Fig. 4.

Color attributes expressed as hue angle (a), chroma (b), and lightness (c) in yogurt pigmented with refined pitaya extract (Er), and microcapsules prepared with succinylated starch (S), phosphorylated starch (P), and N-Lok^® starch (N). Symbols correspond to experimental data and solid lines to adjustments by linear regression $(y=ax+b)$ in the case of Er or logarithmic regression $(y=y_0+a(1-e^{-bx}))$ in the case of S, P, and N. Different letters between parentheses mean significant difference (Tukey, 0.05). Legends ns and * indicate non-significant and significant modification with time. Error bars correspond to standard errors