Chinese J. of Pharm. Anal. 29 (9), 1458-1461 (2009). TLC of Ershiwuwei Luronghao pill extracts on silica gel with toluene - ethyl acetate - water - formic acid 20:10:1:1. Detection under UV 365 nm. Identification of aristolochic acid A by comparison of the hRf value with the standard. The method was rapid and precise and suitable for the quality control of the medicine.

J. Planar Chromatogr. 26, 132-136 (2013). TLC of rosmarinic (1) and caffeic acids (2) in extracts of Salvia species on silica gel with toluene - ethyl acetate - formic acid 5:4:1. Quantitative determination by absorbance measurement at 325 nm. The hRf values for (1) and (2) were 40 and 60, respectively.

J. Planar Chromatogr. 30, 411-417 (2017). HPTLC of paraben solutions and a complex matrix such as honey spiked with 5-hydroxymethylfurfural to study the influence of different application parameters on quantitative analysis. The investigated parameters included application geometries (spot, band and area) and their respective application modes (contact and spray-on), various dosage speeds, different band lengths, overspotted application versus application of mixture solutions as well as influence of the dosing volume on the result. These parameters have influence on method development and validation results.

J. Chromatogr. 331, 202-203 (1985). TLC of citrazinic acid on silica with propanol NH3 2:1.. Detection by spraying with p-dimethylaminobenzaldehyde reagent, and heating at 125°C for 1-2 min. Detection limit 200 ng.

J. Liquid Chrom. 9, 3473-3478 (1986). TLC separation of p-hydroxy phenylacetic acid, m- and p-hydroxybenzoic acid, vanillic, salicylic and syringic acid, p-hydroxybenzaldehyde, vanillin and salicylaldehyde on silica and Fe(NO3)3-impregnated silica with 11 solvent systems. Detection on plain plates by spraying with methanolic FeCI3 solution (1 %) or saturated solution of o-dianisidine in acetic acid or by UV absorbance. Differences between Rf values (on plain and on impregnated silica) can be used as one of the parameters in the identification of some phenolic aldehydes or acids.

Structure of leiocarposide. Pharmazie 43, 278-279 (1988). TLC of a new benzoic acid derivative, leiocarpic acid (3,6-dihydroxy-2- methoxy-benzoic acid) on silica with n-hexane - ether 1:1 or chloroform - methanol - water 6:4:1 or chloroform - acetone - formic acid 80:20:5. Detection by spraying with SbCl3-SbCl5 reagent.

J. Pharm. Biomed. Anal. 5, 665-673 (1987). Description of a TLC method for enantiomeric separation of chiral carboxylic acids using chiral derivatization and non-chiral TLC conditions to separate diastereomeric carboxamides using „levobase“, (1R, 2R)- (-)-1- (4-nitrophenyl)-2-amino-1, 3-propanediol, and „dextrobase“; the enantiomers of levobase, as chiral derivatizing agents for carboxamide formation in the presence of dicyclohexylcarbodiimide as coupling agent. Good resolution was obtained for a wide range of carboxylic acid enantiomeric pairs containing 1 to 2 chiral centers .

TLC of lupulons, humulons, xanthohumol, chlorophyll on silica with cyclohexane – ethyl acetate – propionic acid 60:38:2. Detection under UV 365 nm. IR spectra after extraction with methanol.