J. Planar Chromatogr. 28, 426-435 (2015). HPTLC of methyl 4-hydroxybenzoate, ethyl 4-hydroxybenzoate, propyl 4-hydroxybenzoate and butyl 4-hydroxybenzoate on silica gel with petroleum ether - acetic acid 20:3. Quantitative determination by absorbance measurement at 254 nm. The influence of experimental settings on densitometric evaluation using the TLC Scanner 4 was investigated to assess the impact on signal intensities, peak shape/resolution and quantitative results. Peak positions can shift for up to 0.5 mm for fast scan speeds. For improved quantitative results the scan slit length should be set to 75 % of the band length, the scan speed to 5 or 10 mm/s and data resolution to 25 or 50 μm/step. The resolution mode of the optical system provided higher signal intensities compared to the light mode. Peak broadening was observed for higher scan speeds, whereby the signal height decreased significantly, if compared to the peak area evaluations. The effects of the instrumental settings on the signal intensity were less pronounced for the evaluations via peak area. Hence, peak area evaluations were more robust with regard to the changed settings.

Proceedings of Sino/West German Symposium on Chromatography, Science Press, Beijing China, 602-617 (1983). TLC of 2,4-DNPH derivatives of 12 aldehydes and ketones on silica with a) tetrachloromethane - hexane - ethyl acetate 10:2:1, b) hexane - ethyl acetate - ethanol 87:12:1 and two-dimensional TLC of 2,4-DNPH derivatives on silica with different solvent systems.

Acta Alimentaria 17, 283-289 (1988). TLC of 2,4-DNPH-one derivatives of aliphatic monocarbonyls on silica or aluminium oxide with benzene - hexane 1:1 and chloroform - cyclohexane - ethyl acetate 10:2:1. TLC of 2,4-DNPH-one derivatives of aromatic monocarbonyls on silica with petrol ether (60-80°C) - benzene - ethyl acetate 2:1:1, TLC of 2,4-DNPH-one derivatives of other carbonyls on silica with toluene - ethyl acetate 3:1 or 1:1. Visualization by spraying with 5% ethanolic solution of KOH.

Chinese J. Hosp. Pharm. (Zhongguo Yiyuan Yaoxue Zazhi) 12, 202-203 (1992). TLC of hydroquinone diacetate on silica with toluene - ether 4:1. Quantification by densitometry at 375 nm.

Planta Medica 82, 09/10, 888-896 (2016). Preparative TLC on silica gel 1) to purify wortmin (from the sclerotiorin group of metabolites) from an apolar fraction of an ethyl acetate extract of Talaromyces tratensis KUFA 0091, developed with chloroform – petroleum ether – ethyl acetate 8:1:1; 2) to isolate tratenopyrone (new isocoumarin derivative) from a subfraction of the same extract, developed with chloroform – acetone – formic acid 10:10:1; 3) to isolate circinophoric acid (new diphenyl ether derivative) from a fraction of an ethyl acetate extract of Sporidesmium circinophorum KUFA 0043, developed with chloroform – acetone – formic acid 60:40:1. The yields calculated from the raw extracts were 512 ppm, 406 ppm and 224 ppm, respectively.

nauk. SSSR, serija chimicheskaja 2079-2084 (1983). (Russian). (Synthesis of 1-halo-1-(acylamino)alkanones-2.) TLC on silica with a) acetone - ethanol 3:1, b) ethyl acetate - benzene 2:3, 1:5, 1:4; c) ethanol, d) ethyl acetate, e) acetone, f) ether. Detection with iodine vapors or by UV.

Planta Med. 55, 127-132 (1989). TLC of lactones (eupatoriopicrin) on silica with chloroform - acetone 3:1. TLC of flavonoids and phenolic acids (rutoside, hyperroside, quercetin, caffeic and chlorogenic acid) on silica with ethyl acetate - acetone - formic acid - water 5:3:1:1. Detection with Neu’s reagent and under UV 365 nm. TLC of alcoholic acids (malic acid) on silica with toluene - ethyl formate - formic acid 5:4:1. Detection with Schwepp’s reagent and heating at 110°C.

Chinese J. Plant Physiol. (Zhiwu Shenglixue Tongxun) 28, 288-290 (1992). TLC of malonaldehyde on silica with butanol - dichloromethane - water 40:20:1. Detection by spraying with thiobarbituric acid. Quantification by densitometry at 530 nm.