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.

J. Liq. Chromatogr. Relat. Technol. 31, 1881-1891 (2008). HPTLC of various neutral lipid classes on silica gel (prewashed with dichloromethane - methanol 1:1) with petroleum ether - diethyl ether - acetic acid 80:20:1 in a twin trough chamber saturated for 20 min. Detection by spraying with 5 % ethanolic phosphomolybdic acid solution and heating for 10 min at 110 °C. Quantitative determination by absorbance measurement at 610 nm.

60th Indian Pharmaceutical Congress PA-49, (2008). HPTLC of alfuzosin hydrochloride on silica gel with toluene - methanol - triethyl amine 15:5:1. Densitometric evaluation at 245 nm. Linearity was in the range of 5-400 ng/spot. The method was stability indicating (acid, alkali, oxidation, dry and wet heat and photodegradation). The compound was stable to oxidation and alkaline degradation. The hRf value of the main zone was 63, and of additional zones 10 and 33. The method could effectively separate the main drug from the degradation products.

J. AOAC Int. 91, 1203-1209 (2008). HPTLC of atrazine, clofentezine, chlorfenvinphos, hexaflumuron, terbuthylazine, lenacyl, neburon, bitertanol, and metamitron on silica gel with ethyl acetate - n-heptane 1:4, 3:7, 2:3, or 7:3 in a horizontal chamber. Detection by scanning in the range of 200 to 600 nm with a TLC-DAD scanner.

J. Pharm. Res. 6(4), 233-235 (2007). HPTLC of ofloxacin and satranidazole on silica gel with n-butanol - ethanol - ammonia 5:5:4. Quantitative determination by absorbance measurement at 320 nm. The method was linear in the range of 200-1000 ng/spot (ofloxacin) and 300-1500 ng/spot (satranidazole) with a recovery of 99.1 - 99.9 % for both component. The hRf value was 54 for ofloxacin and 83 for satranidazole. The method is suitable for routine quality control of raw material and formulations.