Food Chem. 221, 1232-1244 (2017). Review of novel analytical methods for the detection of milk adulterants, including the use of RP-TLC for the determination of vegetable oils as adulterant of fat content. In this methodology, vegetable oil content was quantified by monitoring the structure of sterols by using β-sitosterol as a marker.

J. Ethnopharmacol. 193, 490-499 (2016). HPTLC of quercetin in the leaves of Ocimum basilicum on silica gel with toluene – ethyl acetate – formic acid 17:11:2. Quantitative determination by absorbance measurement at 254 nm.

J. Planar Chromatogr. 29, 372-379 (2016). HPTLC of vitamin E (1) and vinpocetine (2) in its alkaline-induced degradation product (3) on silica gel with methanol – chloroform – ethyl acetate – glacial acetic acid – ammonia 60:20:20:5:1. Quantitative determination by absorbance measurement at 235 nm. The hRF values for (1) to (3) were 81, 62 and 41, respectively. Linearities were between 0.2-2 µg/zone for (1), 0.1-1.5 µg/zone for (2) and 0.1-1 µg/zone for (3). The intermediate precisions were below 0.7 % (n=3). The LODs and LOQs were 67 and 198 ng/zone for (1), 32 and 98 ng/zone for (2) and 29 and 87 ng/zone for (3). Average recoveries were 99.6 % for (1), 100.0 % for (2) and 99.9 % for (3). The results were statistically compared with those obtained by a HPLC method and no significant differences were found.

J. Planar Chromatogr. 30, 216-218 (2017). HPTLC of monocrotophos on silica gel with n-hexane – acetone 4:1. Detection by spraying with freshly prepared sodium nitroprusside reagent (1 % sodium nitroprusside in 2 N sodium hydroxide). The hRF value for monocrotophos was 80.

Food Chem. 239, 848-857 (2018). HPTLC of lipids in raw milk on silica gel with n-hexane – diethyl ether – acetic acid 85:15:2. Detection by spraying with phosphomolybdic acid in ethanol. Quantitative determination by absorbance measurement at 650 nm. The identified peaks corresponded to phospholipids, 1,3-diglycerols, 1,2-diglycerols, sterols, free fatty acids and triacylglycerols.

J. Chil. Chem. Soc. 62, 3435-3437 (2017). HPTLC of deoxynivalenol in wheat crop samples on silica gel with toluene – ethyl acetate – formic acid 6:3:1. Detection by spraying with 10 % aluminium chloride in ethanol – water 1:1, followed by heating at 120 °C for 10 min. Quantitative determination by fluorescence measurement at UV 366/>400 nm. The identity and purity of zones were confirmed by direct mass spectrometry on the plate using a TLC/MS elution head-based interface. Linearity was between 8-120 ng/zone. LOD and LOQ were 0.05 and 0.19 mg/kg, respectively. Average recovery rate was 90.1 %.

J. Planar Chromatogr. 30, 313-322 (2017). HPTLC of cyclobenzaprine hydrochloride (1) and asenapine maleate (2) on silica gel with toluene ‒ methanol ‒ chloroform ‒ ammonia solution 33 % 50:30:60:1. Quantitative determination under UV light at 290 and 220 nm for (1) and (2), respectively. The hRF values for (1) and (2) were 45 and 75, respectively. Linearity was between 5 and 50 μg/zone for (1) and (2). The intermediate precision (n=2) was <2 %. The LOD and LOQ for (1) were 1.3 and 4.4 μg/zone for (1) and 1.2 and 3.9 μg/zone for (2), respectively. Average recovery rate was 99.2 % for (1) and 99.7 % for (2). There were no significant differences between the mean percentage recoveries and the precisions compared with a validated HPLC mehod.

J. Planar Chromatogr. 30, 363-374 (2017). HPTLC of acetylsalicylic acid (1) and its related compound salicylic acid (2) on silica gel with n-hexane – diethyl ether – 80 % acetic acid 7:2:1. Good quality densitograms with well separated and symmetric peaks of (1) and (2) were achieved. Detection with the following reagents: Janus blue, bromophenol blue, bromocresol blue, hydrogen peroxide (without heating and with heating to 90 °C during 60 min), 1 % sodium hydroxide (with heating to 45 °C and also with heating to 90 °C during 60 min), brilliant green, malachite green, and thymol blue.