J. Planar Chromatogr. 34, 243-252 (2021). HPTLC of dapagliflozin (1) and metformin (2) on silica gel with methanol - ethyl acetate - ammonium acetate 60:40:1. Quantitative determination by absorbance measurement at 220 nm. The hRF values for (1) and (2) were 79 and 31, respectively. Linearity was between 20 and 100 ng/zone for (1) and 500 and 2500 ng/zone for (2), respectively. Intermediate precisions were below 2 % (n=5). The LOD and LOQ were 3 and 10 ng/zone for (1) and 11 and 34 ng/zone for (2), respectively. Recovery was between 100.0 % and 101.6 % for (1) and 99.7 % and 101.1 % for (2).

J. Planar Chromatogr. 34, 211-215 (2021). HPTLC of acebutolol enantiomers on silica gel with acetonitrile - methanol - water 11:5:2. Detection by exposure to iodine vapor. The stationary phase with the chiral selector was prepared by mixing 25 g silica gel with 50 mL of a 50 mM solution of colistin sulfate, followed by drying and activation overnight at 60 °C. The LOD for each enantiomer of acebutolol was 12-15 μg/zone. Recovery was between 87 and 91 %.

J. Food Sci. 85, 1781-1792 (2020). HPTLC of scented (joha) rice and black rice variety on silica gel with chloroform - methanol 19:1 + 0.1 % formic acid and butanol - acetic acid - water 4:1:5. Detection by spraying with p-anisaldehyde and visualization under UV light at 200, 250 and 350 nm. The husk of the selected rice varieties contained the nonpolar metabolites whereas the seeds contain nonpolar as well as polar metabolites.

J. Food Sci. 85, 3183-3190 (2020). HPTLC of astragalosides standards (I-IV) in Pleurotus ostreatus on silica gel with trichloromethane - methanol - ethyl acetate - water 13:7:2:2. Detection by spraying with 10 % sulfuric acid in ethanol and visualization under IV light at 365 nm. The hRF values for (I) to (IV) were 71, 54, 34 and 31, respectively. Further analysis by mass spectrometry.

Sens. Actuators. B. Chem. 299, 126902 (2019). TLC-surface-enhanced Raman scattering (TLC-SERS) of melamine contaminated milk samples on silica gel with acetone - chloroform - ammonia 14:1:4. Then 2 μL gold nanoparticle were drop onto the analyte spot. Quantification using a Raman microscope equipped with a CCD detector to acquire the surface-enhanced Raman scattering spectra. Excitation wavelength was 785 nm. A parallel representation model of the triple-spectral data was constructed using a pure quaternion matrix. Quaternion principal component analysis (QPCA) was utilized for feature extraction and followed by feature crossing between the quaternion principal components to obtain final fusion of spectral feature vectors.

Sens. Actuators. B. Chem. 325, 128753 (2020). Leucomalachite green (1) and malachite green (2) and certain amount of highly dispersed potassium iodate titanium dioxide composites (0.1 M titanium butoxide was used as a precursor with 5 % potassium iodate solution to prepare KIO3-doped TiO2 nanoparticles). The sample was developed with chloroform - methanol 4:5. Detection by dipping into 5 % potassium iodine, followed by heating and then dipping into a zinc ion solution followed by heating at 80 °C. Linearity was in the range of 0.3–8.0 μg/mL for (1) and 0.1–4.0 μg/mL for (2), respectively. LOD and LOQ were 1.7 and 5.2 μg/kg for (1) and 0.9 and 2.7 μg/kg for (2), respectively.

Revista Bio Ciencias. 6, 670 (2019). HPTLC of the leaves of Turnera diffusa on silica gel with ethyl acetate - acetic acid - formic acid - water 100:11:11:27. Detection by spraying with 1 % 2-aminoethyl diphenyl borate in methanol (NP) and with 5 % polyethylene glycol 4000 in ethanol (PEG). Qualitative analysis under UV light at 254 and 366 nm.

Ars. Pharm. 62, 348-357 (2021). HPTLC of gallic acid (1), quercetin (2) and coumarin (3) in the leaves of Sonneratia apetala on silica gel with toluene - ethyl acetate - formic acid 45:30:2. Quantitative determination by absorbance measurement at 280 nm. The hRF values of (1) to (3) were 20, 42 and 51, respectively.