J. Chromatogr. 609, 402-406 (1992). TLC of benzoxazolinone and 2,4-dihydroxy-1,4-benzoxyzin-3-one on silica with 1) chloroform - methanol - water 75:25:3, 2) butanol - methanol - water, 3) ethyl acetate - methanol - water 100:13:5:10, 4) chloroform - acetic acid 90:10. Detection under UV 254 nm and identification by IR and 3H NMR. Confirmation of the presence of 2-glucosyl-2,4-dihydroxy-1,4-benzoxazin-3-one also by TLC and HPLC.

Shokuhin Eiseigaku Zasshi (J. Food Hyg. Soc. of Jap.) 34, 517-523 (1993). Establishment of a confirmation method using reverse-phase TLC/FABMS for identifying residual tetracycline antibiotics. oxytetracycline, tetracycline, chlortetracycline and doxycycline in thiaglycerol as matrix.

Int. J. Mass. Spectrom. Ion Processes 140, 127-132 (1994). Description of IR laser desoption of naproxen from TLC plate. Ionization of the desorbed neutral molecules by two-photon ionization at a wavelength of 266 nm and recording mass spectra using a time-of-flight mass spectrometer. Investigation of the sensitivity and the effect of repeated irradiation of the same area of the TLC plate.

Anal. Chem. 67, 4565-4570 (1995). Introduction of a new approach for direct coupling TLC with matrix-assisted laser desorption/ionization mass spectrometry. To avoid excessive analyte spreading along a TLC plate, a matrix layer was first generated on a different substrate, from which it was transferred to the plate. The transfer was accomplished by pressing the matrix onto a previously wetted TLC plate. Successful direct imaging of silica gel TLC plates with high spatial resolution (250-500 µm) and high sensitivity has been demonstrated for several compounds, including rhodamine B, guinea green B, bradykinin, and angiotensin II, in the nanogram range. The detection limit was in the picogram range.

J. Chromatogr. A 731, 261-271 (1996). TLC on silica with petrol ether (65-95°C) - acetone - pyridine 10:4:1 and 20:8:5), and on RP-18 with methanol - acetone - water 20:4:3. Detection under UV 366 nm. Isolation of different allomerization products of pheophytins a and b by NP-TLC and semi-preparative HPLC. Separation of the corresponding Cu(II) complexes by RP-IR-HPLC. Discussion of the chromatographic characteristics in the two methods.

Chromatographia 46, 358-364 (1997). Report of the investigation and optimization of TLC/matrix-assisted laser desorption ionization (MALDI) coupling protocol, stressing on the fundamental coupling parameters which influence sensitivity and lateral analyte spreading, like extraction solvent selection, extraction time, and pressures. The upper analyte recovery limit, using extraction solvents with Rf values between 0.4 to 0.6 is estimated at 22%.

J. Planar Chromatogr. 11, 457-459 (1998). Description of a preconcentration method based on continuous elution and intense thermal desorption of the main volatile component in a narrow zone on the plate. A fiftyfold concentration of a model dye mixture from an aqueous solution was achieved on a TLC plate in 20 - 30 min. Silica gel, propan-2-ol as mobile phase and quantitation by densitometry at 530 nm. The technique enables determination of the amounts of common metals in drinking water.

J. Chinese Trad. & Herb. Drugs (Zhongcaoyao) 32 (5), 453-454 (2001). TLC on silica gel with 1) toluene - acetic acid - water 25:25:2. Detection by spraying with 10% sulfuric acid in ethanol and heating at 105°C for 5 min and under UV 365 nm. Identification by finger print technique.