The HMP, LMP and control sample (CTL) formulations showed higher traces of the green pigment (-a*) and yellowness (-b*). However, the lowest green trace was observed with the addition of guar, and the lowest yellow trace was observed for samples with carrageenan, xanthan and UF added. Lower values were found by Amin et al. (2014) both for a* (−1.38 to −1.71) and b* (8.1–11.17). Therefore, it is clear that the hydrocolloid added can affect the mayonnaise color, which can be attributed to the particular characteristics of each additive.
3.2.3. Assessment of thickening power in passion fruit syrup
In Table 3, the thickening power (viscosity) and water activity in passion fruit syrup for ice cream of the hydrocolloids under study can be observed. The syrup with the highest viscosity was that containing xanthan gum, followed by TF, guar and UF. This indicates that the potential of these flours as a thickening agent is significant, since they led to passion fruit syrup samples with higher viscosity when compared to other traditional commercial thickeners for this product, such as HMP and LMP pectins and carrageenan.