J. Sep. Sci. 29, 2292-2295 (2006). HPTLC of 6-gingerol in the rhizomes of Zingiber officinale on silica gel with n-hexane – diethyl ether 2:3. Quantitative determination by absorbance measurement. Linearity of determination of 6-gingerol is between 250 and 1200 ng and its average percentage recovery is between 99.79 - 99.84 %. The method permits a good resolution and separation of other constituents of ginger.

Chromatographia 65 (3-4), 239-243 (2007). Description of a novel TLC densitometric method for the determination of solasodine in various Solanum species (Solanaceae). Solasodine does not show UV absorption therefore TLC of an ion pair complex of solasodine with an acid dye was performed. TLC plates developed by using a solvent with an organic acid ensured in situ color development of the complex. Densitometry at 461 nm. Linearity was 79.2 - 495 ng/zone, with a correlation coefficient of 0.995. The method shows good reproducibility, specificity and accuracy (98.54 ± 2.8%), and eliminates post derivatization steps and the problem of background interference. Validation of the method and application of the method to determine solasodine content in various herb samples, herb extract and their formulations, without matrix interference observed.

J. Liq. Chromatogr. & Relat. Technol. 30, 489-498 (2007). TLC of fenbendazole (methyl [5-(phenylthio)-1H-benzimidazole-2-yl]-carbamic acid methyl ester) on silica gel using dichloromethane - ethyl acetate - formic acid - methanol 60:5:3:3. Quantitative determination by absorbance measurement at 293 nm. Linearity (peak area) is given between 500 and 1400 ng/spot.

J. Liq. Chromatogr. & Relat. Technol. 30, 1749-1762 (2007). HPTLC of omeprazole (5-methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl)methyl]sulfinyl]-1H-benzimidazole) and domperidone (5-chloro-1-[1-[3-(2,3-dihydro-2-oxo-1H-benzimidazol-1-yl)propyl]-4-piperidinyl]-1,3-dihydro-2H-benzimidazol-2-one) on silica gel with ethyl acetate - methanol - benzene 2:1:2. Quantitative determination by absorbance measurement at 295 nm.

J. Chromatogr. A 1155 (1), 112-123 (2007). Presentation of a novel strategy for the fractionation of complex peptide mixtures using two-dimensional planar electrochromatography/thin-layer chromatography (2D PEC/TLC). It was found that phosphopeptides migrate more slowly in the first dimension, based upon their anionic phosphate residues, and certain predominantly acidic phosphopeptides even migrate in the opposite direction, relative to the bulk of the peptides. Further distinguishing phosphopeptides based upon hydrophilicity in the second dimension, which permits a restricted region of the plate to be directly interrogated for the presence of phosphopeptides by MS. Discussion of peptide sequencing and identification of phosphopeptide from the plates by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF)-MS and tandem MS.

J. Planar Chromatogr. 20, 327-330 (2007). TLC of beta-sitosterol on silica gel with toluene - ethyl acetate - glacial acetic acid 15:4:1 with chamber saturation for 30 min. Visualization by spraying with anisaldehyde reagent and heating at 90 °C for 5 min. Densitometric quantitation at 525 nm.

59th Indian Pharmaceutical Congress C-100, 248, (2007). An HPTLC method has been developed for the estimation of flavonoids tannin and saponin in Caesalpinia bonduc. The dried powdered leaves of the plant were extracted with methanol and used for evaluation. HPTLC on silica gel with ethyl acetate - formic acid - glacial acetic acid - water 20:2:2:5 for flavonoids, chloroform - glacial acetic acid - methanol - water 16:8:3:2 for saponin, and ethyl acetate - toluene - formic acid 6:6:1 for tannin. Detection by spraying with 5 % methanolic sulphuric acid for saponin, 5 % alcoholic aluminium chloride solution for flavonoids, and 5 % ferric chloride solution for tannin. Densitometric evaluation at 254 nm and 366 nm.

J. Planar Chromatogr. 20, 179-182 (2007). HPTLC of apigenin on silica gel with chloroform - acetone - formic acid 76:16:8 in a twin-trough chamber saturated for 30 min. Quantification by densitometric scanning at 340 nm.