J. Liq. Chrom. & Rel. Technol. 25, 1589-1598 (2002). TLC of formaldehyde, a metabolite of deprenyl [(-)-C14-N-methyl-N-propynyl-phenyl-isopropylamine], as dimedone adduct, on silica gel with chloroform - methanol - 25% NH3 100:10:1 and chloroform - triethanolamine 10:1. After drying, the radiolabeled spots of formaldemethone were located and visualized using x-ray film. Quantitation of the radioactivity elution and measuring in a liquid scintillation spectrometer. Detection of the standard under UV 254 nm.

59th Indian Pharmaceutical Congress C-43, 234, (2007). HPTLC of Z-guggulsterone (a steroidal ketone present in oily resin of Commiphora mukul) and five marketed ayurvedic tablet formulations containing guggul, on silica gel with toluene - propane-1-ol - glacial acetic acid 8:1:1. Densitometry at 254 nm. The hRf of E-guggulsterone was 55. Several marketed formulations were evaluated for Z-guggulsterone, the UV spectra of the standard and that of the formulations were comparable in respect of Z-guggulsterone.The method was found suitable for evaluation of Z-guggulsterone in presence of other phytochemicals present in formulations.

60th Indian Pharmaceutical Congress PA-202 (2008). HPTLC of 6-gingerol and 3-acetyl-11-keto-beta-boswellic acid on silica gel with n-hexane - ethyl actate 7:3 in a chamber saturated at ambient temperature. Quantitative determination by absorbance measurement at 254 nm. The hRf values were 48 and 58 for 3-acetyl-11-keto-beta-boswellic acid and 6-gingerol respectively. The recovery was 98.7-100.8 % for both compounds. The chromatographic conditions were suitable for routine analysis.

J. Chinese Pharm. Standard 10 (4), 284-286 (2009). TLC of Naolibao pill extracts on silica with n-hexane - ethyl acetate 5:1. Qualitative identification by detection under UV 254 nm and 365 nm. The method is simple, rapid, reliable, and suitable for the quality control of the TCM formulation.

Research J. Pharm. and Tech. 3(2), 559-561 (2010). TLC on silica gel with toluene - acetonitrile - formic acid 50:50:3 with chamber saturation for 30 min. The hRf value was 27 for perindopril and 55 for losartan. Densitometric evaluation at 212 nm. The method was linear in the range of 5-30 µg/band and 1-10 µg/band for losartan and perindopril respectively. The average recovery was 98.2-99.9 %.

J. Trad. Chinese Veterinary Med. (5), 53-55 (2010). TLC on silica gel with acetone – ethanol – hydrochloric acid 10:6:1. Detection by spraying with bismuth potassium iodide – 1 % FeCl3 in ethanol 5:1 and heating at 100 ºC. Quantitative determination of stachydrine by absorbance measurement at 510 nm. The precision was 3.7 %RSD within plate (n=8), and the stability of the measurement within 120 minutes was 4.5 %RSD (n=5). The linearity range was 3.2-38.3 µg/zone (r=0.997, n=6) and standard addition recovery was 96.6 % (RSD=2.0 %, n=6).

Chinese J. of Heilongjiang Med. 26 (2), 189-190 (2013). Fufang Niaoweoan Diyanye eye drops, i.e. allantoin/vitamin B6/vitamin E/aminoethylsulfonic acid eye drops, are used for treating eye fatigue and dry eye syndrome. For quality control, semiquantitative determination of taurine, the main active ingredient, by TLC on silica gel with n-butanol – ethanol – water – glacial acetic acid 3:1:1:1, detection by spraying with ninhydrin – ethanol 1:1000 and viewing in daylight. Semi-quantification by comparison of the area size and color of the target zone with the standard taurine. The LOD was around 100 ng/zone. The influences of temperature, acidic, alkaline and oxidizing conditions were studied.

J. Chromatogr. Sci. 54 (1), 79-87 (2016). Determination of either linagliptin (LGP), saxagliptin (SGP) or vildagliptin (VGP) in their binary mixtures with metformin (MET) in pharmaceutical preparations by HPTLC on silica gel with methanol – 0.5 % aqueous ammonium sulfate 4:1. Densitometric evaluation at 225 nm for the LGP/MET mixture and at 208 nm for the SGP/MET and VGP/MET mixtures. The linearity was between 50-500 ng/zone for LGP and SGP, 0.2-2 µg/zone for VGP and 5-40 µg/zone for MET, respectively. The relative standard deviation for intra- and interday precision were within 2 %.