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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
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Updated: Mar 18, 2026

Growing Protein Crystals with Distinct Dimensions Using Automated Crystallization Coupled with In Situ Dynamic Light Scattering
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Quantitative Perspectives of Biomolecular Crystallization Kinetics.

Christo N Nanev1

  • 1Rostislaw Kaischew Institute of Physical Chemistry, Sofia, Bulgaria. nanev@ipc.bas.bg.

Advances in Biochemical Engineering/Biotechnology
|March 16, 2026
PubMed
Summary

Understanding biomolecular crystallization kinetics is crucial for controlling crystal properties like size and number. This study reviews nucleation and growth rates, experimental methods, and provides recommendations for optimizing crystal formation.

Keywords:
Classical nucleation theory (CNT)Experimental studies of biomolecular crystallizationPeculiarities of the biomolecular crystallizationRate of heterogeneous crystal nucleationRate of homogeneous crystal nucleationTwo-step mechanism of crystal nucleation

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Area of Science:

  • Biomolecular crystallization
  • Crystallization kinetics
  • Protein crystallization

Background:

  • Crystallization kinetics influences critical product characteristics such as crystal number, polydispersity, and crystal size distribution (CSD).
  • Biomolecular crystal nucleation and growth kinetics are generally slower than those of small molecules due to specific molecular surface interactions.

Purpose of the Study:

  • To provide a theoretical overview of homogeneous and heterogeneous crystal nucleation rates.
  • To discuss the mechanism and slower growth rate of biomolecular crystals.
  • To detail experimental methods for studying biomolecular crystal nucleation and growth kinetics.

Main Methods:

  • Theoretical review of nucleation rates, emphasizing the role of molecular surface binding patches.
  • Discussion of biomolecular crystal growth mechanisms and rates.
  • Detailed examination of experimental techniques for measuring nucleation rates (e.g., induction time, double-pulse technique) and growth rates, including apparatuses and quantitative estimations.

Main Results:

  • Biomolecular crystal nucleation is limited by specific binding patch interactions, resulting in slower kinetics compared to small molecules.
  • Biomolecular crystal growth rates are also slower than those of small molecule crystals.
  • Key experimental methods for measuring nucleation and growth rates are presented, along with quantitative data and comparisons.

Conclusions:

  • Understanding and controlling crystallization kinetics is vital for achieving desired biomolecular crystal characteristics.
  • The chapter provides a comprehensive guide to the kinetics, experimental methods, and optimization strategies for biomolecular crystallization.