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A UPLC (ultra-high performance liquid chromatography) is a variant of HPLC using columns with particle size <2 um (typically, 1.8 um), which provides significantly better separation than the traditional (5 um) columns and enables much faster analysis. Strictly speaking, "UPLC" is Waters Corporation trademark, but is often used as a name for the technique in general.

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Q: What is difference between uplc and hplc?
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