Multi-²D LC × LC as a Novel and Powerful Implement for the Maximum Separation of Complex Samples

Area of Science:

• Analytical Chemistry
• Chromatography
• Food Science

Background:

• Complex sample analysis, such as in food science, demands advanced techniques for complete chemical profiling.
• Conventional and comprehensive two-dimensional (2D) liquid chromatography (LC × LC) often lack sufficient separation power for intricate matrices like vermouth.
• Vermouth's complex composition, derived from macerated herbs, fruits, and spices, presents a significant analytical challenge.

Purpose of the Study:

• To develop and validate a novel multi-2D LC × LC strategy for enhanced separation of complex samples.
• To improve peak capacity and orthogonality in liquid chromatography analyses.
• To provide a more comprehensive chemical profile of challenging matrices like vermouth.

Main Methods:

• Development of a multi-2D LC × LC system utilizing two distinct columns with different separation properties in the second dimension (2D).
• Sequential column selection in the 2D based on the chemical nature of compounds eluted from the first dimension (1D).
• Application of a 1D-PFP column coupled with a 2D system employing HILIC (0-30 min) and C18 (30 min onwards) columns for vermouth analysis.

Main Results:

• The multi-2D LC × LC setup significantly increased peak capacity compared to single-column 2D approaches.
• Enhanced orthogonality was achieved, leading to improved resolution of compounds within the complex vermouth matrix.
• The novel strategy provided a more complete separation profile than conventional or standard LC × LC methods.

Conclusions:

• Multi-2D LC × LC is a powerful integrated tool for maximizing separation capacity in the analysis of very complex samples.
• This advanced chromatographic approach offers superior performance for detailed chemical characterization.
• The developed method provides a significant advancement for analytical challenges in food and beverage analysis.