Theory-guided efficient strategy to maximize speed and resolution in rapid gradient LC-MS/MS bioanalysis

Area of Science:

• Analytical Chemistry
• Biochemistry
• Pharmacokinetics

Background:

• Rapid gradient LC-MS/MS methods are prevalent in bioanalytical laboratories.
• Optimizing these methods for speed and resolution is crucial for efficiency.

Purpose of the Study:

• To develop a theory-guided strategy for maximizing resolution and speed in rapid gradient LC-MS/MS bioanalysis.
• To investigate the impact of gradient time, eluent strength, and flow rate on separation performance.

Main Methods:

• Studied the effects of gradient time (tG), initial/final organic solvent percentage (%B), and flow rate (F).
• Evaluated separation of five structurally related compounds using reversed-phase gradient LC-MS/MS.
• Applied basic resolution equations in gradient elution theory for mathematical explanation.

Main Results:

• Optimizing gradient time and mobile phase composition achieved comparable resolution and peak capacity in shorter run times.
• Higher flow rates were found to improve resolution, peak capacity, and reduce run time.
• A systematic approach for rapid gradient LC-MS/MS method development was proposed.

Conclusions:

• A theory-guided strategy can significantly enhance speed and resolution in rapid gradient LC-MS/MS bioanalysis.
• Flow rate is a critical parameter for improving performance in rapid gradient separations.
• The proposed approach considers analytes and potential matrix effects for robust method development.