J. Planar Chromatogr. 25, 450-455 (2012). HPTLC of L-carnitine in dietary supplements on cellulose with methanol - water 5:1 + 1 drop glacial acetic acid. Detection by spraying with ninhydrin reagent. Quantitative determination by absorbance measurement at 420 nm. The hRf of L-carnitine was 65. Linearity was in the range of 10-40 µg/zone. Limits of detection and quantification were 3 and 8 µg/zone, respectively. Precision (%RSD) was below 1.6 %. Recovery was in the range of 99.5 and 103.6 %.

J. Liq. Chromatogr. Relat. Technol. 35, 1731-1749 (2012). HPTLC of atazanavir sulfate (1) and ritonavir (2) in fixed dosage on silica gel with toluene – methanol – glacial acetic acid – ethyl acetate 14:1:3:4. Quantitative determination by absorbance measurement at 254 nm. The hRf values of (1) and (2) were 50 and 63, respectively. Linearity was 30-300 ng/zone for (1) and 10-100 ng/zone for (2). The intermediate/inter-day/intra-day precision was 0.3 % for (1) and 0.7 % for (2) (n=6). The limit of detection and quantification was 16 and 49 ng/zone for (1) and 18 and 55 ng/zone for (2), respectively. Recovery (by standard addition) was 99.9 % for (1) and (2). The results were in accordance with those by a validated HPLC method.

Chinese J. of Inform. on TCM 17 (12), 48-50 (2010). Fuyanshuan suppository is a herbal TCM preparation for heat clearing, detoxifying, eliminating stagnation, regulating the flow of vital energy and invigorating the circulation of blood. For quality control TLC of the extracts of the preparation 1) for Ajuga becumbens Thunb., on silica gel with cyclohexane - chloroform – ethyl acetate – glacial acetic acid 40:10:16:1, detection by spraying with 10 % sulfuric acid in ethanol and heating at 100 °C, evaluation under UV 366 nm or daylight; 2) for Lonicera japonica, on silica gel with chloroform – acetone – formic acid 3:2:1, detection by exposure to daylight for 10 min and viewing under UV 366 nm.

J. Chil. Chem. Soc. 57, 1033-1035 (2012). HPTLC of propanolol hydrochloride (1) and flunarizine dihydrochloride (2) in combined dosage form on silica gel with methanol - toluene - ammonia 14:6:1. Quantitative determination by absorbance measurement at 267 nm. The hRf of compounds (1) and (2) were 63 and 48, respectively. Linearity was in the range of 800-4800 ng/zone for (1) and 200-1200 ng/zone for (2). Limits of detection and quantification were 25 and 75 ng/zone for (1) and 16 and 48 ng/zone for (2), respectively. Intermediate/intra-day/inter-day precision was below 2.0 % (n=6). Recovery for both (1) and (2) was between 99.3 and 100.9 %.

J. Planar Chromatogr. 25, 456-462 (2012). HPTLC of loratadine (1) and desloratadine (2) on silica gel with methanol + 1 drop ammonia. Quantitative determination by absorbance measurement at 254 nm. The hRf values of (1) and (2) were 76 and 20, respectively. Linearity was in the range of 250-850 ng/band for (1) and 100-1000 ng/band for (2). Limits of detection and quantification were 90 and 250 µg/band for (1) and 30 and 100 µg/band for (2), respectively. Intra- and inter-day precisions were found to be less than 2 %. Recoveries were between 97.8 and 101.5 % for both (1) and (2).

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.

CBS 107, 5-7 (2011). HPTLC of coenzyme Q10 in toluene extracts of soft gel capsules on silica gel (pre-washed by development from both sides with methanol) with toluene in the horizontal developing chamber from both sides. Detection under UV 254 nm. The hRf value of coenzyme Q10 is 20. Quantitative absorption measurement at 282 nm, evaluation via peak height. Linearity was in the range of 20-50 ng/band. Polynomial calibration ranged 20-150 ng/band. The parallel analysis of 60 samples (10 samples each from 6 batches) and 12 standards required only 86 min. The test for content uniformity was performed with 10 samples according to the European Pharmacopoeia and the USP 34 and the requirements were met.

J. Planar Chromatogr. 25, 168-173 (2012). HPTLC of arbutin in commercial whitening creams with methanol - chloroform - acetic acid 7:12:1. Quantitative determination by absorbance measurement at 254 nm. The hRf value of arbutin was 40. LOD and LOQ were found to be 42 and 112 ng/zone, respectively.