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Table 3 Matrix of the chromatographic and extraction conditions suggested by software and responses obtained experimentally for each run (mean ± SEM, n = 3)

From: Development of an HPLC–UV method for quantification of posaconazole in low-volume plasma samples: design of experiments and machine learning models

Experiment number

Chromatographic conditions

 

Factors

Responses

A (%v/v)

B (%v/v)

C

D (℃)

E (mL/min)

PCZ RT (min)

IS RT

(min)

Resolution

1

52

0

3

25

1.00

11.3 ± 0.1

11.3 ± 0.1

0.0 ± 0.0

2

60

0

3

25

0.70

13.3 ± 0.0

14.5 ± 0.0

1.3 ± 0.0

3

52

6

3

25

0.70

24.8 ± 0.1

20.8 ± 0.0

4.6 ± 0.1

4

60

6

3

25

1.00

8.6 ± 0.0

9.0 ± 0.0

0.9 ± 0.0

5

52

0

7

25

0.70

23.3 ± 0.7

18.3 ± 0.2

4.7 ± 0.4

6

60

0

7

25

1.00

8.3 ± 0.0

8.3 ± 0.0

0.0 ± 0.0

7

52

6

7

25

1.00

20.7 ± 0.0

13.4 ± 0.0

10.1 ± 0.1

8

60

6

7

25

0.70

16.3 ± 0.3

14.5 ± 0.3

2.3 ± 0.3

9

52

0

3

40

0.70

20.6 ± 0.0

16.9 ± 0.9

1.9 ± 0.1

10

60

0

3

40

1.00

7.9 ± 0.1

8.3 ± 0.0

1.0 ± 0.1

11

52

6

3

40

1.00

15.6 ± 0.0

11.9 ± 0.0

5.8 ± 0.1

12

60

6

3

40

0.70

15.0 ± 0.0

15.0 ± 0.0

0.0 ± 0.0

13

52

0

7

40

1.00

14.3 ± 0.3

10.7 ± 0.0

5.4 ± 0.1

14

60

0

7

40

0.70

13.5 ± 0.1

12.8 ± 0.1

0.7 ± 0.1

15

52

6

7

40

0.70

31.8 ± 0.0

20.2 ± 0.1

9.9 ± 0.0

16

60

6

7

40

1.00

9.7 ± 0.2

8.4 ± 0.2

2.2 ± 0.4

17

56

3

5

33

0.85

14.5 ± 0.0

12.3 ± 0.0

3.5 ± 0.2

18

56

3

5

33

0.85

14.6 ± 0.1

12.3 ± 0.1

3.5 ± 0.4

19

56

3

5

33

0.85

15.4 ± 0.1

12.8 ± 0.0

3.8 ± 0.2

20

56

3

5

33

0.85

14.2 ± 0.2

11.8 ± 0.3

3.8 ± 0.2

Experiment number

Extraction conditions

 

Factors

Responses

A´ (μL)

C´ (%w/v)

D´ (min)

E´ (min)

PCZ recovery (%)

IS recovery (%)

500

3

0

1.0

10.0

55.7 ± 3.6

53.7 ± 1.2

1500

3

0

1.0

1.0

67.7 ± 1.5

60.3 ± 6.6

500

11

0

1.0

1.0

93.8 ± 3.0

58.2 ± 0.0

1500

11

0

1.0

10.0

98.1 ± 2.6

72.7 ± 4.2

500

3

10

1.0

1.0

36.4 ± 0.3

56.7 ± 1.6

1500

3

10

1.0

10.0

46.6 ± 0.6

56.1 ± 1.3

500

11

10

1.0

10.0

101.1 ± 2.1

57.0 ± 3.3

1500

11

10

1.0

1.0

62.0 ± 0.1

57.3 ± 0.2

500

3

0

10.0

1.0

56.6 ± 2.7

51.0 ± 2.0

10´

1500

3

0

10.0

10.0

81.7 ± 0.7

63.0 ± 6.9

11´

500

11

0

10.0

10.0

73.9 ± 0.8

44.9 ± 0.9

12´

1500

11

0

10.0

1.0

85.5 ± 4.6

63.6 ± 0.7

13´

500

3

10

10.0

10.0

30.3 ± 3.2

64.1 ± 4.0

14´

1500

3

10

10.0

1.0

51.4 ± 0.9

65.0 ± 1.4

15´

500

11

10

10.0

1.0

97.7 ± 1.5

80.9 ± 1.0

16´

1500

11

10

10.0

10.0

87.8 ± 0.1

69.8 ± 2.1

17´

1000

7

5

5.5

5.5

96.1 ± 0.4

77.6 ± 8.2

18´

1000

7

5

5.5

5.5

99.1 ± 0.9

70.8 ± 6.9

19´

1000

7

5

5.5

5.5

95.8 ± 1.9

76.8 ± 2.1

20´

1000

7

5

5.5

5.5

97.0 ± 0.8

75.0 ± 3.4

  1. A total organic phase, B methanol, C mobile pH, D column temperature, E flow rate, A´: volume of extraction solvent; B´: plasma pH; C´: NaCl; D´: extraction time; E´: centrifuge time; IS internal standard, PCZ posaconazole, RT retention time