The technique of gas chromatography (GC) is well known as an analytical tool but preparative applications are less common. Small-scale preparative GC is essentially analytical GC with the addition of a sample collection system at the column outlet; milligram or sub-milligram quantities can be conveniently handled. Isolation by repetitive injection is normally required. However, larger quantities of sample can also be handled on larger diameter columns (Henly and Royer 1969).
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