Gradient High-Performance Liquid Chromatography

Gradient high-performance liquid chromatography elutes analytes by progressively increasing mobile phase strength separating compounds by differential affinity. Linear gradients uniformly change solvent composition. Step gradients employ discrete composition changes. Isocratic elution maintains constant solvent composition. Gradient selection optimises separation resolution and analysis time.

Method development employs systematic gradient optimisation. Analytical validation establishes method appropriateness. Regulatory submissions justify method selections. Quality control analysis monitors product composition. Emerging ultra-high-performance chromatography reduces analysis time.