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Gradients in reversed-phase HPLC typically involve the on-line (dynamic) mixing of solvents to achieve a steady increase in the organic solvent (typically methanol or acetonitrile) over the course of the analysis, thus increasing the elution strength of the eluent over time.
In fact, RPC uses highly nonpolar stationary phases consisting mainly of long alkyl chains covalently bonded to the solid support, while the stationary phase used in HIC consists of a highly hydrophilic organic layer to which widely spaced, short alkyl or small aryl functions are attached.
In reversed phase the order of elution of components is determined by their polarity, i.e., the most polar elutes first [17].
Normal phase columns in HPLC are usually made of NH2, APS, and a cyano group (CN, CPS) as a bonded phase filler. The packing for reversed-phase chromatography is usually based on silica gel, and the surface is bonded to the bonded phase with relatively weak functional groups.
Reversed-phase HPLC (RP-HPLC) is the most commonly used mode of HPLC and, as the name implies, this mode is just the reverse of NP-HPLC, whereby the stationary phase is more nonpolar than the eluting solvent.
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Reversed-phase HPLC (RP-HPLC) is one of most important techniques for protein separations and the method of choice for peptide separation. RP-HPLC has been applied on the nano, micro, and analytical scale, and has also been scaled up for preparative purifications, to large industrial scale.
There are two phases for HPLC: the mobile phase and the stationary phase. The mobile phase is the liquid that dissolves the target compound. The stationary phase is the part of a column that interacts with the target compound.
Gradient elution chromatography is defined as a technique in HPLC where the composition of the mobile phase is altered during the chromatographic run to separate a mixture of solutes with varying retention factors.

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