J. Liquid Chromatogr. 14, 3269-3275 (1991). HPTLC of phospholipids on silica with eight solvent systems. Detection by spraying with cupric sulfate phosphoric acid solution and heating at 160 °C for 10 min. Comparison of the mobile phases. Rf values for four systems are tabulated. Chloroform – methanol – water 65:25:4 was the best overall separation of phospholipid standards.

J. Planar Chromatogr. 4, 266-267 (1991). TLC of baygon, carbaryl, and carbofuran on silica with hexane – acetone 4:1. Detection with diazotized arylamines (aniline, p-chloroaniline, p-toluidine, sulfanilic acid, m-nitroaniline, sulfadiazine, and dapsone); dapsone was found to be the most suitable detection reagent. Detection limit ca. 0.1 µg. Simple, rapid and sensitive TLC method.

J. Planar Chromatogr. 4, 337-338 (1991). TLC of aminophenazone on silica with chloroform - ether - methanol 7:5:1. Measurement of the absorbance after extraction against reference solution (extraction of the ion associate of iron (III) with 1,10-phenanthroline and bromophenol blue).

J. Planar Chromatogr. 6, 497-498 (1993). TLC of nitrazepam, diazepam, medazepam, chlordiazepoxide on silica with hexane - acetone 6:4. Detection by spraying with stannous chloride in 1:1 hydrochloric acid and heating at 100 °C for 10 min. After cooling the plate was sprayed with 10% ammonium chloride solution and then, after 5 min., with sodium nitrite reagent followed by 0.1% Griess reagent.

Indian Drugs 41 (1), 46-47, 2004. HPTLC on silica gel plates with n-propanol - formic acid - water 90:1:9. Rf of berberine was 0.39. Quantification by densitometry at 348 nm via linear regression in the range of 40-220 ng. Limit of quantification and limit of detection were found to be 30 ng and 10 ng, respectively. The herbal extract was found to contain 0.402 % w/w of berberine. The percentage of berberine in formulations I, II, III and IV were 0.0886 %, 0.0123 %, 0.0283 % and 0.0091 % w/w, respectively. The standardized method was found to be reproducible, accurate, precise and selective.

IPC 56th 2004, Abstract No. D-9. HPTLC for the standardization of the alkaloid conessine in several market formulations containing kurchi bark, on silica gel with toluene - methanol - chloroform 1:2:1. Detection by spraying with Dragendorff’s reagent. Densitometric evaluation at 460 nm. The method was validated for accuracy, precision, linearity range, specificity, LOD, LOQ and found suitable for routine analysis of herbal formulations containing Kurchi as main ingredient.

IPC 56th 2004, Abstract No. CP-32. A stability indicating HPTLC method has been developed for the analysis of solid dosage forms containing beta-carotene. HPTLC of beta-carotene on silica gel with petrol ether (40-60 °C) - methanol - toluene 4:8:1. Rf value of beta-carotene was 0.65-0.70. Quantification by densitometric evaluation at 460 nm. The method was validated for accuracy, precision, linearity, and stability, and can be adopted for routine analysis of beta-carotene in formulations.

extract by planar chromatography techniques (TLC and AMD). J. Sep. Sci. 29, 2245-2250 (2006). HPTLC of four boswellic acids: 11-keto-beta-boswellic acid (1), acetyl-11-keto-beta boswellic acid (2), beta-boswellic acid (3), and acetyl-beta-boswellic acid (4) on silica gel with automated multiple development (AMD) using solvent gradients. Quantitative determination of 1 and 2 by absorbance measurement at 254 nm. 3 and 4 are quantified after derivatization with anisaldehyde sulfuric acid reagent at 560 nm. The AMD system provides good separation and the method is simple, precise, specific, sensitive, and accurate.