Non-linear behaviour of lysozyme crystallization

C. Piccolo, M. Lappa, A. Tortora, L. Carotenuto

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A crystallisation process of biological macromolecules in gel-matrix was studied by Mach-Zehnder interferometer and the results were compared with a numerical model of periodic precipitation. This investigation is focused on the coupling between transport phenomena, nucleation and crystal growth, which may lead to non-linear behaviour.
In general, transport phenomena involve double diffusion of the two main solutes (protein and precipitant agent) and buoyant convection that may arise due to density gradients in the liquid. Both transport conditions were addressed.
In absence of convection, in pure diffusive regime, non-uniform crystal distributions have been observed. The results can be described in terms of a modulation in space and in time of supersaturation that leads to a nucleation front that propagates inside the protein solution. The experimental data are in good agreement with numerical simulations.
When convection is not negligible, it leads to a deformation of the diffusive solutal distribution, characterised by a periodic wave-like pattern observed by interferometry. The observed instabilities are driven by double diffusion and agree with a stability model of double diffusive systems.
LanguageEnglish
Pages636 - 645
Number of pages10
JournalPhysica A: Statistical Mechanics and its Applications
Volume314
Issue number1-4
DOIs
Publication statusPublished - 30 Nov 2002

Fingerprint

lysozyme
Crystallization
Convection
Transport Phenomena
convection
crystallization
Nucleation
nucleation
proteins
Protein
Mach-Zehnder Interferometer
Periodic Wave
Crystal Growth
Mach-Zehnder interferometers
Interferometry
supersaturation
macromolecules
crystal growth
solutes
interferometry

Keywords

  • crystallisation
  • periodic precipitation
  • gravity
  • convection
  • sedimentation
  • Lysozyme crystallisation
  • biological macromolecules
  • numerical model
  • double diffusion
  • buoyant convection

Cite this

Piccolo, C. ; Lappa, M. ; Tortora, A. ; Carotenuto, L. / Non-linear behaviour of lysozyme crystallization. In: Physica A: Statistical Mechanics and its Applications. 2002 ; Vol. 314, No. 1-4. pp. 636 - 645.
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Non-linear behaviour of lysozyme crystallization. / Piccolo, C.; Lappa, M.; Tortora, A.; Carotenuto, L.

In: Physica A: Statistical Mechanics and its Applications, Vol. 314, No. 1-4, 30.11.2002, p. 636 - 645.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Non-linear behaviour of lysozyme crystallization

AU - Piccolo, C.

AU - Lappa, M.

AU - Tortora, A.

AU - Carotenuto, L.

PY - 2002/11/30

Y1 - 2002/11/30

N2 - A crystallisation process of biological macromolecules in gel-matrix was studied by Mach-Zehnder interferometer and the results were compared with a numerical model of periodic precipitation. This investigation is focused on the coupling between transport phenomena, nucleation and crystal growth, which may lead to non-linear behaviour.In general, transport phenomena involve double diffusion of the two main solutes (protein and precipitant agent) and buoyant convection that may arise due to density gradients in the liquid. Both transport conditions were addressed.In absence of convection, in pure diffusive regime, non-uniform crystal distributions have been observed. The results can be described in terms of a modulation in space and in time of supersaturation that leads to a nucleation front that propagates inside the protein solution. The experimental data are in good agreement with numerical simulations.When convection is not negligible, it leads to a deformation of the diffusive solutal distribution, characterised by a periodic wave-like pattern observed by interferometry. The observed instabilities are driven by double diffusion and agree with a stability model of double diffusive systems.

AB - A crystallisation process of biological macromolecules in gel-matrix was studied by Mach-Zehnder interferometer and the results were compared with a numerical model of periodic precipitation. This investigation is focused on the coupling between transport phenomena, nucleation and crystal growth, which may lead to non-linear behaviour.In general, transport phenomena involve double diffusion of the two main solutes (protein and precipitant agent) and buoyant convection that may arise due to density gradients in the liquid. Both transport conditions were addressed.In absence of convection, in pure diffusive regime, non-uniform crystal distributions have been observed. The results can be described in terms of a modulation in space and in time of supersaturation that leads to a nucleation front that propagates inside the protein solution. The experimental data are in good agreement with numerical simulations.When convection is not negligible, it leads to a deformation of the diffusive solutal distribution, characterised by a periodic wave-like pattern observed by interferometry. The observed instabilities are driven by double diffusion and agree with a stability model of double diffusive systems.

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KW - periodic precipitation

KW - gravity

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KW - sedimentation

KW - Lysozyme crystallisation

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KW - numerical model

KW - double diffusion

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