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Column Recommendation for High-pH LC-MS Analysis of 5-Fluorouracil and 5-Chlorouracil

Record: 592

Category: Column Selection
Product: NH2P-50 2D
Sample: 5-FY and 5-CU

Question

A customer is separating 5-fluorouracil (5-FU) and 5-chlorouracil (5-CU) in mouse plasma using LC-MS on a Phenomenex Luna HILIC (2 × 150 mm) column. The method requires operation at pH 11–12.

What is the Shodex equivalent, and which column format is most suitable for LC-MS?

Answer

The closest Shodex equivalent to Phenomenex Luna HILIC is Shodex NH2P-50 2D. NH2P-50 2D is a polymer-based HILIC column available in a 2.0 mm I.D. format, making it suitable for LC-MS applications that require reduced flow rates and improved MS sensitivity. Because it is polymer-based rather than silica-based, NH2P is stable across a pH range of 2–13 and can tolerate operation at pH 11–12.

Since 5-fluorouracil and 5-chlorouracil are small, highly polar nucleobase analogs, maintaining a HILIC separation mechanism is typically appropriate if the current Luna HILIC separation is acceptable. Method performance should be verified under the specific buffer composition and MS conditions used.

If the primary objective is alkaline robustness rather than strict HILIC equivalency, a polymer-based reversed-phase column such as Shodex ODP-50 2D may also be considered. ODP-50 2D is stable from pH 2–13 and is designed for small-molecule pharmaceutical analysis, but use of this column would require method re-optimization due to the change in separation mechanism.

Applications demonstrating suitability of the ODP phase for small drug molecules include:

In summary, the direct Luna HILIC equivalent is NH2P-50 2D, while ODP-50 2D represents an alternative reversed-phase approach if desired.

Additional Comments

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