Proximate composition of cake samples
From Table 10, the moisture content of all the treated samples was lower than that of control without any significant differences between them. The watermelon rind and sharlyn melon peel powders were significantly affected the fat and ash content of cakes. However, the fat content of cake significantly decreased whereas the ash content showed a significant increasing as the level of substitution increased compared to the control. Concerning the protein content all the samples, it was not affected and had practically the same values. While the total carbohydrates were significantly increased in substituted cake compared to the control without any differences among the treatments.