorghum Based Mumu

Abstract

Aims: The aim was to evaluate the effect of watermelon rind addition on chemical and sensory properties of sorghum based mumu. Study Design: The experimental design used was the complete randomized design (CRD) and the Data obtained was subjected to Analysis of Variance (ANOVA) followed by Tukey’s Least Significant Difference(LSD) test to compare treatment means; differences was considered significant at 95% (P≤0.05) (SPSS Version 21 software). Place and Duration of Study: Department of Chemistry, Benue State University, Makurdi, Benue State, Nigeria, between June 2018 and March 2019. Methodology: Sorghum-based mumu was prepared from composite flours of 85:15, 75:15, 70:15 and 65:15% roasted sorghum flour and roasted partially defatted groundnut flour respectively and included with 0, 10, 15 and 20% watermelon rind powder respectively which were known as sample A, B, C and D accordingly and sample A was used as control. Subsequently, proximate composition, selected minerals and vitamins were determined using standard methods. Sensory evaluation was also conducted. Results: The addition of watermelon rind powder to sorghum-based mumu showed a significantly higher (P < 0.05) on the protein, ash and fibre. Their values ranged from  13.67 to 15.97%, 1.99 to 3.17% and 1.33 to 1.67% respectively, while moisture, crude fat and carbohydrate decrease with values ranged from 12.35 to 10.70%, 2.07 to 1.94% and 68.59 to 66.55% respectively. The energy values ranged from 347 to 348.76 Kcal/100 g). The results obtained from different minerals tested ranged as follows for phosphorus (124.10 to 155.67mg/100g), for magnesium (1.36 to 2.90 mg/100 g), for calcium (12.28 to26.67 mg/100 g) and for potassium (59.29 to 72.79 mg/100 g). Vitamins ranged from A (14.93 to 15.25 ug/100 g), C (5.97 to 8.12mg/100g), B1 (0.43 to 0.54mg/100g) and B2 (0.01 to 0.13 mg/100 g). Sensory evaluation results showed that the acceptability of the samples decreased significantly (P < 0.05) with increased level of watermelon rind powder. Conclusion: The sorghum -based mumu supplemented with watermelon powder at 10% and 15% should be adopted since their sensory scores were high and the nutrient content significantly increased.