Fig. 3

Raman spectra (left) collected from different citrus varieties show distinctly different fruit biochemistry that can be used for citrus variety identification. Primarily differences were found in carotenoids region (1520–1523 cm⁻¹) and phenylpropanoid vibrations (1591–1627 cm⁻¹). Raman can be also used to determine change in fruit freshness (right) based on changes in vibrational bands of carotenoids. The caption and figure reproduced with permission from Nekvapil et al. [79]