When regarding the stability of FFA in SubCW, the study
reported by Shin, Ryu, Park, & Bae (2012) claims that FFA are stable
in SubCW at temperatures below 300 C, i.e. no products of
hydrothermal degradation are formed below this temperature. We
can therefore safely assume that the quality of the oil was preserved
and the triglycerides were not hydrolysed.