This is illustrated in Fig. 2,
showing differences in the raw milk spectra with the
addition of tea extract, especially with EGCG. The
measurement of the fluorescence of EC and EGCG in
distilled water exhibits no intrinsic fluorescence peaks (Ex
360 nm, Em 380–600 nm). This indicates that the immediate
fluorescence profile changes in the milk system are the
result of interaction(s) with milk components. The average
difference in Table 1 shows that both EC and EGCG
reduced the development of fluorescence during heat
processing, and for both extracts the higher concentration
level had a greater effect.