What is the difference between isocratic and gradient application?

You can run your application in two different ways. Isocratic and gradient. Isocratic means that the mixture of your mobile phase is consistent over the complete testing time. Using a gradient implies that the compounding of the eluent mixture is changed during measurement and so influences the retention of analytes. The separation can be either accelerated or decelerated.

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Analytical HPLC / UHPLC
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