Food Chem. 210, 613-622 (2016). HPTLC fingerprinting of triterpenoids in Siam and Sumatra benzoin balsams on silica gel with n-hexane – methanol – acetic acid 8:2:1. Detection by dipping into anisaldehyde sulfuric acid reagent for 1 s (10 mL of sulfuric acid were carefully added to an ice-cold solution of 170 mL methanol and 20 mL acetic acid, followed by the addition of 1 mL of anisaldehyde (p-methoxybenzaldehyde)), followed by heating at 105 °C for 5 min. Qualitative identification under UV 366 nm. Two specific compounds at approximately hRF 5 (violet band) and 50 (beige band) were detected in the Sumatra sample. Siam benzoin is characterized by two specific compounds at approximately hRF 5 and 10 (brown bands) and two others at approximately hRF 20 and 60 (orange bands).

Food Control. 71, 234-241 (2017). HPTLC of residual aflatoxin B1 after biological detoxification on silica gel with chloroform – ethyl acetate 4:1. Quantitative determination by absorbance measurement at 365 nm.

J. Planar Chromatogr. 29, 306-309 (2016). HPTLC of some red, rose, and white wines on silica gel with ethyl acetate – acetic acid – formic acid – water 10:1:1:2. Antioxidant activity determination by dipping into a 0.04 M methanolic 2,2-diphenyl-1-picrylhydrazyl (DPPH radical reagent) solution (1) and into a 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) solution (2; prepared by mixing 7 mM ABTS diammonium salt solution with 2.45 mM potassium persulfate solution 1:1). The plates were then dried in the fume hood and stored in the dark. The antioxidant activities were determined after 10 and 30 min reaction time. Method (2) was more sensitive than the DPPH assay.

J. Liq. Chromatogr. Relat. Technol. 39, 698-701 (2016). HPTLC of resveratrol and saponins in syrup, powdered trunk, and bark samples of Yucca schidigera on silica gel with chloroform - methanol - water 35:14:1. Detection by spraying with 10 % sulfuric acid - ethanol solution followed by heating at 100 ºC. Qualitative identification at 254 nm. The hRF values for phenols were >38, where these were <38 for saponins.

J. Agric. Food Chem. 64, 8838-8847 (2016). HPTLC of free fatty acids produced after treatment of vegetable oils with crude lipase extracts from germinated seeds of Adansonia suarezensis, Adansonia grandidieri, Moringa oleifera, Moringa drouhardii, Jatropha mahafalensis, and Jatropha curcas seeds on silica gel with hexane – diethyl ether – acetic acid 70:30:1. The hRF value of free fatty acid was 43.

J. Planar Chromatogr. 29, 429-434 (2016). HPTLC of chlorpyrifos (1) insecticide and its metabolite 3,5,6-trichloropyridinol (2) in visceral samples on silica gel with n-heptane – acetone 1:1. Quantitative determination by absorbance measurement at 300 nm. The hRF values for (1) and (2) were 64 and 54, respectively. Linearities were between 0.5 and 4 μg/zone for (1) and 0.05 and 0.4 μg/zone for (2). The intermediate precisions were below 2.9 % (n=3). The LOQs were 1.5 μg/zone for (1) and 0.15 μg/zone for (2). Recoveries ranged between 84 and 91 % for (1) and 80 and 93 % for (2).

J. Ethnopharmacol. 197, 10-24 (2017). Review of various aspects for the quality control of Ayurvedic herbs, including standardization, chemical-profiling and metabolite fingerprinting. A comprehensive table with important parameters for quality evaluation of Ayurvedic medicine was presented, including TLC and HPTLC profile with markers.

J. Planar Chromatogr. 30, 271-274 (2017). HPTLC of the synthetic pyrethroids cypermethrin, deltamethrin, and λ-cyhalothrin on silica gel with n-hexane – acetone 4:1. Detection by spraying with freshly prepared hydralazine solution (37.5 mg in 50 mL 2N sodium hydroxide solution). The hRF value for α-cyano ester pyrethroids was 57.