60th Indian Pharmaceutical Congress PA-217 (2008). HPTLC of oleanolic acid in total methanolic extract of fruits of Randia dumetorum lam. on silica gel with toluene - ethyl acetate - acetic acid 70:30:1 in a twin trough chamber saturated for 10 min. Detection by treatment with 10 % sulphuric acid in methanol, followed by heating at 110 °C and immediate densitometric evaluation. Quantitative determination by absorbance measurement at 540 nm. The method was linear in the range of 50-500 ng/spot. Recovery was in the range of 99.4-100.8 %.

J. Planar Chromatogr. 22, 235-240 (2009). HPTLC of pesticides (clofentezine, neburon, chlorfenvinphos, lenacyl, trifluralin, thiram, procymidone, flufenoxuron, tralkoxydim, propaquizafop, dinoseb) and water samples (sample preparation by solid phase extraction) on silica gel with ethyl acetate - n-heptane 1:4 and 3:7 in a horizontal chamber. Quantitative determination by diode array densitometry in the range of 200 to 600 nm. The limit of detection was between 40 and 650 ng/spot and the limit of quantification was between 120 and 1920 ng/spot.

Br. root powder and extract. J. Planar Chromatogr. 22, 453-456 (2009). HPTLC of 2-hydroxy-4-methoxybenzaldehyde and biological extracts on silica gel with toluene - ethyl acetate - acetic acid 7:2:1 in a twin trough chamber saturated for 20 min. Quantitative determination by absorbance measurement at 277 nm.

Abstract No. 91334, IHCB (2009). Standardization of Tinospora cordifolia extract by HPTLC of syringic acid on silica gel with chloroform - methanol 8:1. The hRf value of syringic acid was 53. Quantitative determination by absorbance measurement at 254 nm.

J. Planar Chromatogr. 22, 349-354 (2009). HPTLC of flurbiprofen (2-(3-fluoro-4-phenyl)phenylpropanoic acid) and degradation products on silica gel, prewashed with methanol, with chloroform - acetone - xylene 5:2:1 in a twin trough chamber saturated for 20 min. Quantitative determination by absorbance measurement (the authors report no wavelength). Linearity was between 50 and 600 ng/band. The limit of detection and quantification was 10 and 32 ng/band, respectively.

Abstract No. F-284, 61st IPC (2009). HPTLC of diclofenac sodium and thiocolchicoside on silica gel with toluene - ethyl acetate - methanol 5:3:2. The hRf value was 17 and 53 for thiocolchicoside and diclofenac sodium, respectively. Quantitative determination by absorbance measurement at 285 nm. The method was linear in the range of 50-300 ng/band for both drugs. Recovery was 100.5-101.1 %.

J. Planar Chromatogr. 22, 283-286 (2009). HPTLC of withaferin and extracts of the powdered root on silica gel, prewashed with methanol, with toluene - ethyl acetate - acetone 2:3:3 in a twin trough chamber saturated with mobile phase for 30 min. Detection by spraying with anisaldehyde reagent followed by heating for 15 min at 105 °C; characteristic orange fluorescence was observed for whithaferin. Quantitative determination by absorbance measurement at 214 nm. The limit of detection and quantification for withaferin A was 258 and 782 ng/zone, respectively.

60th Indian Pharmaceutical Congress PG-261 (2008). HPTLC of quercetin and rutin in ethanolic extracts of aerial parts of Tylophora indica and Tephrosia purpurea on silica gel with ethyl acetate - formic acid - acetic acid - water 100:11:11:26. Quantitative determination by fluorescence measurement at 366/>400 nm. The extract of Tephrosia purpurea contained 1.56 % of quercetin and 1.40 % of rutin, whereas Tylophra indica contained 4.30 % of quercetin.