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Colloidal precipitates

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Optimized Isolation of White Tea Infusion Micro-Nanoparticles and Stability Mechanism: A

Yuan Sun¹, Chuyu Ye¹, Fei Xu¹

¹College of Food Science and Engineering, Ocean University of China, Qingdao 266404, China.

Foods (Basel, Switzerland)

|May 4, 2026

Summary

Researchers optimized white tea infusion micro-nanoparticles (WTMPs) isolation using ultrafiltration-centrifugation. The study reveals WTMPs possess enhanced stability and a remodeled composition, with enriched gallic acid (GA) and reduced caffeine (CAF).

Keywords:

TOPSIS molecular dynamics multi-spectroscopic analysis stability white tea micro-nanoparticles

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Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization

Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization

Published on: December 25, 2017

Area of Science:

Food Science
Colloid Science
Biophysics

Background:

White tea infusion micro-nanoparticles (WTMPs) are crucial for colloidal stability.
Optimal isolation strategies and stability mechanisms for WTMPs are not well understood.

Purpose of the Study:

To optimize the isolation of WTMPs using ultrafiltration-centrifugation.
To elucidate the composition-structure-stability relationship of isolated WTMPs.
To understand the roles of gallic acid (GA) and caffeine (CAF) in WTMP stability.

Main Methods:

Multi-indicator TOPSIS strategy for optimizing ultrafiltration-centrifugation parameters (100 kDa membrane, 3000× g, 20 min).
Characterization of isolated WTMPs using spectroscopy.
Molecular dynamics simulations to investigate molecular interactions.

Main Results:

Optimized isolation yielded WTMPs with remodeled composition, regular morphology, ordered structure, and improved stability.
Gallic acid (GA) was selectively enriched, while caffeine (CAF) content decreased significantly.
GA promotes cooperative interfacial stabilization, whereas CAF acts as a local ligand in the protein-polysaccharide network.

Conclusions:

Established an optimal method for isolating stable WTMPs with enhanced properties.
Demonstrated a clear link between WTMP composition, structure, and environmental stability.
Provided mechanistic insights into the stabilization roles of GA and CAF in white tea systems.