A shift in the difference between the standards and the investigated samples can be explained by the method of extraction of the main polyphenols. The obtained spectra were similar, therefore we present only 4 spectra and their comparison with catechin.
Ashift in the difference between the standards and the investigatedsamples can be explained by the method of extraction of the mainpolyphenols. The obtained spectra were similar, therefore we presentonly 4 spectra and their comparison with catechin.