Parameter

NEB

HCTZ

S.D. of Peak Area % R.S.D. S.D. of  Peak Area % R.S.D
Mobile Phase Composition
Toluene: ethyl acetate: methanol: ammonia (3.2:2.9:1.9:0.1) 67.14 1.78 145.80 1.25
Toluene: ethyl acetate: methanol: ammonia (2.8:2.5:1.5:0.1) 50.08 1.34 133.44 1.16
Mobile Phase Volume
7.5 ml 74.30 1.95 140.25 1.21
15 ml 51.43 1.37 150.05 1.29
Development distance
8 cm 69.38 1.84 128.76 1.11
8.5 cm 50.17 1.33 64.20 0.56
9 cm 39.37 1.01 105.09 0.90
Duration of saturation  
20 min 67.75 1.72 142.84 1.24
25 min 54.69 1.38 65.65 0.56
30 min 49.57 1.28 110.06 0.95
Activation of prewashed plates
5 min 76.97 1.98 193.34 1.66
10 min 64.52 1.71 197.03 1.70
15 min 61.81 1.69 161.87 1.39
Time from spotting to chromatography
30 min 65.71 1.75 119.17 1.02
60 min 63.80 1.70 170.42 1.47
Time from chromatography to scanning
30 min 47.48 1.25 131.04 1.12
60 min 71.68 1.91 145.70 1.25
Table 4: Results from robustness studies.