Sample matrices of different origin were spiked with all the target
compounds at a concentration between 1 and 10 lg/mL and
injected into the GC system using the two selected ratios for standards,
namely sample:MSTFA volume ratios of 2:1 and 2:3. Fig. 2
shows that the second condition led to a marked improvement in
the detection of polyphenols. This enhancement was especially