Even though UAE extraction does not improve extraction yields, an increase in temperature (>160 °C) yields higher extraction efficacy which increases the antioxidant activity. As lignin is a tough fraction of the LCB, often intertwined with the cellulose fraction, it is often extracted in the later stages of the fractionation process. A standard way to recover lignin is its extraction in basic conditions followed by a reacidification to force its precipitation.