Microbiol. Res. 268, 127295 (2023). HPTLC of melanin produced by Streptomyces sp. strain MR28 on silica gel with ethanol - 75 % butanol - water 1:4:1. Detection by exposure to iodine vapor. The hRF value for melanin was 68.

Food Chem. 362, 130132 (2021). HPTLC of betanin (1) and vulgaxanthin I (2) in beetroot (Beta vulgaris L. subsp. vulgaris) on RP-18 silica gel with water - acetonitrile -  trifluoroacetic acid 40:10:1. Quantitative determination by absorbance measurement at 535 nm for (1) and 484 nm for (2). The hRF values for (1) and (2) were 38 and 58, respectively.

J. Liq. Chromatogr. Relat. Technol. 43, 233-246 (2020). HPTLC of lutein (1) and lactucaxanthin (2) in three varieties of lettuce (Iceberg, Romania, and green lettuce) on silica gel with heptane - acetone 7:3. The hRF values for (1) and (2) were 44 and 41, respectively.

J. Planar Chromatogr. 33, 11-18 (2020). HPTLC of lutein in dietary supplements on silica gel with n-heptane – ethyl acetate 9:1. The part of the TLC chromatogram containing the zone visible in day light was cut off, followed by developing in the opposite direction with n-heptane – acetone – ethyl acetate 11:5:4. Quantitative determination by absorbance measurement at 450 nm. Linearity was between 90 and 500 ng/zone for lutein. Intermediate precisions were below 2 % (n=9). The LOD and LOQ were 50 and 90 ng/zone, respectively. Recovery rate was between 87 and 102 %.

J. Planar Chromatogr. 23, 219-224 (2010). TLC of carotenoids (lutein, beta-carotene), astaxanthin and tannin on silica gel with petroleum ether - diethyl ether - acetone 15:3:2 in a twin-trough chamber saturated for 30 min at room temperature. Quantitative determination by densitometric absorbance measurement at 450 nm. The hRf values of lutein in tea, mulberry, and cassava leaf were 19, 22, and 19 and corresponded to lutein standard. The least polar zone had an average hRf value of 98, 98, and 96 for tea, mulberry, and cassava leaf, respectively, and was identical with beta-carotene standard.

J. Chromatogr. A 1572, 137-144 (2018). Development of a method for the analysis of anthocyanes within the foodstuffs of plant origin by TLC on RP-18 phase (which ensures mixed-mode retention mechanism with the localized adsorption on the non-bonded silanols) with acetic acid as the mobile phase component, using two anthocyanins (cyanin and keracyanin) and two anthocyanidins (pelargonidin and delphinidin) as phytochemical standards. By triple development, distinct and symmetrically shaped chromatographic zones were obtained. Further analysis of the products of hydrolytic degradation of the test anthocyanins by MS. Identification of the hydrolytically split fractions by using the p-aminobenzoic acid reagent. Investigation of the calibration curves for cyanin, keracyanin, pelargonidin and delphinidin, and the respective LOD and LOQ values. Application of the method to identify and quantify cyanin, keracyanin, pelargonidin and delphinidin in selected alimentary products (syrups, juices and herbal infusions).

alba. Planta 174, 59-66 (1988). TLC of geraniol, farnesol, geranylgeraniol and prephytoene alcohol on silica with ethyl acetate - conc. NH3 - isopropanol 3:3:4 on silica impregnated with 5% paraffin in petrol ether (60-80°C) with methanol - water 80:20 saturated with paraffin. The bands were located with a spark chamber, eluted and radioassayed.

J. Planar Chromatogr. 5, 343-349 (1992). Comparison of the TLC separation of chloroplast pigments on silica and 7 types of bonded silica plates; best overall separation was found on RP-18 silica using the solvent system petrol ether (35-60°C) - acetonitrile - methanol 2:4:4. Identification with Rf values, chemical reaction with hydrochloric acid and in situ spectra; Quantification by densitometry.