Figure 2.

Normalized (to the intensity at 1440 cm^-1) spectra of pure olive oil (black) and olive oil in the stabilized emulsion (blue) (A). Note the different ordinate axes for the fingerprint (1200–2000 cm^-1, left) and CH stretch (2800–3100 cm^-1, right) regions. Derived component representing the spectral differences caused by dilution of oils (B). Reconstruction (red line) of the experimental spectrum from the middle of the droplet (black line, normalized to 1440 cm^-1) using the TAG (violet fill), #C=C (red fill), #CH2 (grey fill), and dilution (green fill) components (C). Fitting residuals are plotted as red line in the upper panel in (C). Image of an olive oil emulsion droplet and computed maps for chain length and #C=C bonds (D) using the components from (C). Comparing chain length and #C=C values for small (n = 67) and big (n = 12) droplets, a tendency to read out longer chains can be found for the smallest droplets (E). There is no significant difference in the number of double bonds depending on droplet size. Values are displayed as mean ± SD. Significance was determined using an unpaired t-test with Welch’s correction, and p-values are classed as not significant is >0.05 and ^∗∗ < 0.01. To see this figure in color, go online.