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Table 4 Determination of MLT in laboratory prepared mixtures containing different percentages of compound 10 using the proposed methods

From: New spectrofluorimetric methods for determination of melatonin in the presence of N-{2-[1-({3-[2-(acetylamino)ethyl]-5-methoxy-1H-indol-2-yl}methyl)-5-methoxy-1H-indol-3-yl]- ethyl}acetamide: a contaminant in commercial melatonin preparations

Mix. No.

% of compound 10

Concentration of MLT(ng ml-1)

Second derivative method

PCR method

PLS method

Recovery % of MLT

Recovery % of MLT

Recovery % of MLT

1

7

80

101.11

100.45

100.15

2

20

80

102.69

101.72

101.43

3

40

60

99.75

100.06

99.77

4

50

100

102.84

100.62

100.32

5

60

40

99.05

101.57

101.28

   

101.09 ± 1.701

100.88 ± 0725

100.59 ± 0.728