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Title: Gas Chromatography
Author: Joseph B. Bissmeyer
Source: 1975 International School of Hydrocarbon Measurement
Year Published: 1975
Abstract: At the turn of the century, in the year 1906, Mikhail Tswett, a Russian botanist, took some green leaves from a plant, pulverized them and poured liquid petroleum ether over them. While this mixture of leaves and petroleum ether was reacting, Tswett took a glass tube and filled it with powdered chalk (calcium carbonate). He poured the petroleum ether extract into the top of the glass column of powdered chalk. As the solution percolated through the column, colored bands of green and yellow appeared on the chalk column. The green band represents the chlorophyl components and the yellow band represents the carotenoid components of the mixture. Carotenoids are chemicals that give carrots and butter a yellowish-orange color.

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