Assessment of the co-extraction of substances other than caffeine
is also important since these substances may affect the
sensorial quality and/or bioactivity functions of green tea. In this
respect, the content of catechins was determined by HPLC in the
whole extract of the static assays, and resulted in values of 0.2,
0.8 and 6.7 mg catechins/g tea, respectively, for EA, EL and ETOH
cosolvents. The caffeine/catechins selectivity can be pondered considering the ratio caffeine/catechins extracted per g of green tea
leaves, which resulted 33 for EA, 16.3 for EL and 1.6 for ETOH. The
cosolvent polarity is influencing the co-extraction of catechins and
thus the caffeine/catechins selectivity