Amounts of chlorogenic acid (wCHA), caffeic acid (wCA) and
5-hydroxymethyl furfural (w5-HMF) present in the WSE are presented
in Table 3. Compared to the total phenolics content, it can
be observed that CHA is the main phenolic compound in WSE,
however its content quickly starts to decrease with te at temperatures
P100 C. It seems that the ester bond present in CHA (unlike
the ones present in the triglycerides) is not very stable in SubCW at
these conditions. At the same time the increase of CA with te can be
observed, what indicates that the derivative of CHA (CA) is formed
during extraction. Highest decomposition rate of CHA can be
observed at 160 C, with the lowest obtained yield of wCHA after
te = 5 min, which is 27.63 ± 0.66 mg/g ext. Although we would
expect CA to have a similar rate of formation as the decomposition
rate of CHA, we can observe that this is not the case. More CHA is
decomposed with te than CA is formed. Although further
hydrothermal degradation of CA is likely to occur at 160 C, a more
feasible explanation of this anomality is the previously mentioned
extraction of phenolics (CA) to OE in the phase separation step.
CHA could probably not be extracted with non-polar phase (hexane)
since its composition in WSE at 60 C does not change ovet te.
Amounts of chlorogenic acid (wCHA), caffeic acid (wCA) and
5-hydroxymethyl furfural (w5-HMF) present in the WSE are presented
in Table 3. Compared to the total phenolics content, it can
be observed that CHA is the main phenolic compound in WSE,
however its content quickly starts to decrease with te at temperatures
P100 C. It seems that the ester bond present in CHA (unlike
the ones present in the triglycerides) is not very stable in SubCW at
these conditions. At the same time the increase of CA with te can be
observed, what indicates that the derivative of CHA (CA) is formed
during extraction. Highest decomposition rate of CHA can be
observed at 160 C, with the lowest obtained yield of wCHA after
te = 5 min, which is 27.63 ± 0.66 mg/g ext. Although we would
expect CA to have a similar rate of formation as the decomposition
rate of CHA, we can observe that this is not the case. More CHA is
decomposed with te than CA is formed. Although further
hydrothermal degradation of CA is likely to occur at 160 C, a more
feasible explanation of this anomality is the previously mentioned
extraction of phenolics (CA) to OE in the phase separation step.
CHA could probably not be extracted with non-polar phase (hexane)
since its composition in WSE at 60 C does not change ovet te.
การแปล กรุณารอสักครู่..