An ultra acid stable reversed stationary phase

Area of Science:

• Analytical Chemistry
• Chromatography Science

Background:

• Reversed-phase liquid chromatography (RPLC) is a cornerstone technique in chemical analysis.
• Developing RPLC phases with enhanced stability, particularly under acidic conditions, remains a critical challenge.
• Existing RPLC phases often degrade under aggressive mobile phase conditions, limiting their applicability.

Purpose of the Study:

• To synthesize and characterize a new RPLC phase with superior acid stability.
• To evaluate the performance of the new phase under extreme mobile phase conditions.
• To investigate the structural properties contributing to the phase's stability.

Main Methods:

• Synthesis of the Si-1-PS-C8 phase using silica modification and Friedel-Crafts alkylation.
• RPLC performance evaluation using aggressive mobile phases (pH 0.5, 150°C) and monitoring retention factor (k').
• Scanning electron microscopy (SEM) to analyze the silica particle coating structure.

Main Results:

• The Si-1-PS-C8 phase exhibited remarkable acid stability, with minimal loss of retention factor after 1400 column volumes.
• Symmetric peak shapes were observed for various basic solutes, indicating good chromatographic performance.
• SEM analysis revealed a highly cross-linked coating on the silica particles, suggesting a robust structure.

Conclusions:

• The newly developed Si-1-PS-C8 phase offers unparalleled acid stability compared to existing RPLC phases.
• The phase's robust, cross-linked structure is key to its exceptional durability under harsh conditions.
• This advancement provides a highly stable RPLC option for challenging analytical applications.