J. Sep. Sci. 46, 2300198 (2023). HPTLC of asphaltenes-containing petroleum materials: saturated, aromatics, resins, asphaltenes group-type composition on silica-coated quartz rods with a reverse order of the subsequent elution steps, where the solvent polarity was simultaneously reduced and the chromatogram development distance increased in the following order: dichloromethane - methanol 19:1, 3 cm; toluene, 6 cm; and n-hexane, 10 cm. After each development step, the frame was placed in an oven at 70 °C until completely dried and placed in a desiccator for 10 min. Chromatograms were obtained based on the electrometer analog signal generated during the mechanical movement of individual rods in the air-hydrogen flame of the TLC–FID analyzer. 

J. AOAC Int. 100, 922-934 (2017). HPTLC of monoacylglycerol, diacylglycerol, triacylglycerol, and glycerol in lubricating oils applied in cutting devices on silica gel in a three-step elution carried out toward increasing strength of the mobile phase: the elution up to 100 % of the plate’s height in n-hexane; step 2: the elution up to 60 % of the plate’s height in toluene; and step 3: the elution up to 30 % of the plate’s height in dichloromethane - methanol 19:1. Detection by exposure to iodine vapor and under UV light at 254 and 366 nm. Further analysis by coupling with a flame ionization detector.

Chinese J Oil Refining & Chem. Ind. 32 (6), 70-72 (2021). The output of coal tar accounts for about 3-4 % of the coal quantity in the furnace, which mainly contains benzene, toluene, xylene, naphthalene, anthracene and other components, and can be refined into phenolic oil, anthracene oil, asphalt and other products. These are widely used in dyes, medicine, spices, pesticides and other industries. Presentation of a method by using rod chromatography (rod TLC) / FID under optimized experimental conditions: TLC of 0.04 g/mL coal tar on activated chrombars under constant humidity conditions were developed in turn (A) with heptane to 11 cm, (B) with toluene to 6.5 cm and (C) with dichloromethane to 4.0 cm. The chrombars were scanned by FID and the content of saturated hydrocarbons, aromatic hydrocarbons, glia and bitumen was calculated by referring to the correction factors used in the determination of the four components in decompression slag oil. The method has been applied to four batches of coal tar samples or coal tar intermediate products produced by different process with satisfactory results, and proved to be simple, fast, economically feasible and suitable for coal chemical enterprises to quickly detect the change of coal tar composition, and to provide data reference for adjusting the device process parameters.

Chemosphere. 233, 936-945 (2019). HPTLC of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) in marine sediments on silica gel with n-hexane - dichloromethane - toluene 14:5:1. Qualitative identification using the wavelengths 190-310  nm. Toxicological potential of the sediment samples was determined by the intrinsic fluorescence of Aliivibrio fischeri by dipping into the bacteria solution and analysis with a BioLuminizer. 

Biochemical Systematics and Ecology 26, 655-662 (1998). TLC of 1-phenyl-5-viny-5.9-dimethyl-decane on silica gel with hexane - chloroform 73:27.

CBS 81, 6-7 (1998). HPTLC-AMD on silica gel with a gradient based on methanol – dichloromethane – n-hexane. Quantification by densitometry with absorbance measurement at 220 nm and fluorescence measurement at 366/>400 nm.

CBS 108, 12-15 (2012). HPTLC of anthracene (ANT), benzo[b]fluoranthene (BBF), benzo[k]fluoranthene (BKF), pyrene (PYR), acenaphthene (ACE), benzo[a]anthracene (BAA), benzo[a]pyrene (BAP), benzo[ghi]perylene (BPE), chrysene (CHR), dibenzo[a,h]anthracene (DBA), indeno[1,2,3-c,d]pyrene (IND), fuorene(FLU), fuoranthene (FLA), and phenanthrene (PHE) in toys on RP-18 phase with acetonitrile - water 9:1 by three-fold development over 45, 55 and 65 mm using automated multiple development (AMD) under nitrogen. Detection at 254 and 366 nm. Quantitative fluorescence measurement at different excitation wavelengths with cut-off filters: 220 nm/>320 nm for ACE, 250/>320 for ANT, 366/>400 for BAA and BAP, 270/>400 for BBF, BPE, BKF, CHR, DBA, FLA, IDN (after dipping in nitromethane), 250/>320 for FLU and PHE and at 270/>320 for PYR. Polynomial regression with high coefficients of correlation and low standard deviations. Coeffivients of variation for repeatability and reproducibility were below 10 %. This method allows the determination of 14 of the 16 PAHs. With LODs of 0.1-0.2 mg/kg the demands for the German GS mark (label for checked safety) are fulfilled. The results by HPTLC were comparable to results obtained by GC-MS.

J. Liq. Chromatogr. Relat. Technol. 37, 2846-2856 (2014). HPTLC fingerprinting of materials originated from cold surfaces of biomass fuel and fossils-fired home heating ovens, as well as truck exhaust systems and asphalt concrete samples on RP-18 with n-hexane. Fluorescence detection at UV 366 nm and absorbance detection (fluorescence inhibition) at UV 254 nm. The method can be used to identify wrong combustion parameters or unsuitable fuel.