J. Food Compos. Anal. 102, 104010 (2021). HPTLC of caryatin (1) and 3′-O-methycaryatin (2) in yam landraces covering eight staple food species (Dioscorea spp) on silica gel with toluene - ethyl acetate - formic acid 4:6:1. Detection by spraying with NP reagent. Quantitative determination by absorbance measurement at 366 nm.  

J. Food Compos. Anal. 94, 103610 (2020). HPTLC of chlorogenic acids, including 3-O-caffeoylquinic acid (1), 5-O-caffeoylquinic acid (2), 4-O-caffeoylquinic acid (3), 5-O-feruoylquinic acid (4), 4-O-feruoylquinic acid (5), 3,4-di-O-caffeoylquinic acid (6), 4,5-di-O-caffeoylquinic acid (7), 3,5-di-O-caffeoylquinic acid (8), and caffeic acid (9) in green and roasted coffee beans and their distribution during roasting trials on silica gel with diethyl ether - formic acid - acetic acid - water - acetophenone - heptane 30:3:9:50:30:10. Detection by spraying with Natural product reagent A (1 g NPA in 100 mL methanol). Quantitative determination by absorbance measurement at 366 nm. The hRF values for (1) to (9) were 12, 15, 18, 21, 25, 27, 34, 49 and 80, respectively.   

Food Res. Int. 147, 110455 (2021). HPTLC of extractable and non-extractable polyphenols in peels from different species of the Passifloraceae family on silica gel with ethyl acetate - toluene - formic acid - methanol 15:15:4:1. Detection by spraying with 10 % of sulfuric acid in methanol, followed by heating at 80 °C. Evaluation in UV light at 254 and 366 nm. Further analysis by direct analysis in real-time (DART)-high-resolution mass spectrometry (HRMS) analysis. 

Food Chem. 355, 129555 (2021). HPTLC of phenolic compounds in tea extract on polyamide-precoated plastic plate with methanol - acetone - butanol - acetic acid 5:3:2:1. Detection by spraying with 1 % ferric chloride. Quantitative determination by desorption electrospray ionization mass spectrometry (DESI-MS).

J. Liq. Chromatogr. Relat. Technol. https://doi.org/10.1080/10826076.2021.1932521 (2021). HPTLC of gallic acid in the stem bark of Schinus terebinthifolius on silica gel with toluene - ethyl acetate - formic acid - methanol 15:15:4:1. The plates were scanned at 254 nm and 366 nm. The hRF value for gallic acid was 43. Image features were acquired using a combination of two approaches: Haralick texture features and Zernike moments. The GNU OctaveVR software was used to set the architectures of the Artificial Neural Network. The mathematical data provided by the image analysis was correlated with the gallic acid content determined by HPLC. The method allowed the prediction of phenolic content through TLC plate images.

Anal. Bioanal. Chem. 412, 6789-3809 (2020). HPTLC of Ginkgo biloba extracts on silica gel with ethyl acetate - acetic acid - formic acid - water 100:11:11:26 (1) or toluene - ethyl acetate - formic acid 7:3:1 (2). Detection under UV light at 366 nm or by spraying with  natural product reagent (NPR) and polyethylene glycol (PEG). The method allowed to distinguish between characteristic and uncharacteristic unfinished product samples based on the presence or absence of bands corresponding to caffeic acid, rutin, hyperoside, chlorogenic acid, and genistein standards.

Anal. Bioanal. Chem. 412, 4527-4536 (2020). HPTLC of 20 chemicals representative of migrants from plastic food contact materials on silica gel with chloroform - acetone - petroleum ether 11:5:5. Yeast estrogen screen was performed by spraying with yeast culture, followed by incubation at 30 ºC for 3 h. Detection by spraying with the indicator (2 mL 0.5 mg/mL 4-methylumbelliferyl-β-D-galactopyranoside-MUG in lacZ buffer), followed by incubation at 37 ºC for 20 min. Qualitative identification under UV light at 366 and 550 nm. The method was more sensitive than a microtiter plate YES (lyticase-YES). 

Anal. Bioanal. Chem. 411, 6767-6775 (2019). HPTLC of nonylphenols in surface waters on RP-18 with n-hexane - acetonitrile - toluene 8:4:3, followed by a second development with n-hexane - ethyl acetate - toluene 5:8:1. Yeast estrogen screen was performed by dipping into a suspension of genetically modified Saccharomyces cerevisiae BJ3505 cells, followed by incubation at 30 ºC for 4 h with a relative humidity of approximately 100 %. The dried plate was then immersed in the substrate solution for 3 s (0.1 mg/mL resorufin-β-D-galactopyranoside - RGP) and again incubated at 37 ºC for 30 min. Drying, dipping, and incubation with RGP was repeated two times. Quantitative determination by fluorescence measurement at 550 nm/> 580 nm. Linearity was between 15 and 40 ng/zone. The LOD and LOQ were 14 and 26 ng/zone. Average recovery was 95 %.