J. Planar Chromatogr. 32, 41-46 (2019). HPTLC of ayapanin in the leaves of Ayapana triplinervis on silica gel with ether - ethyl acetate 3:2. Quantitative determination by absorbance measurement at 254 nm. The hRF value of ayapanin was 56. Linearity was between 200 and 1000 ng/zone. The intermediate precision was below 0.8 % (n=6). The LOD and LOQ for ayapanin were 54 and 169 ng/zone, respectively. Recovery rate was 99.7 % for ayapanin.

Chromatographia 67 (3-4), 315-313 (2008). Investigation of two different chromatographic substrates and one interface for coupling surface-enhanced Raman spectroscopy (SERS) with TLC. A chromatographic thin layer, specially produced for RS measurements, and a monolithic silica thin layer were used. A typical TLC plate with a modified aluminium backplate foil on one side was used as an interface. As test analytes three biologically active diterpenes (gibberellic acid, abietic acid, and kaurenoic acid) were applied directly onto the surface, followed by the addition of silver colloid and measurements by SERS. The strongest signal (excitation at 514.5 nm) was obtained for gibberellic acid using a Raman treated thin layer where the enhancement factor value was determined to be 102. No useful SERS signals were observed when the monolithic silica layer was used. Similar SERS spectra on modified aluminium backplate were obtained for abietic acid and gibberellic acid and no SERS spectrum was obtained for kaurenoic acid.

J. Planar Chromatogr. 20, 365-371(2007). Estimation of retention data by use of correlation equations and physicochemical properties is a useful tool in liquid chromatography. HPTLC of an homologous series of 9 s-triazines on RP-18, cyano-, and amino phase in unsaturated chambers with aqueous solutions of the organic solvents acetonitrile, tetrahydrofuran, and dioxane. After development the dried plates were examined under UV light at 254 nm.

59th Indian Pharmaceutical congress C-325, 303, (2007). HPTLC of curcumin and 6-gingerol in Curcuma longa and Zingiber officinalis on silica gel with chlorofom - ethanol - glacial acatic acid 24:1:2 for curcumin, and n-hexane - ethanol 2:3 for 6-gingerol. Densitometry at 430 nm for curcumin and 280 nm for 6-gingerol. The developed method was found suitable for routine analysis of extract and marketed formulations.

59th Indian Pharmaceutical Congress F-83, 410, (2007). HPTLC of rabeprazole sodium and domperidone on silica gel with toluene - acetone - methanol 9:9:1. The hRf value of domperidone was 32 and of rabeprazole sodium 53. Densitometry at 285 nm. Lienarity was between 50 and 800 ng/zone for both compounds. The method was found suitable for routine analysis of formulations.

Indian J. Pharm. Educ. Res. 41(3), 261 (2007). HPTLC of irbesartan on silica gel with toluene - ethyl acetate - acetic acid 70:30:2. Densitometric aevaluation at 305 nm. Linearity was between 500-6000 ng/zone. Limit of detection and quantification was 100 and 400 ng/zone, respectively. Recovery was more than 100 %. The degradation products as result of acid and alkali hydrolysis, oxidation, dry and wet heat treatment and photodegradation were well separated from tirbesartan.

59th Indian Pharmaceutical congress C-344, 308, (2007). TLC of different fractions of fruits of Azadirecta indica on silica gel with ethyl acetate - n-hexane 1:1. The MIC value was determined in comparison with gedunin isolated from the plant. The fungi were sub cultured and incubated for seven days, then sprayed on the developed plate, followed by incubation at 37°C . Zones of inhibition were measured. Antifungal activity was observed with Aspergillus niger, Fusarium specis, and Penicillium chrysogenum.

59th Indian Pharmaceutical congress F-10, 392, (2007). HPTLC of olmesartan medoxomil and hydrochlorothiazide on silica gel with acetonitrile - chloroform - glacial acetic acid 14:4:1 with chamber saturation for 30 min. Densitometric evaluation at 254 nm. Linearity was between 480 and 900 ng/zone for olmesartan and 150 and 600 ng/zone for hydrochlorothiazide. Recovery was 99.7 - 100.4 % . The method can be used for routine quality control of formulations.