(Peel). J. Planar Chromatogr. 30, 510-515 (2017). HPTLC of protocatechuic acid (1) and quercetin 4ʹ-O-β-D-glucopyranoside (2) in Allium cepa on silica gel with toluene – ethyl acetate – formic acid 3:6:1. Quantitative determination by absorbance measurement at 275 nm. The hRF values for (1) and (2) were 56 and 5, respectively. Linearity was between 100 and 700 ng/zone for (1) and (2). LOD and LOQ were 32 and 92 ng/zone for (1) and 30 and 92 ng/zone for (2). The intermediate precision was <2 % (n=6). Recovery ranged from 98.1 to 99.6 % for (1) and 98.2 to 99.9 % for (2).

J. Planar Chromatogr. 31, 155-162 (2018). HPTLC of lawsone in Lawsonia inermis on silica gel with benzene ‒ ethyl acetate ‒ acetic acid 75:25:1. Quantitative determination by absorbance measurement at 275 nm. The hRf value for lawsone was 33. Linearity was in the range of 50-350 ng/zone. The intermediate precision was below 2 % (n=6). The LOD and LOQ were 16 and 50 ng/zone for lawsone, respectively. Average recovery was 96 %.

J. Planar Chromatogr. 31, 318-326 (2018). HPTLC of quercetin (1), kaempferol (2), and keto-β-boswellic acid (3) in the herbal extracts of Spinacia oleracea and Boswellia serrata on silica gel with hexane ‒ ethyl acetate ‒ glacial acetic acid 30:20:1. Quantitative determination by absorbance measurement at 272 nm. The hRF values for (1) to (3) were 22, 40 and 54, respectively. Linearity ranged between 1500-3500 ng/zone for (1), 200-600 ng/zone for (2) and 1040-3120 ng/zone for (3). LOD and LOQ were 185 and 560 ng/zone for (1), 42 and 125 ng/zone for (2), and 324 and 981 ng/zone for (3), respectively. The intermediate precision was <2 % (n=3). Recovery ranged between 97 and 100 %.

J. Planar Chromatogr. 31, 445-450 (2018). HPTLC of benzyl isothiocyanate in the root of Salvadora persica with n-hexane. Quantitative determination by absorbance measurement at 254 nm. The hRF value for benzyl isothiocyanate was 39. Linearity was between 3–15 µg/zone. LOD and LOQ were 1 and 3 μg/zone. The intermediate precision was <2 % (n=3). Recovery was between 95.2 and 103.2 %.

Acta Chromatographica 14, 60-69 (2004). TLC on silica gel with 1-butanol - glacial acetic acid - water 3:1:1 with chamber saturation. Detection by spraying with ninhydrin reagent (0.3 g ninhydrin in 100 mL 1-butanol plus 2 mL glacial acetic acid), followed by heating at 110 ºC for several min. Quantification by densitometry at 495 nm. Validation of the accuracy by analysis of spiked blank and standard addition samples and precision by performing replicate analysis on a single day and on different days. Recoveries and RSD for spiked blank and standard addition samples were 98.8 % and 98.5 %, 1.92 % and 0.67 %, respectively. Discussion of use of the method for the routine quality control of nutritional supplements.

CBS 87, 6-7 (2001). HPTLC on silica gel with chloroform - methanol - water 6:4:1. Detection by spraying with 10 % ethanolic sulfuric acid solution, followed by heating at 120 °C. Quantitative determination by absorbance measurement at 450 nm.

J. Chinese Trad. Patent Med. (Zhongchengyao) 10, 858-860 (2004). TLC on silica gel with 1) chloroform - methanol - water 13:7:2, 2) isopropanol - ethyl acetate - water 17:9:9, n-butanol - formic acid - water 15:3:2. Detection 1) by spraying with 10 % H2SO4 in ethanol and heating at 110 ºC, 2) by spraying with 0.3 % ninhydrin in n-butanol, 3) by spraying with 10 % vanillin solution. Identification by fingerprint techniques. Quantitative determination of ginsenoside by HPLC.

Chinese J. Trad. Patent Med. (Zhongchengyao) 26 (5) 364-367, (2004). TLC of Bunao pill extracts on silica gel with 1) dichloromethane - methanol 10:1; 2) acetone - benzene - hydrochloric acid (3 mol/L) 80:30:1. Detection 1) by spraying with 5 % phosphomolybdic acid in ethanol and heating at 120 ºC ; 2) by spraying with hypo acetamide solution and heating at 80-100 ºC. Identification by fingerprint techniques. Quantification of tanshinone ll by HPLC with method validation.