Actual sample matrices are complex and varying
viscosity with standard solutions. The electrophoretic mobility of
the analytes can be affected by solution conditions such as pH,
ionic strength and viscosity (Paull & King, 2003). So, the analytes
peak position shifts in actual sample occur. And there are many
unknown peaks appearing on the electrophoretogram. These factors
lead to difficult to identify peaks of ENRO and CIP according
to migration time in real sample. Therefore, the peaks were identified
using the standard addition methods. The analyte contents
found in the different samples are given in Table 2. The electropherograms
of standard sample solution and the pork samples
detected was shown in Fig. 4. The accuracy of the methods and
the potential matrix effects were established by analyzing spiked
samples. The adaptability of the method used was shown by the
acceptable recoveries of 85–102%.