When looking at the ACW of the water soluble extracts (Table 2)
it can be observed that compared to the cTRX of the oil samples, the
amount of ACW Ascorbic Acid equivalents (cAA) in WSE show an
almost complementary relation. This relationship confirms the
explanation of hydrolysis of phenolic glycosides and quinic acid
esters and the extraction of the obtained aglycones by hexane stated
above. Results show that at 130 C cAA decreases with te. At
160 C, primarily cAA also decreases with extraction time but after
30 min of extraction it suddenly starts to increase, which could be
a consequence of hydrothermal degradation of antioxidants that at
130 C are stable enough to remain unchanged in the applied
extraction time period but start to decompose at 160 C after
longer exposure times. It is well possible that these newly formed
antioxidants have better solubility in the aqueous phase, therefore
could not have been extracted to the oil phase in the phase separation
step.