How changing the particle structure can speed up protein mass transfer kinetics in liquid chromatography

Fabrice Gritti, Krisztian Horvath, Georges Guiochon

Research output: Article

26 Citations (Scopus)

Abstract

The mass transfer kinetics of a few compounds (uracil, 112Da), insulin (5.5kDa), lysozyme (13.4kDa), and bovine serum albumin (BSA, 67kDa) in columns packed with several types of spherical particles was investigated under non-retained conditions, in order to eliminate the poorly known contribution of surface diffusion to overall sample diffusivity across the porous particles in RPLC. Diffusivity across particles is then minimum. Based on the porosity of the particles accessible to analytes, it was accurately estimated from the elution times, the internal obstruction factor (using Pismen correlation), and the hindrance diffusion factor (using Renkin correlation). The columns used were packed with fully porous particles 2.5μm Luna-C18 100Å, core-shell particles 2.6μm Kinetex-C18 100Å, 3.6μm Aeris Widepore-C18 200Å, and prototype 2.7μm core-shell particles (made of two concentric porous shells with 100 and 300Å average pore size, respectively), and with 3.3μm non-porous silica particles. The results demonstrate that the porous particle structure and the solid-liquid mass transfer resistance have practically no effect on the column efficiency for small molecules. For them, the column performance depends principally on eddy dispersion (packing homogeneity), to a lesser degree on longitudinal diffusion (effective sample diffusivity along the packed bed), and only slightly on the solid-liquid mass transfer resistance (sample diffusivity across the particle). In contrast, for proteins, this third HETP contribution, hence the porous particle structure, together with eddy dispersion govern the kinetic performance of columns. Mass transfer kinetics of proteins was observed to be fastest for columns packed with core-shell particles having either a large core-to-particle ratio or having a second, external, shell made of a thin porous layer with large mesopores (200-300Å) and a high porosity (≃0.5-0.7). The structure of this external shell seems to speed up the penetration of proteins into the particles. A stochastic model of the penetration of bulky proteins driven by a concentration gradient across an infinitely thin membrane of known porosity and pore size is suggested to explain this mechanism. Yet, under retained conditions, surface diffusion speeds up the mass transfer into the mesopores and levels the kinetic performance of particles built with either one or two porous shells.

Original languageEnglish
Pages (from-to)84-98
Number of pages15
JournalJournal of Chromatography A
Volume1263
DOIs
Publication statusPublished - nov. 9 2012

Fingerprint

Liquid chromatography
Liquid Chromatography
Porosity
Mass transfer
Kinetics
Proteins
Surface diffusion
Pore size
Uracil
Muramidase
Bovine Serum Albumin
Silicon Dioxide
Packed beds
Liquids
Stochastic models
Insulin
Membranes
Molecules

ASJC Scopus subject areas

  • Analytical Chemistry
  • Organic Chemistry
  • Biochemistry

Cite this

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title = "How changing the particle structure can speed up protein mass transfer kinetics in liquid chromatography",
abstract = "The mass transfer kinetics of a few compounds (uracil, 112Da), insulin (5.5kDa), lysozyme (13.4kDa), and bovine serum albumin (BSA, 67kDa) in columns packed with several types of spherical particles was investigated under non-retained conditions, in order to eliminate the poorly known contribution of surface diffusion to overall sample diffusivity across the porous particles in RPLC. Diffusivity across particles is then minimum. Based on the porosity of the particles accessible to analytes, it was accurately estimated from the elution times, the internal obstruction factor (using Pismen correlation), and the hindrance diffusion factor (using Renkin correlation). The columns used were packed with fully porous particles 2.5μm Luna-C18 100{\AA}, core-shell particles 2.6μm Kinetex-C18 100{\AA}, 3.6μm Aeris Widepore-C18 200{\AA}, and prototype 2.7μm core-shell particles (made of two concentric porous shells with 100 and 300{\AA} average pore size, respectively), and with 3.3μm non-porous silica particles. The results demonstrate that the porous particle structure and the solid-liquid mass transfer resistance have practically no effect on the column efficiency for small molecules. For them, the column performance depends principally on eddy dispersion (packing homogeneity), to a lesser degree on longitudinal diffusion (effective sample diffusivity along the packed bed), and only slightly on the solid-liquid mass transfer resistance (sample diffusivity across the particle). In contrast, for proteins, this third HETP contribution, hence the porous particle structure, together with eddy dispersion govern the kinetic performance of columns. Mass transfer kinetics of proteins was observed to be fastest for columns packed with core-shell particles having either a large core-to-particle ratio or having a second, external, shell made of a thin porous layer with large mesopores (200-300{\AA}) and a high porosity (≃0.5-0.7). The structure of this external shell seems to speed up the penetration of proteins into the particles. A stochastic model of the penetration of bulky proteins driven by a concentration gradient across an infinitely thin membrane of known porosity and pore size is suggested to explain this mechanism. Yet, under retained conditions, surface diffusion speeds up the mass transfer into the mesopores and levels the kinetic performance of particles built with either one or two porous shells.",
keywords = "Column technology, Core-shell particles, Mass transferresistance, Protein diffusivity, Protein separation, Resolution power",
author = "Fabrice Gritti and Krisztian Horvath and Georges Guiochon",
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AU - Gritti, Fabrice

AU - Horvath, Krisztian

AU - Guiochon, Georges

PY - 2012/11/9

Y1 - 2012/11/9

N2 - The mass transfer kinetics of a few compounds (uracil, 112Da), insulin (5.5kDa), lysozyme (13.4kDa), and bovine serum albumin (BSA, 67kDa) in columns packed with several types of spherical particles was investigated under non-retained conditions, in order to eliminate the poorly known contribution of surface diffusion to overall sample diffusivity across the porous particles in RPLC. Diffusivity across particles is then minimum. Based on the porosity of the particles accessible to analytes, it was accurately estimated from the elution times, the internal obstruction factor (using Pismen correlation), and the hindrance diffusion factor (using Renkin correlation). The columns used were packed with fully porous particles 2.5μm Luna-C18 100Å, core-shell particles 2.6μm Kinetex-C18 100Å, 3.6μm Aeris Widepore-C18 200Å, and prototype 2.7μm core-shell particles (made of two concentric porous shells with 100 and 300Å average pore size, respectively), and with 3.3μm non-porous silica particles. The results demonstrate that the porous particle structure and the solid-liquid mass transfer resistance have practically no effect on the column efficiency for small molecules. For them, the column performance depends principally on eddy dispersion (packing homogeneity), to a lesser degree on longitudinal diffusion (effective sample diffusivity along the packed bed), and only slightly on the solid-liquid mass transfer resistance (sample diffusivity across the particle). In contrast, for proteins, this third HETP contribution, hence the porous particle structure, together with eddy dispersion govern the kinetic performance of columns. Mass transfer kinetics of proteins was observed to be fastest for columns packed with core-shell particles having either a large core-to-particle ratio or having a second, external, shell made of a thin porous layer with large mesopores (200-300Å) and a high porosity (≃0.5-0.7). The structure of this external shell seems to speed up the penetration of proteins into the particles. A stochastic model of the penetration of bulky proteins driven by a concentration gradient across an infinitely thin membrane of known porosity and pore size is suggested to explain this mechanism. Yet, under retained conditions, surface diffusion speeds up the mass transfer into the mesopores and levels the kinetic performance of particles built with either one or two porous shells.

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KW - Column technology

KW - Core-shell particles

KW - Mass transferresistance

KW - Protein diffusivity

KW - Protein separation

KW - Resolution power

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