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chromatography 音标拼音: [kromət'ɑgrəfi] n. 套色版 套色版 chromatography n 1: a process used for separating mixtures by virtue of differences in absorbencyChromatography \ Chro` ma* tog" ra* phy\, n. [ Gr. ?, ?, color - graphy.] 1. A treatise on colors [ archaic] [ 1913 Webster] 2. ( Chem.) an analytical and preparative technique for separating substances by differences in their selective adsorption to solids, by passing a liquid over the solid, to which the substances to be separated have usually been adsorbed in a preliminary step. The major variations are column chromatography, in which the substances to be separated are adsorbed to a column with any of a wide variety of adsorbing solids in powdered or granulated form; paper chromatography, in which the solids are applied as a spot at one end of a strip of absorbent paper ( such as filter paper), and the liquid is percolated through the paper by capillary action; and thin- layer chromatography ( TLC), which is similar to paper chromatography, but the adsorbent material is, instead of paper, a thin layer of finely powdered material, such as cellulose or silica, on a backing of glass or plastic, called a TLC plate. A modern version of { column chromatography} is high- performance liquid chromatography, usually referred to as HPLC. [ PJC]
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