Total phenolic compounds detected by the Folin–Ciocalteu colorimetric method are presented in Table 3.
As the antioxidant capacity of WSE it can be observed that total phenolics (wGA) follow a similar trend. Results show that at 60 C and 100 C wGA remains constant for both temperatures over the whole extraction time period.
Also, at these temperatures, the highest amounts of wGA can be observed, being higher than 115 mg/g extract for the
samples obtained at 100 C and higher than 99 mg/g extract for the samples obtained at 60 C.
At 130 C the content of total phenolics similarly as ACW decreases with te for all M/S ratios, whereas at 160 C a decrease of wGA can be observed only until 60 min of extraction. Afterwards, an increase can be observed, which indicates, as mentioned earlier in Subsection 3.5, that other types of phenolics (antioxidants) could have been formed due to hydrothermal degradation.