(Hungarian) (The connection of retarded growth with endogenous gibberellin level in bean plants treated with chlorcholinechloride, CCC). TLC of gibberellin on silica with isopropyl ether - acetic acid 95:5.

J.A.O.A.C. 67, 40-43 (1984). TLC of deoxynivalenol (DON; 3,7,15 - trihydroxy-12,13-epytrichothec-9-en-8-one) on silica, impregnated with 15 % AlCl3-solution, with chloroform - acetone - isopropanol 8:1:1. Detection by heating the plate at 120 °C for 7 min. and by UV 365 nm.

Proc. 6th Int. Symp. Instrum. Planar Chromatogr., (Interlaken 1991), Inst. Chromatogr., Bad Dürkheim, FRG, 175-183 (1991). Influence of several parameters on the chromatographic behavior of penicillins are tested by OPLC on silica impregnated with tricaprylmethylammonium chloride (TCMA) with methanol - water 3:7. Discussion of the use of an ion-pairing reagent (cetrimide) on TCMA-impregnated layers.

Sz. Nyiredy, A. Kakuk (eds.): Planar Chromatography 2000, Lillafüred, Hungary, 24-26 June 2000, Res. Inst. for Med. Plants, p. 159-169. HPTLC of tetracyclines on silica gel (with concentration zone, impregnated with 5% aqueous Na2EDTA solution) with the lower layer of chloroform - methanol - 5% aqueous Na2EDTA solution 13:4:1 after a pre-development with n-hexane and acetone to remove lipid fractions. Detection of fluorescent spots at 254 and 366 nm. Detection limit is found to be 0,1 µg (twofold development with mobile phase). At 0,05 µg level tetracycline and chlorotetracycline migrate together.

J. Chromatogr. A 1216 (42), 7102-7107 (2009). HPTLC of co-trimoxazole tablets (combination of sulfamethoxazole and trimethoprim) on silica gel with toluene – ethyl acetate – methanol 100:57:43. Detection under UV 254 nm. The hRf values were 30 and 61 for trimethoprime and sulfamethoxazole, respectively. Quantification by densitometry at UV 254 nm. Cochran's criterion test indicated homoscedasticity of variances for the calibration data. The F-tests for lack-of-fit indicated that straight lines were adequate to describe the relationship between spot areas and concentrations for each compound. Repeatability and precision (%RSD) was 1.0 and 0.8 % for sulfamethoxazole as well as 1.3 % and 1.6 % for trimethoprim, respectively. Recovery was 99.0 % and 99.7 % for sulfamethoxazole and trimethoprim, respectively.

J. Planar Chromatogr. 24, 534-538 (2011). HPTLC of clarithromycin in plasma on silica gel (prewashed with methanol) with ethyl acetate - methanol - 15 % ammonium acetate (pH 10.6) 7:2:1 in a twin-trough chamber with saturation for 15 min. Detection by dipping into xanthydrol solution (10 % in methanol). Quantitative determination by densitometry in absorbance mode at 506 nm. The hRf was 62. The method was linear over the range of 0.1-3.0 µg/mL (r2 = 0.9974). The recovery (by standard addition) was over 85 %. The intra-day and inter-day precision (%RSD) of the assay was in the range of 0.8-4.6 %. The recovery was above 95 %.

J. Planar Chromatogr. 27, 47-51 (2014). HPTLC of clotrimazole in vaginal tablets on silica gel with toluene - acetone 3:2. Quantitative determination by absorbance measurement at 215 nm. The hRF value for clotrimazole was 27. Linearity was in the range of 1000-2400 ng/zone. The intermediate/interday/intra-day precisions were below 1.3 % (n=6). Recovery was between 99.1 and 100.1 %.

Malaria J. 15, 215 (2016). TLC of methanol extracted tablets and the standards sulfadoxine and pyrimethamine with the GPHF Minilab (procedure for sulfadoxine) on silica gel with ethyl acetate – methanol 3:1 for approximately 15 min. Detection under UV 254 nm, and by exposure to iodine vapor. Documentation with a commercial digital camera. For comparison to authentic paracetamol and co-trimoxazole samples, the GPHF Minilab solvent systems for paracetamol (acetone – toluene – acetic acid 20:20:1), pyrimethamine (ethyl acetate – methanol – acetone – conc. aqueous ammonia 24:12:4:1) and co-trimoxazole (ethyl acetate – methanol 3:1) were used. 28 market samples were collected and analyzed, 10 samples were further analyzed by HPLC according to the USP. One sample was falsified, the box contained a mixture of paracetamol tablets and co-trimoxazole tablets and none of the tablets contained any anti-malarial drugs.