J. Chromatogr. Sci. 33, 316-320 (1995). Use of the addition of a-, b-, g-, and hydroxypropyl-b-cyclodextrins to aqueous mobile phases to enhance the migration of p-nitroanilines and their analogues on TLC. Determination of the equilibrium binding constants for the solute-cyclodextrin complexes formed in the mobile phase. Comparison of the results obtained using silica gel and polyamide plates. Urea, which is used to solubilize the cyclodextrins in aqueous solutions, is also found to increase the migration of the compounds.

CBS 99, 6-7 (2007). HPTLC of sildenafil in pharmaceutical products and herbal preparations (extracted with methanol) on silica gel with chloroform - methanol - diethylamine 90:10:1 in a twin-trough chamber saturated for 30 min. Quantitative determination by absorbance measurement at 305 nm. The hRf value of sildenafil was 48 and selectivity regarding matrix was given. The 4-level calibration (n=3) from 150 to 1200 ng/band showed a polynomial regression. Inter-day precision was <1 % (n=6). Mean recovery (by standard addition ) was 98.2 % for three different concentration levels.

62nd Indian Pharmaceutical Congress Abstract No. F-244 (2010). TLC of fluvoxamine maleate on silica gel with benzene – methanol 5:4. The hRf value was 52. Quantitative determination by absorbance measurement at 256 nm. The linearity was in the range of 500-3000 ng/band with r2=0.998. The drug was subjected to acidic, alkaline and oxidative, dry heat, UV and photolytic stress. Since the method could effectively separate the drug from its degradation products, it can be used for stability studies.

Trends Anal. Chem. 78, 84-94 (2016). Review on clean-up and recent advances in analysis of biogenic amines (BAs) in human body and dairy products of foodstuffs. TLC coupled with mass espectrometry was described as a common analytical technique used for analysis of BAs. Commonly used derivatizing reagents for chromatographic analysis of BAs were also described.

J. Chromatogr. 435, 256-257 (1988). TLC on sodium nitrite-impregnated silica with benzene - ethyl acetate 20:1. Detection by spraying with 2% sulfanilic acid in concentrated hydrochloric acid.

Planar Chromatogr. 4, 316-318 (1991). Separation of selected isomers by RPTLC and investigation of the dependence of Rf and RM values on the numerical values of topological indexes. TLC of a- and ß-naphthol and a- and ß-naphtylamine on Kieselguhr G impregnated with a 15% solution of paraffin oil in benzene; development with methanol - water 1:9, detection under UV 254 nm.

Kautschuk + Gummi - Kunstoffe 41 (9) 875-881 (1988). TLC of antioxidants IPPD (N-isopropyl-N'-phenyl-p-phenylene-diamine), 6PPD (N-1,3-dimethyl-butyl-N'-phenyl-diamine), N,N'-diaryl-PPD (N,N'-diaryl-p-phenylene-diamine) and TMQ (2,2,3-trimethyl-1,2-dihydroquinoline) on silica with chloroform - hexane - methanol - acetic acid 15:6:1:1. To remove plasticizers the TLC plate is chromatographed twice with petrol ether first. Detection by multi-wavelength scanning of UV absorbance at 240, 280, 320, 360 nm and visually by spraying with 3% ethanolic solution of 2,6-dichloroquinone-4-chlorimide. Additionally identification by recording of UV spectra. A further mobile phase system (toluene - hexane - methanol 29:15:6) is mentioned.

Separation of DNA fragments on composite agarose - linear polymer matrices. J. Chromatogr. A 871, 289-298 (2000). Study of the effect of hydrophilic linear polymer additives on the migration behavior of double stranded DMA molecules, ranging from 200-1000 base pairs in ultra-thin-layer agarose electrophoresis. Among the various polymers investigated, addition of linear polyacrylamide resulted in the best separation performance. The separation mechanism using composite matrices was discussed and the activation energy curves were plotted based on the slopes of the Arrhenius plots of the various composite matrices.