Chromatographia 66 (11-12), 605-608 (2007). HPTLC of both isomers of cefpodoxime proxetil on silica gel plate with toluene - acetonitrile 3:2. Quantification by densitometry at 234 nm. The limit of detection and quantification was 150 and 400 ng/zone, respectively.

J. Planar Chromatogr. 20, 107-115(2007). TLC of atorvastatin, cerivastatin, fluvastatin, lovastatin, and simvastatin on silica gel, diol and cyano layers in horizontal chambers with binary mobile phases contaning hexane and a polar modifier in different proportions. Optimum normal-phase system was diol phase with hexane - tetrahydrofuran 3:2. Visualization under UV light at 254 nm. Quantitation by densitometry.

J. Sep. Sci. 30, 2086-2091 (2007). HPTLC of 4alpha-methyl-24beta-ethyl-5alpha-cholesta-14,25-dien-3beta-ol (1), 24beta-ethylcolesta-5,9,11,22E-trien-3beta-ol (2), and betulinic acid (3) in Clerodendrum inerme on silica gel with toluene - ethyl acetate 47:3. Quantitative determination by absorbance measurement at 620 nm. The hRf value was 48, 34 and 22 for compounds (1) , (2) and (3), respectively. Linearity was between 100 and 2500 ng/zone. The limits of detection and quantification were 5, 6, and 10 µg/mL and 14, 18, and 29 µg/mL, respectively, for (1), (2), and (3).

Indian J. Pharm. Sci. 69(3), 473 (2007). Dried leaves were Soxhlet extracted with methanol and concentrated. HPTLC of andrographolide in Andrographis paniculata on silica gel with chloroform - methanol 7:1 with chamber saturation for 15 min. Densitometric evaluation at 232 nm. The hRf value of andrographolide was 35, of neoandrographolide 15 and of andrographoside 3. The linearity range was 200 - 1000 ng/zone. Average andrographolide contents were 1.56 % in dried leaves sample.

Chromatographia 66 (9-10), 801-804 (2007). HPTLC of withaferin A and withanolide A in Withania somnifera methanolic extract from different plant parts (leaf, root, stem and fruit) and of two morphotypes, on silica gel with toluene - ethyl acetate - formic acid 5:5:1. Quantification by densitometry in absorption mode at 530 nm. Linearity was between 200 and 3200 ng for both withaferin A and withanolide A. The average recovery of withaferin A and withanolide A was 96.0 and 96.7 %.

Indian J. Pharm. Sci. 69(4), 589 (2007). HPTLC of ropinirole on silica gel with methanol - acetone 4:1. Aripiprazole was used as internal standard. Under chromatographic conditions both ropinirole and aripiprazole were well separated. Evaluation under UV 254 nm. UV spectrometry was carried out at 250 nm.

J. Planar Chromatogr. 21, 113-117 (2008). HPTLC of alpha-solanine and alpha-chaconine on silica gel with chloroform - methanol - water - aqueous ammonia 140:60:10:1. Detection by dipping in cerium(IV) sulfate derivatization reagent. Quantitative determination by absorbance measurement at 505 nm.

CBS 100, 10-12 (2008). HPTLC of beta ecdysone in Pfaffia glomerata extract on silica gel over 50 mm with the lower phase of chloroform - methanol - water 7:5:2 after chamber saturation for 15 min. Detection by dipping in anisaldehyde reagent (0.5 mL anisaldehyde, 10 mL acetic acid, 5 mL sulfuric aicd, and 85 mL methanol) followed by heating at 120 °C for 20 min. Quantitative determination by absorbance measurement at 432 nm. Polynomial calibration in the range of 0.04 to 0.2 µg/band (sdv 1.6 %). The evaluated extracts contained 0.8 to 1.2 % of beta ecdysone.