Principal component analysis (PCA) was used to understand the relationships between the sensory attributes of ugali and the type of flour used in their preparation, and to relate instrumental textural properties of the sorghum foods to the human perception
of sensory qualities of ugali. With respect to the first objective, Factor 1 (accounting for 47% of the variation in the sensory attributes), separated ugali samples in terms of the sorghum cultivar used in their preparation, whereas Factor 2 (representing 30% of the variation) separated the samples based on presence or absence of cowpea in the ugali (Fig. 2a). Concerning the second objective, results from instrumental analysis of ugali texture (firmness and stickiness) and the scores for these textural attributes by the descriptive sensory panel were positively correlated as shown by the PCA plot (Fig. 2b) and Table 5.