Fig. 1.

The UV–VIS spectral profiles of Acer pseudoplatanus, Aesculus hippocastanum, Fagus sylvatica, Ribes nigrum, Rosa canina, Salix caprea, Tilia tomentosa, Vitis vinifera spp. diluted with three different solvents: water, water:ethanol 60:40, and ethanol, respectively (codified in the final letter of the sample name as “A”, “M” and “E” 129 respectively) at different phenological stages (blue adult stage; green embryonic stage). Concerning embryonic stage both the quiescent buds and the young sprouts, when present, were taken into account besides the buds. Concerning adult stage only for Vitis vinifera spp. two different adult parts of the plant have been taken into account: leaves (blue line) and stalks (blue dotted line) respectively. In the lower right corner there is the corresponding first-order derivative spectrum for the Tilia tomentosa spp (color figure online)