J. Chil. Chem. Soc. 58, 1663-1666 (2013). HPTLC of rosiglitazone (1) and glimepiride (2) in tablet dosage form on silica gel with methanol - toluene - ethyl acetate 1:8:1. Quantitative determination by absorbance measurement at 228 nm. The hRf values for (1) and (2) were 39 and 20, respectively. Linearity was in the range of 100-1500 ng/zone for (1) and 100-1500 ng/zone for (2). LOD and LOQ were 30 and 35 ng/zone for (1) and 85 and 90 ng/zone for (2), respectively. Recovery was 96 % for (1) and (2). Intermediate intra- and inter-day precision was below 2 % (n=6).

Saturated heterocycles, 51. Synthesis of stereoisomeric 1,3- thiazines with condensed skeleton. Acta Chimica 118, 37-42 (1985). TLC of cis- and trans-4,5- tetramethylene-4,5- dihydro-6H-1,3-thiazines on silica with butanol - ether - acetic acid 1 0:10:1.

J. Chromatogr. 429, 95-121 (1988). A section of the review related to analysis of pterins (10 references).

J. Planar Chromatogr. 6, 117-120 (1993). TLC of 16 heterocyclic nitrogen compounds on RP-2, RP-8, and RP-18 silica with methanol water mixtures; detection under UV or visualization with Dragendorff’s reagent.

Detection under UV 254 nm. Quantification by UV spectrophotometry at 240 nm.

Anal. Bioanal. Chem. 387, 1083-1093 (2007). A new HPTLC method for trace analysis (low µg/kg range) of the five heterocyclic aromatic amines PhIP (2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine), MeIQx (2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline), 4,8-DiMeIQx (2-amino-3,4,8-trimethylimidazo[4,5-f]quinoxaline), norharmane (9H-pyrido[3,4-b]indole) and harmane (1-methyl-9H-pyrido[3,4-b]indole) in meat samples has been established. HPTLC on LiChrospher silica gel WRF with methanol – chloroform 1:9. Using the ADC2, the plate activity was adjusted to 34 % relative air humidity with MgCl2 x 6H2O for 15 min and, at the same time, chamber saturation with 35 mL aqueous ammonia 28 % – ultrapure water 1:4 was performed for 20 min, followed by alkaline plate preconditioning for 15 min. The development was performed in a fresh chamber. Quantitative determination by absorbance measurement at UV 262 nm and 316 nm, and fluorescence measurement at UV 366/>400 nm. The UV wavelength 316 nm was later substituted by 313/>340 nm for a more selective and sensitive determination of PhIP in the meat matrix. Mass spectrometric analysis was performed in ESI+ mode for confirmation of positive findings. The method was validated according to ICH guidelines. Repeatability was better than 3.3 % (n=14), the intermediate precision (n=6, peak area) was 0.4 % (PhIP), 0.6 % (MeIQx), 0.7 % (4,8-DiMeIQx), 0.9 % (norharmane) and 1.1 % (harmane). Reproducibility of the migration distance was better than 1.3 % (n=6). LODs were 4 ng/band for PhIP, 5 ng/band for MeIQx, 4 ng/band for 4,8-DiMeIQx, and 0.4 ng/band each for norharmane and harmane. LOQs were 6 ng/band for PhIP, 14 ng/band for MeIQx, 11 ng/band for 4,8-DiMeIQx, and 0.8 ng/band each for norharmane and harmane. Selectivity in the meat matrix was proven. Confirmation of the substances found in meat was performed by MS. In the working range RSDs of the calibration functions were between 1.9 and 3.6 %.

J. Liquid Chromatogr. 6, 2695-2697 (1983). TLC of 15 derivatives of pyrazoline-5-one on silica with a) chloroform - methanol 9:1, b) benzene - ethyl acetate 6:4.

J. Planar Chromatogr. 5, 431-434 (1992). Investigation of the relationships between solute structure and chromatographic behavior of azine and diazines. TLC of 2,2'-bipyrazyl, 2,2'-biquinoxalyl, 2,2'-bipyridyl, 2,2',2'-tripyridyl, quinoline, 2,2'-biquinolyl, 2-methylquinoxaline, 3,3'-dimethyl-2,2'-biquinoxalyl and g,g'-bipicolyl on Kieselguhr impregnated with a 20% solution of formamide in acetone or with solutions of formamide in acetone containing formic acid. Benzene, trichloroethylene, hexane, chloroform, or heptanol were used as monocomponent mobile phases. Visualization with Dragendorff followed by additional spraying with 18 m sulfuric acid.