J. Liq. Chrom. & Rel. Technol. 22, 1579-1587 (1999). HPTLC of theophylline, caffeine, and acetaminophen on silica gel after pre-cleaning of the plates with chloroform - methanol 1:1 with toluene - isopropanol - acetic acid 16:2:1. Detection of the spots under UV 254 nm. Quantitation by densitometry at 278 nm in reflectance/absorbance mode. Selective, sensitive, cost effective TLC procedure.

60th Indian Pharmaceutical Congress PA-226 (2008). HPTLC of olmesartan medoxomil (an angiotensin-II antagonist) on silica gel with toluene - acetonitrile - methanol - ethyl acetate - acetic acid (mobile phase ratio not specified by the authors). The hRf value was 56. Quantitative determination by absorbance measurement at 262 nm. The linearity was between 300-800 ng/spot. The method was suitable for separation of olmesartan medoxomil from degradation products obtained by forced stress conditions (acid, alkali, peroxide, light, heat).

J. Planar Chromatogr. 15, 38-41 (2002). Study of the effect of impregnating TLC plates with some synthetic peptides and aspartic acid on the speed of migration of 3-(w-aminoalkyl)-5,5-dialkyl-(or spirocycloalkyl-1',5)hydantoin derivatives of phenylpiperazines and comparison of the results with the affinity of the impregnants for 5-HT 1A and 5-HT 2A receptors. TLC of 10 5-HT 1A and 5-HT 2A compounds on silica gel impregnated with H-Asp-OH, H-Asp-Ile-OH, H-Leu-Asp-Val-Leu-OH, and H-Ala-Asp-Val-Leu-OH with chloroform - methanol 10:1. Visualization under UV and by use of an iodine chamber.

60th Indian Pharmaceutical Congress PA-218 (2008). TLC of aceclofenac and paracetamol on silica gel with toluene - isopropylalcohol - ammonia 8:7:1. The hRf value of aceclofenac was 24 and of paracetamol 68. Quantitative determination by absorbance measurement at 254 nm. Linearity was in the range of 25-2000 ng/band with correlation coefficients of 0.9998 for aceclofenac and 0.9996 for paracetamol. The limits of detection and quantification were 25 and 150 ng/zone for aceclofenac and 50 and 200 ng/zone for paracetamol. Both drugs were subjected to acid and alkali hydrolysis, oxidative degradation, and photodegradation. The degradation products were well resolved from the pure drug.

Abstract No. F-238, 61st IPC (2009). HPTLC of salbutamol silphate and guaiphenesin, used as pharmaceutical syrup against cough, on silica gel with ethyl acetate - methanol - 25 % ammonia 15:3:2. The hRf value was 47 and 65 for salbutamol and guaiphenesin, respectively. Quantitative determination by absorbance measurement at 280 nm. The method was linear in the range of 200-1000 ng/band for salbutamol and 10-15 µg/band for guaiphenesin.

J. AOAC Int. 92, 1082-1087 (2009). HPTLC of alprazolam and fluoxetine hydrochloride in pure powder and formulations on silica gel with acetone - toluene - ammonia 12:7:1 in a twin trough chamber saturated for 30 min. Quantitative determination by absorbance measurement at 230 nm. There was no significant difference in the determined content of alprazolam and fluoxetine by HPTLC and HPLC methods (assay results compared by applying the paired t-test).

Abstract No. F-275, 61st IPC (2009). HPTLC of ivabradine HCl on silica gel with methanol - chloroform 1:1. The hRf value was 59. Quantitative determination by absorbance measurement at 285 nm. Linearity was in the range of 100-800 ng/spot with r2=0.9989 (via peak area).

Abstract No. F-257, 61st IPC (2009). HPTLC of tadalafil on silica gel with n-hexane - ethyl acetate - acetonitrile 14:3:3. The hRf value was 65. Quantitative determination by absorbance measurement at 215 nm. The method was linear in the range of 10-60 ng/band. The drug was subjected to different stress conditions (acid, alkali, oxidative, photodegradation, thermal) and showed degradation under all stress conditions. Degradation products and excipients of the formulation were well separated from the main component.