1. Principle of two-dimensional liquid chromatography (2D-LC)
The principle behind 2D-LC is that fractions from a first dimension (denoted
1
D) are transferred to a second dimension (denoted
2
D) for a second separation. Ideally, the two separations are complementary, bringing different selectivities to the compounds to be separated.
There are two main modes in 2D-LC. The first is called heart-cut (LC-LC), while the second is called comprehensive (LC×LC). For ease of reference, the terms heart-cut and comprehensive are used throughout this article. Figure
1
illustrates these two...
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Principle of two-dimensional liquid chromatography (2D-LC)