Asian J. Chem. 20(4), 2531-2538 (2008). TLC of melatonin on silica gel with toluene - ethyl acetate - formic acid 1091. Quantitative determination by absorbance measurement at 290 nm. The method was linear in the concentration range of 100 to 600 ng/spot. The recovery of the drug from tablets (by standard addition method) was 99.7 %. Statistical analysis proves that the method is repeatable, selective and accurate for the estimation of the drug. Forced degradation studies showed the effect of variations in pH, UV light and high temperature on the stability of melatonin. As the proposed method could effectively separate the drug from its degradation products, it can be employed as a stability indicating method.

62nd Indian Pharmaceutical Congress Abstract No. F-235 (2010). TLC of metformin and glimepiride on silica gel with 0.5 % ammonium sulfate – water – methanol – ethyl acetate 2211. Quantitative determination by absorbance measurement at 254 nm. The method was found to be linear in the range of 300-500 ng/band for glimepiride and 150-250 µg/band for metformin.

J. Planar Chromatogr. 28, 395-397 (2015). HPTLC of 25-B-NBOMe (a N-(2-methoxy)benzyl-substituted phenylethylamine hallucinogen) in seized blotters (small, square pieces of absorbant paper impregnated with LSD or other hallucinogens) on silica gel with cyclohexane – toluene – diethylamine 1532. Quantitative determination by absorbance measurement at 298 nm. The hRF value for 25-B-NBOMe was 34. Linearity was in the range of 19-115 ?g/zone. LOD and LOQ were 7 and 22 ?g/zone. The intermediate precision was below 6.3 % (n=6). Average recovery was 98 %.

J. Planar Chromatogr. 2, 163-164, (1989). Study of the chromatographic behavior of cis- and trans-2-m-chlorophenyl-, and 2-benzylhexahydroquinazolin-4(3H)-ones on silica by two-dimensional development with two times the same of four solvents at an interval of 20 hours. Detection by exposure to chlorine followed by spraying with TMD reagent. Ring-opening and ring-closure reactions were concluded.

Acta Pharmaceutica Hungarica 67, 81-88 (1997). TLC of glibenclamide on silica with benzene - acetic acid - ethyl acetate - acetone 6561230 or chloroform - cyclohexane - ethanol - acetic acid 9911.

J. AOAC Int. 91, 1186-1190 (2008). TLC of N-(hydroxymethyl)nicotinamide on silica gel with chloroform - ethanol 23. Quantitative determination by absorbance measurement at 260 nm.

62nd Indian Pharmaceutical Congress Abstract No. F-290 (2010). TLC of ranolazine on silica gel with methanol – 10 mM ammonium acetate 32. The hRf value was 54. Quantitative determination by absorbance measurement at 271 nm. The recovery was 99.9 %.

Planta Medica 82, 09/10, 903-909 (2016). To monitor the sorbent phase purification of a chloroform subfraction of the sponge Myxilla incrustans, TLC of fractions on silica gel with dichloromethane – methanol – formic acid 9001001, detection with Dragendorff’s reagent. The four positive fractions were purified by preparative HPLC, yielding three new N-acyl dopamine/dehydrotyrosine glycosides myxillins A, B and C.