The linear range, calibration curve, correlation coefficient and
limit of detection for the present method are listed in Table 2.
As the peak area integration for the standard solution from
0.2 mg/kg to 1 mg/kg did not have good linearity, these three
concentrations were not adopted in the calibration curve. The
limit of detection for the present method was 2 mg/kg, which
was lower than the 10 mg/kg limit of detection with the previous
acetylacetone UV detection method without separation
by HPLC [15].