3.2. Characterization protocols of target analytes in fish
Individual identities of the interested compounds extracted
from fish were characterized based on comparison of the relative ion abundance ratios between the quantification and the qualifier ions signals. The presence of target compounds in the fish fillet extracts was confirmed when the difference of the relative abundance ratio was less than or equal to approximately ±20%, or an agreement of the relative abundance ratio of 80% or over. Fig. 3
compares typical mass spectra derived from the ion chromatogram (Fig. 2) for (A) standard TCS and (B) Whiting fillet extract solution. These display an excellent agreement of the mass spectral features/ signals with a variation of about ±10%. When similar agreement of ion relative abundance ratio and retention features were observed,
then the presence, characterization and quantification of other compounds in the different fish samples were established.