Fig. 1From: Comparative verification study of silica gel-coated TLC and HPTLC plates’ performances in separation of opium alkaloids on the basis of their physicochemical propertiesField-emission scanning electron photomicrographs of scraped silica. Magnification: 3000×. a Merck TLC plate. b Merck HPTLC plate. c MN TLC plate. d MN HPTLC plate. e Merck Lichrospher plateBack to article page