CBS 83, 12-13 (1999) HPTLC of levamisol in pig tissue on silica gel with chloroform over a developing distance of 70 mm, then with chloroform - methanol - formic acid 400:50:1 over 50 mm. Quantitative determination by absorbance measurement at 220 nm. Limits of detection are 0.6 - 1.5 µg/kg.

J. Planar Chromatogr. 17, 369-371 (2004). TLC of 9-phenylxanthene derivatives (fluorescein, erythrosine, eosin, rhodamine B, and their allyloxy-derivatives) on silica gel with benzene - methanol 5:1, toluene - ethanol 7:1, acetontrile - water 7:1, toluene - ethyl acetate - methanol 1:5:2. Detection under UV light at 254 nm or with iodine vapor. Quantitation by densitometric scanning.

J. AOAC Int. 88, 1568-1570 (2005). HPTLC of alliin on silica gel with n-butanol - acetic acid - water 3:1:1 at 25 +/- 2 °C and 40 % relative humidity. Detection by dipping in ninhydrin reagent (0.3 g ninhydrin in 100 mL n-butanol and 3 mL acetic acid) for 2 s, followed by heating at 110 °C for 5 min. Quantitative determination by densitometric evaluation of peak areas at 540 nm. Linearity within the range of 250-1500 ng/spot, correlation coefficient of 0.998 and RSD of 2.87 %; mean recovery 98.4 %.

Acta Chrom. 6, 7-12 (1996). HPTLC of fructose, glucose and sucrose on silica gel with concentration zone. Impregnation of the layer (except concentration zone) by spraying with 0.1 M sodium bisulfate solution, followed by drying and spraying with citrate buffer of pH 4.8. Three-fold development with acetonitrile - deionized water 17:3 after chamber saturation. Visualization by spraying with 1-naphthol - sulfuric acid reagent and heating at 110 °C. Quantification by densitometry at 515 nm.

J. Planar Chromatogr. 20, 57-60 (2007). TLC of 5-methylcytosine, tryptamine, melatonin, tryptophan, indole-3-acetic acid, and indole on silica gel with 1-butanol - glacial acetic acid - water 12:3:5 and isopropanol - 25 % ammonia - water 8:1:1. Densitometry at 280 nm.

J. Chromatogr. A 1188 (2), 295-300 (2008). Determination of food dyes (tartrazine, azorubine and sunset yellow) in different products by HPTLC combined with image processing of scanned chromatograms, on 3-aminopropyl modified silica gel with isopropanol - diethyl ether - ammonia 2:2:1. Quantification by using digital processing of images with special-purpose software. The limit of detection was between 5 and 9 ng/spot and the limit of quantification was between 10 and 18 ng/spot. Recovery was between 96.4 and 102.7 %.

J. Food Comp. Anal. 21, 577-581 (2008). HPTLC of a novel fluorescent compound of nutmeg (Myristica fragrance) on silica gel with hexane – diethyl eter – acetic acid 50:50:1. Detection under UV at 265 nm or by spraying with sulphuric acid 50% followed by heating at 180 °C. The major fluorescent band at hRf 63 was further purified on silica gel using dioxane – acetonitrile – acetic acid 70:30:1. The hRf value of the novel compound was 61. Quantitative determination by absorbance measurement at 376 nm. Linearity was between 1 to 50 µg/spot. The compound was identified as 2-methyl-1,4,4a,8a-tetrahydro-endo-1,4-methanonaphthalene-5,8-dione.

J. Planar Chromatogr. 22, 59-63 (2009). HPTLC of paraquat, diquat, difenzoquat, mepiquat, and chloromequat on LiChrospher silica gel with 1-propanol - methanol - 2.5 M aqueous sodium chloride 1:1:3. Detection by immersion for 2 s in a solution of 50 mg sodium tetraphenyl borate in 50 mL of water containing 50 µL concentrated hydrochloric acid. The wet plate was illuminated for 5 min with UV light at 254 nm which resulted in the formation of fluorescing spots corresponding to mepiquat, chloromequat, and difenzoquat. Immediately after illuminating at 254 nm all spots were illuminated for 10 min with UV light at 365 nm, which converted all compounds into fluorescent derivatives. Then the dry plate was dipped into ethylene glycol - methanol 1:1 for 2 s, which enhanced the fluorescence by a factor of two. Detection by fluorescence measurement and averaged densitograms were obtained in the emission wavelength range from 440 to 480 nm.