J. Planar Chromatogr. 24, 419-422 (2011). TLC of levamisole on silica gel with methanol - toluene - chloroform 14:35:50 in a twin-trough chamber saturated for 15 min at 25 °C. The hRf value was 30. Quantitative determination by densitometry in absorbance mode at 223 nm. Linearity was between 50 and 2000 ng/zone. The recovery was 88.4-102.6 %. The %RSD for intra-day and inter-day precision was 1.9 % and 2.0 %, respectively. The LOD and LOQ was 2 and 7 ng/zone, respectively.

J. Planar Chromatogr. 24, 316-319 (2011). HPTLC of Palmarosa oil extracts in toluene and geraniol on silica gel with toluene - ethyl acetate 37:3 in a twin-trough chamber saturated for 30 min at 25 +/- 2 °C. Detection by spraying with 3 % vanillin in ethanol - sulfuric acid 49:1 followed by heating at 100 °C for 5 min. Quantitative determination by densitometry in absorption mode at 400 nm. The instrumental precision and the repeatability (n = 6), was 0.3 and 3.2 %, respectively. LOD and LOQ was 1.4 and 2.8 µg/mL, respectively. The intra-day recovery was 99.8 % and the inter-day recovery 99.4 %. The hRf value for geraniol was 36.

J. Planar Chromatogr. 24, 301-305 (2011). HPTLC of a methanolic extract of E. littorale Blume and isovitexin on silica gel with acetonitrile - water 3:2 at room temperature (28 +/- 2 °C) in a twin-trough chamber saturated for 30 min. Quantitative determination by densitometry at 350 nm. Linearity was between 100-400 ng/band. The %RSD for instrumental precision, intra-day precision, and intermediate precision was less than 2 %. The recovery was 99.7 %. The limit of detection and quantification was 0.6 and 1.9 ng/band, respectively.

J. Planar Chromatogr. 23, 369-372 (2010). HPTLC of venlafaxine hydrochloride on silica gel with concentration zone, prewashed with methanol, with toluene - methanol 17:7 in a twin-trough chamber saturated for 10 min at 25 +/- 2 °C. Quantitative determination by absorbance measurement at 228 nm. The hRf value was 19. The validated calibration range was 400-2000 ng/band (r = 0.999). Recovery was 98.8-100.3 %. The intra-day precision as %RSD was 0.3-0.6 % and the inter-day precision 0.1-0.3 %. The LOD and LOQ were 97 ng and 294 ng, respectively.

J. Planar Chromatogr. 24, 166-171 (2011). HPTLC of brimonidine tartrate as the bulk drug and in formulations on silica gel with methanol - toluene - triethylamine 10:35:2. The hRf value was 48. Quantitative determination by densitometry in absorbance mode at 247 nm. Linearity was between 100 and 600 ng/band (r² = 0.9965). LOD and LOQ were 9 and 28 ng/band, respectively. The intra-day and inter-day precision (%RSD, n = 3) was 1.1-1.2 % and 0.5-1.0 %, respectively. Recovery was between 98.7-100.4 %. The repeatability of application (%RSD, n = 6), was 1.6 %.

J. Planar Chromatogr. 24, 23-29 (2011). TLC of cephalexin, cefadroxil, cefazolin, cefaclor, cefuroxime axetil, ceftriaxone, and cefotaxime on silica gel with chloroform - ethyl acetate - glacial acetic acid - water 4:4:4:1. Quantitative determination by absorbance measurement at 275 nm. Accuracy was in the range of 98.3-100.8 % and precision (%RSD) was 0.4-2.5 %. LOQ were 0.1 µg/L for cefuroxime and 2.8 µg/L for cefotaxime. The method was highly reproducible with inter- and intra-day precisions between 0.24-0.25 %.

J. Planar Chromatogr. 24, 306-311 (2011). HPTLC of ethanolic leaf extracts of A. squamosa, with rutin and isoquercitrin as standards, on silica gel (prewashed with methanol) with ethyl acetate - formic acid - glacial acetic acid - ethyl methyl ketone - water 50:7:3:30:10 with chamber saturation for 30 min at room temperature (25 +/- 2°C) and a relative humidity of 50 +/- 5 %. Quantitative determination by densitometry at 366 nm. Linearity was between 200-1600 ng/band for both rutin and isoquercitrin. The robustness of the method (%RSD) was 1.9-2.9 % for rutin and 1.5-2.3 % for isoquercitrin, respectively. The instrumental precision (%RSD) was 0.9 and 0.3 % for rutin and isoquercitrin, respectively. The intra-day and inter-day precision (%RSD) was less than 3 % in all cases. LOD and LOQ was 75 and 100 ng/band for rutin and 40 and 80 ng/band for isoquercitrin, respectively. The hRf value was 32 for rutin and 58 for isoquercitrin. Recovery (by standard addition) was found to be 96-107 %.

J. Planar Chromatogr. 24, 541-544 (2011). HPTLC of alpha-asarone (alpha-(1,2,4-trimethoxy-5-[(E)-prop-1-enyl]benzene) in rhizome extracts of Acorus calamus on silica gel with toluene - ethyl acetate 8:3 in a twin-trough chamber with saturation for 30 min. Detection and quantitative determination by densitometry at 254 nm. The linearity was in the range of 200-1000 ng/zone with a correlation coefficient of 0.996. The hRf was 71. LOD and LOQ of the standard were 60 and 173 ng/zone, respectively. Robustness was performed at concentration levels of 200, 400, and 800 ng/zone and the %RSD of peak areas was calculated. The %RSD for robustness analysis was less than 2 % in all cases, which indicated that the experimental procedure was in the range of acceptability as there was not much deviation.