biostudies-literatureUnknown10(4)Jadeja SMicrobore columns with a 1.0 mm inner diameter (i.d.) have gained popularity in microflow liquid chromatography-mass spectrometry (LC-MS) workflows for exploratory proteomics applications due to their high throughput, robustness, and reproducibility. However, obtaining highly efficient separation using these columns remains unachievable, primarily due to significant radial flow heterogeneity caused by uneven particle packing density across the column cross-section. In this study, we evaluated the integration of a 1.5 mm i.d. column, which offers greater packing uniformity and reduced radial flow dispersion, into a microflow LC-MS setup for bottom-up proteomics analysis. The performance of the 1.5 mm i.d. column was compared with that of the 1.0 mm i.d. column using protein samples of varyiACS omega4094-4101https://www.ebi.ac.uk/biostudies/studies/S-EPMC11800007biostudies-literatureMicroflow LC-MS Bottom-Up Proteomics Using 1.5 mm Internal Diameter Columns.PMC11800007Sklenarova HPlachka KRitchie HLenco JJadeja SNaplekov DKStarovoit MRLawhorn JfalseMicroflow LC-MS Bottom-Up Proteomics Using 1.5 mm Internal Diameter Columns.Microbore columns with a 1.0 mm inner diameter (i.d.) have gained popularity in microflow liquid chromatography-mass spectrometry (LC-MS) workflows for exploratory proteomics applications due to their high throughput, robustness, and reproducibility. However, obtaining highly efficient separation using these columns remains unachievable, primarily due to significant radial flow heterogeneity caused by uneven particle packing density across the column cross-section. In this study, we evaluated the integration of a 1.5 mm i.d. column, which offers greater packing uniformity and reduced radial flow dispersion, into a microflow LC-MS setup for bottom-up proteomics analysis. The performance of the 1.5 mm i.d. column was compared with that of the 1.0 mm i.d. column using protein samples of varyi2025-01-01T00:00:00Z2025 Feb2026-06-02T07:12:34.912Z2025-04-07T04:58:31.677ZS-EPMC118000073992654410.1021/acsomega.4c10591