J. Sep. Sci. 30, 2167-2172 (2007). HPTLC of clozapine in human serum on silica gel with chloroform - methanol 9:1. Quantitative determination by absorbance measurement at 290 nm. Linearity was between 10 and 100 ng/zone. The intra-assay variation was between 2.10 and 3.33 % (n=5) and inter-assay variation was between 2.67 and 4.44 % (n=9). The limits of detection and quantification were 0.03 and 0.05 ng/µL, respectively. Recovery was between 97.0 and 99.0 %, and selectivity regarding matrix was given.

Indian J. Pharm. Sci. 69(4), 594 (2007). HPTLC of nebivolol HCl in tablet dosage form, on silica gel with ethyl acetate - toluene - methanol - ammonia 10:60:20:1. Quantitative evaluation by densitometry at 280 nm. The hRf value was 33. Linearity was in the range of 100 - 600 ng/mL. Limit of detection and quantification was 30 and 100 ng/zone, respectively. The method was compared with an RP-HPLC method in respect of different analytical parameters. The RP-HPLC and the HPTLC method were found comparable, but the HPTLC method was more sensitive.

J. Planar Chromatogr. 20, 451-456 (2007). HPTLC of levetiracetam and oxcarbazepine on silica gel, prewashed with methanol, with toluene - acetone - methanol 3:1:1 in a twin-trough chamber saturated for 20 min at 25 °C. Densitometric evaluation in absorbance mode at 200 and 261 nm.

J. Planar Chromatogr. 20, 275-277 (2007). HPTLC of bergenin and gallic acid on silica gel with ethyl acetate - formaldehyde - acetic acid - water 80:1:2:1 in a saturated twin-trough chamber. Quantitation was performed by scanning at 260 nm in absorption mode.

J. Planar Chromatogr. 21, 49-54 (2008). Report of a new procedure for separation of complex mixtures by combining different modes of multidimensional planar chromatography on silica gel plates. Initially the complex mixture was separated into five groups of compounds. Mobile phases for separation of these different groups were then optimized by regarding each group as individual separation problem. By use of this new procedure 22 compounds from a complex mixture were separated on 10 x 10 cm TLC and HPTLC plates. TLC and HPTLC of 22 pesticides on silica gel with ethyl acetate - n-heptane 2:3 for TLC and 1:1 for HPTLC in the first direction. After removal of some of the adsorbent layer five further development steps with different eluents followed resulting in the complete separation of the 22 compounds of interest . Detection under UV 254 and 366 nm.

Indian Drugs 44 (12), 937-944 (2007). HPTLC of methanolic and ethyl acetate extracts of Sesamum indicum root on silica gel with ethyl acetate - n-hexane 1:9. Densitometric evaluation at 549 nm. The red zones were isolated by preparative TLC and identified by IR as 1,4 naphthoquinone derivatives.

J. Pharm. Res. 6 (4), 233-235 (2007). HPTLC of ofloxacin and satranidazole on silica gel with n-butanol - ethanol 5:5 containing 4 % ammonia. Densitometric analysis at 320 nm. The hRf value of ofloxacin and satranidazole was 54 and 83 respectively. Linearity was between 200 and 1000 ng/spot for ofloxacin and between 300 and 1500 ng/spot for satranidazole. Recovery was 99.1 - 99.8 % for both compounds.

J. Chromatogr. Sci. 46 (10), 907-911 (2008). Examination of M(DEDTC)2 (M = Cu, Co, or Ni) and M(PyDTC)2 (M = Cu or Co) complexes prepared by reactions of sodium diethyldithiocarbamate (NaDEDTC) and ammonium pyrrolidinedithiocarbamate (NH4PyDTC) with metal (II) nitrates. Qualitative analysis and separation using TLC systems in the literature. Reexamination and discussion of the already known separation behaviour of the mentioned metal cations and their complexes in the context of relation to the crystal field theory (CFT) and TLC. Based on the chromatographic data it was found that CFT is closely related to the TLC separation of these metal cations and their complexes. This study is useful in understanding the linkage between the CFT of coordination chemistry and the chromatographic parameters, e.g., hRf value and theoretical plate numbers of the complexes.