The corresponding
absorption regions (1670–1625 cm1
) of the same six trans-free
oils are shown in Fig. 2(b). The relationship between the
area at 1670–1625 cm1
/1670–1625 cm1 and the area at
990–945 cm1
/990–945 cm1 was obtained from the spectra of
10 TFA-free oils. The linear regression of the data, plotted in
Fig. 3, yielded the following relationship:
y ¼