J. Planar Chromatogr. 25, 426-432 (2012). HPTLC of shanzhiside methyl ester (1) and barlerin (2) on silica gel with chloroform - methanol 4:1. Quantitative determination by absorbance measurement at 240 nm. The hRf of compounds (1) and (2) were 30 and 48, respectively. Linearity was in the range of 200-1000 ng/zone. Limits of detection and quantification were found to be 13 and 22 ng/zone for (1) and 18 and 31 ng/zone for (2), respectively. Recovery was found to be 99.2-99.5 % for (1) and 98.9-99.2 % for (2), respectively. The method showed comparable results to a validated HPLC method.

J. Liq. Chromatogr. Relat. Technol. 35, 28-39 (2012). HPTLC of metformin hydrochloride and glipizide in tablet formulation on silica gel with water - methanol 3:1 + 1 drop ammonia. Quantitative determination by absorbance measurement at 236 nm. The hRf value of compounds (1) and (2) were 22 and 85 and selectivity regarding matrix was given. Linearity was in the range of 5000-25000 ng/band for (1) and 50-250 ng/band for (2). Limits of detection and quantification were 991 and 3003 ng/band for (1) and 10 and 29 ng/band for (2), respectively. Recovery (by standard addition) was between 98.1 and 101.5 % for both (1) and (2).

J. Planar Chromatogr. 25, 283-289 (2012). HPTLC of mesembranol (1), mesembrenol (2), mesembrine (3) and mesembrenone (4) in the aerial parts of Sceletium tortuosum on silica gel with dichloromethane - methanol 9:1 + 1 drop ammonia. Quantitative determination by absorbance measurement at 280 nm. The hRf values for compounds (1) to (4) were 8, 28, 60 and 71, respectively. Linearity was in the range of 180-240 ng/band for (1) to (3) and 60-300 ng/band for (4). Limits of detection and quantification were 25 and 75 ng/band for (1), 31 and 95 ng/band for (2), 27 and 80 ng/band for (3) and 18 and 44 ng/band for (4), respectively. The intermediate/inter-day/intra-day precision was below 1.6 %. Mean recovery for the compounds was between 90.1 and 104.7 %.

J. Planar Chromatogr. 25, 122-126 (2012). HPTLC of 4-tert-butyl, 4-methoxydibenzoylmethane along with a photostabilizer on silica gel, then exposed to solar simulated sunlight and developed with n-hexane - ethyl acetate 9:1. Detection under UV 366 nm. Quantitative determination of the amount of sunscreen left after solar exposure by absorbance measurement at 357 nm.

J. Planar Chromatogr. 26, 86-92 (2013). HPTLC of carteolol on silica gel with chloroform - methanol 5:1. Quantitative determination by absorbance measurement at 254 nm. The hRf of carteolol was 31. Linearity was in the range of 200-1200 ng/zone. LOD and LOQ were 34 ng/zone and 104 ng/zone, respectively. Intermediate precision was below 2 %. The method could effectively separate the drug from its degradation products.

J. Planar Chromatogr. 25, 108-111 (2012). HPTLC of indole acetic acid (1), indole butyric acid (2), and absisic acid (3) in watermelon seeds exposed to heavy metals on silica gel with cyclohexane - methanol - 2-propanol 4:2:1 +1 drop ammonia. Quantitative determination by absorbance measurement at 230 nm. Limit of quantification was 10 ng/zone for (1) and (2) and 6 ng/zone for (3).

J. Liq. Chromatogr. Relat. Technol. 36, 2422-2430 (2013). HPTLC of glimepiride (1) and its main degradation impurities, glimepiride-sulfonamide (2), and glimepiride-carbamate (3) in pharmaceuticals on silica gel with toluene - ethyl acetate - methanol 8:5:1. Quantitative determination by absorbance measurement at 230 nm. The migration distances of (1), (2) and (3) were 48, 43 and 35 mm, respectively. LOD for the impurities (2) and (3) were found to be 2.2 and 2.3 ng/zone, respectively. LOQ values for the impurities (1) and (2) were 7.2 and 7.7 ng/zone. Intermediate precision was below 4.2 % (n=6). Recovery (by standard addition) was in the range of 94.9-102.3 % for (1) to (3).

Food Chem. 146, 104-112 (2014). HPTLC-Vis-ESI-MS of major anthocyanins in powder berry extracts of bilberry, blueberry, chokeberry, açai berry and cranberry on silica gel with ethyl acetate - 2-butanone - water - formic acid 35:15:4:6 in the first run (for anthocyanins) and ethyl acetate - toluene - formic acid - water 50:15:6:4 in the second run merely for the cut upper plate part (for anthocyanidins). Quantitation by absorbance measurement using a 4-point calibration at 520, 530 and 555 nm (multiwavelength scan). Correlation coefficients were between 0.9988 and 0.9999. Repeatability of sample analysis (n=3) was below 3.6 %. For confirmation of the results or characterisation of unknown anthocyane zones, mass spectra were recorded. Chromatography was directly linked to the effect using DPPH* reagent and the luminescent Aliivibrio fischeri bioassay.The method demonstrated to be a rapid, visually appealing alternative to known HPLC methods.