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Related Concept Videos

Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

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.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent – the...
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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...
Precipitation Processes01:12

Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism

Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
Urinary Tract Calculi III: Medical Management01:30

Urinary Tract Calculi III: Medical Management

The diagnosis of renal calculi involves several imaging techniques, including non-contrast CT scans and ultrasound. These methods help visualize kidney stones, assess their size and location, and detect possible obstructions. Additionally, Measuring urine pH is useful for diagnosing specific stone types, such as struvite (alkaline pH) and uric acid stones (acidic pH). Cystine stones are primarily linked to cystinuria, a genetic condition. A urinalysis helps detect blood in the urine (hematuria)...
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...

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Updated: May 31, 2026

Optimization of Crystal Growth for Neutron Macromolecular Crystallography
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Mechanistic Insights into Molecular Modifiers That Promote Urate Crystallization through Solute Assembly Regulation.

Qizan Chen1, Si Li2, Ryan Soucek1

  • 1Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States.

JACS Au
|May 29, 2026
PubMed
Summary

Riboflavin (RF) promotes ammonium urate crystal growth by reorganizing urate ions in solution. This solution-phase preassembly mechanism enhances crystal formation, offering new strategies for crystal engineering.

Keywords:
ammonium urate crystallizationcrystal growth modifiermolecular dynamics simulationmolecular self-assemblyriboflavin

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Area of Science:

  • Crystal engineering and materials science.
  • Biophysical chemistry and molecular interactions.

Background:

  • Crystallization modifier mechanisms, especially for growth promoters, are poorly understood.
  • Ammonium urate (NH4HU) crystallization is relevant to kidney stone formation.
  • Riboflavin (RF) is a known vitamin with potential crystallization modifying properties.

Purpose of the Study:

  • To elucidate the mechanism by which riboflavin (RF) promotes ammonium urate (NH4HU) crystal growth.
  • To identify key molecular interactions driving RF's growth promotion.
  • To design and validate RF derivatives with enhanced crystallization promotion capabilities.

Main Methods:

  • Combined microfluidic experiments and molecular dynamics simulations.
  • Analysis of ion conformations and solution-phase interactions.
  • Rational design and experimental validation of modified riboflavin derivatives.

Main Results:

  • Riboflavin (RF) induces growth-compatible coplanar conformations of urate ions in solution.
  • This solution-phase preassembly mechanism is distinct from classical crystal growth pathways.
  • RF derivatives, like lumichrome, showed enhanced NH4HU growth promotion (up to 40%) compared to RF (20%).

Conclusions:

  • Solution-phase preorganization is a viable mechanism for enhancing crystal growth.
  • The aromatic ring size of modifiers like RF is crucial for their growth promotion efficacy.
  • Rational design based on molecular interactions can yield improved crystallization promoters.