J. Planar Chromatogr. 22, 381-384 (2009). TLC of aloin in commercial Ayurvedic preparations on silica gel (prewashed with methanol) with ethyl acetate - methanol - water 50:7:2 in a twin trough chamber with chamber saturation for 5-7 min at 30 +/- 4 °C and a relative humidity of 57 +/- 3 %. Quantitative determination by absorbance measurement at 360 nm. The limit of detection and quantification was 10 and 20 ng/band, respectively.

J. Planar Chromatogr. 22, 297-300 (2009). HPTLC of chlorogenic acid and of plant extracts on silica gel with ethyl acetate - formic acid - water 10:2:3 and ethyl acetate - formic acid - acetic acid - water 100:11:11:21 in a saturated horizontal chamber. Quantitative determination by absorbance measurement at 320 nm. Qualitative detection by derivatization with natural products reagent (1 % in methanol) followed by treatment with 5 % PEG 400 in ethanol.

Chinese J. Hospit. Pharm. 29 (4), 336-338 (2009). TLC of astragaloside in Tianjian capsules on silica gel with chloroform - methanol - water 13:6:2. Detection by spraying with 5 % sulfuric acid in ethanol followed by heating at 105 ºC until coloration. Quantification by densitometry at 515 nm. The linearity was between 0.98 and 4.90 µg/spot (r2 = 0.998), the %RSD was 2.4 % (n = 6) within plate and 2.3 % (n = 6) inter-plate, standard addition recovery was 99.2 % with RSD = 1.7 % (n = 6).

J. Planar Chromatogr. 23, 18-22 (2010). TLC of amphotericin B on silica gel with chloroform - methanol - borate buffer (pH 8.3) 4:5:1 in a chamber pre-saturated for 20 min. Detection under UV 366 nm. The hRf of the main component was 46, and of the minor component 31. Quantitative determination by absorbance measurement at 385 nm. Direct bioautography with Candida albicans proved to be the most sensitive method, with a detection limit of 0.8 ng per spot. For densitometric evaluation of plates at 385 nm ten times more substance is required.

J. Planar Chromatogr. 23, 134-136 (2010). TLC of sertraline on silica gel (prewashed with methanol) with chloroform - ethyl acetate - triethylamine 25:15:1 in a twin-trough chamber previously saturated for 10 min at room temperature. Quantitative determination by absorbance measurement at 279 nm. The hRf for sertraline was 40. Intra-day precision and inter-day precision was 99.84 % RSD and 99.92 % RSD, respectively. A good linear relationship between response (peak area) and amount was obtained over the range 2.7-7.9 µg/band.

J. Planar Chromatogr. 23, 148-155 (2010). HPTLC of rimonabant and degradation products on silica gel in a horizontal chamber with methanol - water 7:3. A compact band was obtained at hRf 71. Quantitative determination by absorbance measurement at 250 nm. Linear regression analysis of calibration data revealed good linear relationship with r = 0.9985 in the linear working range of 100-800 ng/band.

Encyclopedia of Chromatography Third Edition 1, 1640-1647 (2009). This review describes densitometry as the most widely used quantitative TLC method. The principles and theory of densitometry, as well as the instrumental design and data handling are also described. It also mentions in detail the applications and practical aspects of densitometry and finally describes the advantages of TLC/densitometry compared to HPLC.

Scholars Research Library 2(2), 328-332 (2010). A validated densitometric method has been development for simultaneous estimation of drotaverine and aceclofenac in combined dosage form. TLC on silica gel with methanol - ethyl acetate - glacial acetic acid 100:90:1. The hRf value of drotaverine was 18 and of aceclofenac 51. Densitometric evaluation at 300 nm. The method was linear in the range of 80-360 ng/band for drotaverine and 100-700 ng/band for aceclofenac. The average recovery was 99.8-100.2 %.