Abstract
1. 1. Construction of a high-resolution zonal scraper for rapid and quantitative transfer of small zones (1−, 2−, and 5-mm) of adsorbent from narrow glass plates (2 cm wide) into counting vials for liquid scintillation radioassay has been described in detail. Zonal scans made with this scraper are shown for thin-layer chromatograms of an impure tripalmitin-C 14OOH sample and of a total lipid extract of C 14-lipids from rat bone marrow. 2. 2. The scintillation solvent system described (dioxane-water-naphthalene) deactivates silica, thereby preventing adsorption on particles of silica and self-absorption loss of many polar radioactive compounds. It has been shown that silica, iodine, dichlorofluorescein, and rhodamine 6G have no quenching properties in this system, whereas elemental carbon (H 2SO 4 charring) causes severe quenching.
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