Peak splitting during HPLC analysis

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Many times peak splitting is observed during HPLC analysis. Majorly there are 3 main impacting factors due to which peak splitting is observed.

1) Contaminated guard column: Usually guard columns are not washed and this gives splitting of peaks when used for long time. This can be solved by reversing the guard column and flushing it with solvents.

2) Partially blocked frits:  This does not come to notice easily but is very important that frits should be timely changed or cleaned. Since coagulated frits will give rise to splitting of peaks.
3) Small uneven void at column inlet: Repack column with the particles or column should be flushed by reversing it. This will definitely give rid of peak splitting.


Comments

  1. AnonymousOctober 3, 2026 at 7:49 PM

    Good practical list — the partially blocked frit point is the sneaky one, since it creeps up gradually and people blame the method first. One addition from peptide analysis: when you're qualifying analytical peptide standards for method work, always re-run a known-good standard before concluding the sample is at fault. A split peak on a certified reference material points at the system (guard column, frit, or inlet void as you describe), not the material. Saved us from discarding good batches more than once. — Asher Gray (YourFitnessPeptides team; lab research use only)

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