Multiple extraction
The C. asiatica herbal tea leaves from the first extraction step were
re-steeped for a second and third time to investigate the effect of
multiple extractions upon TPC and FRAP values (Fig. 2). The TPC
and FRAP values of C. asiatica infusions decreased tremendously
after the first extraction. However, the TPC values in the second
and third extractions of CANF and CAPF were not significantly
different, and there was no significant difference among the FRAP
values of CANF, CAPF and CAFF. These results were in contrast
with those ofHorzic et al.23 who reported that herbal infusions had
the lowest TPC value after the third extraction and were almost
negligible.