Table 3 Analytical performance data for determination of the RUP, DES, FEX and MKT by the proposed method

Range (µg/mL)

1–10

1–10

1–24

1–10

Intercept (a)

69.257 × 10³

28.005 × 10³

35.029 × 10³

7.101 × 10³

Slope (b)

67.954 × 10³

39.874 × 10³

62.346 × 10³

68.516 × 10³

Correlation coefficient (r)

0.9998

0.9997

0.9999

0.9999

S.D. of residuals (S_y/x)

6.420 × 10³

4.369 × 10³

8.501 × 10³

3.841 × 10³

S.D. of intercept (S_a)

5.342 × 10³

3.636 × 10³

5.628 × 10³

3.196 × 10³

S.D. of slope (S_b)

0.834 × 10³

0.568 × 10³

0.461 × 10³

0.499 × 10³

Percentage relative standard deviation (% RSD)

1.05

1.22

1.36

0.99

Percentage relative error (% Error)

0.472

0.544

0.60

0.44

Limit of detection, LOD (µg/mL)

0.26

0.30

0.27

0.15

Limit of quantitation, LOQ (µg/mL)

0.78

0.91

0.82

0.47