J. Planar Chromatogr. 32, 149-156 (2019). HPTLC of ondansetron (1) and pantoprazole (2) in pure forms and normal saline intravenous infusions on silica gel with chloroform - methanol - ethyl acetate 3:1:1. Quantitative determination by absorbance measurement at 302 nm. The hRF values for (1) and (2) were 50 and 73, respectively. Linearity was between 30 and 1000 ng/zone for (1) and 50 and 1000 ng/zone for (2). The intermediate precision was below 2 % (n=3). The LOD and LOQ were 8 and 23 ng/zone for (1) and 16 and 47 ng/zone for (2), respectively. Recovery rate was 99.8 % for (1) and 99.9 % for (2).

J. Planar Chromatogr. 32, 133-140 (2019). HPTLC of granisetron (1), aprepitant (2) and deflazacort (3) in drug products and spiked plasma on silica gel with chloroform - methanol - formic acid 36:3:2. Quantitative determination by absorbance measurement at 200 nm. The hRF values for (1) to (3) were 12, 45 and 58, respectivley. Linearity ranged 0.1-2.0 µg/zone for (1) and (3) and 0.2-4.0 µg/zone for (2). The intermediate precision was below 1.4 % (n=3). The LOD and LOQ were 27 and 82 ng/zone for (1), 48 and 140 ng/zone for (2) and 31 and 94 ng/zone for (3), respectively. Recovery rate was 99.9 % for (1) and (2) and 99.7 % for (3). 

J. Planar Chromatogr. 32, 127-131 (2019). HPTLC of paracetamol (1), chlorpheniramine maleate (2) and pseudoephedrine (3) on silica gel with methanol - toluene - acetic acid 44:16:1. Quantitative determination by absorbance measurement at 254 nm. The hRF values for (1) to (3) were 81, 10 and 71, respectively. Linearity was between 50-600 µg/zone for (1), 1-30 µg/zone for (2) and 10-35 µg/zone for (3). The intermediate precision was below 2 % (n=3). The LOD and LOQ were 20 and 49 µg/zone for (1) [Editor´s note: LOD should be <200 ng/zone.], 0.07 and 0.43 µg/zone for (2) and 0.31 and 0.96 µg/zone for (3), respectively. Recovery rate was 99.7 % for (1), 101.6 % for (2) and 99.7 % for (3).

J. Planar Chromatogr. 19, 454-462 (2006). HPTLC of enrofloxazine, norfloxazine, oxytetracycline, trimethoprim, sulfamethazine, sulfadiazine, and penicillin G/procaine on cyano phase with 0.05 M oxalic acid - methanol 81:19. Evaluation under UV light at 254 and 366 nm. Quantitative determination of TMP by absorbance measurement at 254 nm, and fluorescence measurement at 366 nm for the other compounds. The SPE-TLC determination was validated for linearity, precision, quantification, and detection limit.

J. Liq. Chromatogr. Relat. Technol. 28, 2195-2209 (2005). HPTLC of 5’-carbamates of zidovudine (3’-azido-3’-deoxythymidine) and thymidine on RP-18 with methanol - buffer pH 7.4 mixtures with methanol contents between 30 and 80 %; or acetone - buffer mixtures with modifier contents between 20 and 80 % in 5 or 10 % increments. Detection after drying at 40°C developed under UV radiation.

J. Liq. Chromatogr. Relat. Technol. 29, 2019-2033 (2006). HPTLC of twelve 3,5-dioxo-4-azatricyclo[5.2.2.02,6]undecanes on RP-18 W and RP-18 in horizontal chambers. Mobile phases were prepared by mixing the respective amounts of water and polar modifiers (methanol, dioxane, acetone) in the range from 50 - 75 or 90 % for RP, and 40, 50 - 65, or 75 % for RP W-plates. Evaluation under UV 254 nm.

J. Liq. Chromatogr. Relat. Technol. 29, 2071-2082 (2006). TLC of S-(+)-naproxen on silica gel (prewashed with methanol - water 9:1 and impregnated with a 0.03 mol/L solution of L-arginine in methanol by dipping for 2 s at 22 +/- 2 °C) with acetonitrile - methanol - water 5:1:1.5 containing several drops of acetic acid to fix the pH at 4.8; and two-dimensional development with acetontrile - methanol - water 10:2:3. Densitometric evaluation at 235 nm.

J. of China Pharm. 23 (20), 38-40 (2014). Nicotine is a toxic substance in tobacco. Studies have shown that nicotine may prevent and treat Alzheimer's disease (AD) and Parkinson's syndrome (PD). At present, the most effective method to treat AD is by inhibiting the activity of acetylcholinesterase (AChE), thus enhancing the cholinergic activity indirectly. In order to clarify the mechanism of nicotine reducing the incidence of AD, the activity of natural AChE inhibitors in Xinjiang Mohe tobacco was screened by TLC on silica gel with (A) ethyl acetate – methanol – ammonium hydroxide 70:30:1, followed by detection via enzyme inhibition (this is not bioautography, as stated in the title): firstly by spraying with 1.0 U/mL AChE (AChE 500 U + tris-HCl buffer solution of pH 7.8 500 mL + bovine serum albumin 500 mg), followed with 1.5 g/L alpha-naphthyl acetate (150 mg in ethanol 40 mL + water 60 mL) and then with 0.5 g/L Fast blue B salt, resulting in white zones on purple background; (B) toluene – ethyl acetate - diethylamine 7:2:1, detection by spraying with 0.2 mmol/L 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical reagent, resulting in white to yellow zones on pale purple background. The results indicated that nicotine in Xinjiang Mohe tobacco could bind to AChE and thus inhibit its activity.