CHEMOMETRICS ASSISTED UV-SPECTROPHOTOMETRIC ...

Table 16. Predicted concentrations of benzoic acid and salicylic in laboratory prepared mixtures
and in white field ointment by using PCR technique:
Benzoic acid Salicylic acid
Concentrations Recovery %+RE* Concentrations Recovery %+RE
50 49.22 98.4+1.55 10 10.12 101.2+1.60
45 44.50 98.9+1.76 15 15.08 100.6+1.67
40 39.64 99.1+1.92 20 20.15 100.8+1.81
35 35.12 100.3+1.95 25 24.96 99.8+1.01
30 30.14 100.5+1.04 30 30.01 100.0+1.22
25 24.89 99.6+1.44 35 34.38 98.2+0.89
20 19.89 99.5+0.96 40 39.34 98.4+1.56
15 15.10 100.7+0.93 45 44.40 98.7+0.92
10 9.97 99.7+1.33 50 49.67 99.3+1.22
White field ointment:
40 40.37 100.9+1.83 20 19.64 98.2+1.23
*Relative error as calculated from the corresponding calibration model (n=3)
Table 17. Predicted concentrations of salicylic acid and resorcinol in laboratory prepared
mixtures and in luna soap and dorin emulsion by using PCR technique;
Salicylic acid Resorcinol
Concentrations Recovery %+RE* Concentrations Recovery %+RE
10 10.20 102.0+2.05 5 4.92 98.3+1.93
10 10.18 101.8+1.57 10 9.86 98.6+2.11
5 4.98 99.7+1.44 10 9.92 99.2+1.78
Dorin emulsion:
10 9.93 99.3+1.84 5 5.06 101.1+1.15
Luna soap:
10 10.14 101.4+1.78 10 10.17 101.7+1.76
*Relative error as calculated from the corresponding calibration model (n=3)
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