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FES to Evaluate Food Quality
FIGURE 15.4 R40yellow/blue of whole apples and their seeds at different maturation stages. Whiskers
indicate standard error of the mean. An increasing divergence of the induced emission of whole apples and
their kernels during maturation was observed, these being indicated on the fgure by the crossing of the lines.
metabolites) and increased differentiating processes (diversity of tissue structure and integration of
small molecules into larger ones relating to secondary metabolites).
Another experiment with factors including light intensity and biodynamic preparations
(Figure 15.5) showed that at full light and with biodynamic preparations, an emission with high
yellow-by-blue ratios was observed, indicating that under these growing conditions, a fruit developed which was comparable to mature fruits, while shadow resulted in apples which looked as
though they were not completely ripened.
Yellow/blue is the most obvious of the colour parameters in terms of excitation and can be
found in several other sample sets as relevant to maturation and ripening of seeds. (Single colours
are less specifc to maturation, and these absolute parameters are more intensively related to, for
example, the size of the sample or freshness.) The challenge of this method is that the parameter
FIGURE 15.5 R40yellow/blue of whole apples from different growing conditions (light intensity and application of biodynamic preparations).