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Colloidal precipitates01:09

Colloidal precipitates

642
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...
642

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An efficient method for improving the stability of Monascus pigments using ionic gelation.

Mengru Wei1,2, Jingjing Zhu2, Hongshuai Gao2,3

  • 1College of Chemistry and Molecular Sciences, Henan University, Kaifeng, China.

Journal of the Science of Food and Agriculture
|May 4, 2023
PubMed
Summary
This summary is machine-generated.

Encapsulating Monascus pigments (Mps) using sodium alginate and sodium caseinate improved their stability against heat, pH, and light. This ionic gelation method offers a promising way to protect these valuable natural colorants.

Keywords:
Monascus pigmentsencapsulationionic gelation methodstability

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Area of Science:

  • Food Science
  • Biotechnology
  • Materials Science

Background:

  • Monascus pigments (Mps) are susceptible to degradation from heat, pH, and light.
  • Developing stable Mps is crucial for their application in food and other industries.
  • Encapsulation offers a potential solution to enhance Mps stability.

Purpose of the Study:

  • To encapsulate Monascus pigments (Mps) using sodium alginate (SA) and sodium caseinate (SC) via ionic gelation.
  • To optimize the SA/SC ratio for maximum encapsulation efficiency and suitable particle size.
  • To evaluate the enhanced stability of encapsulated Mps against various environmental factors.

Main Methods:

  • Ionic gelation using sodium alginate, sodium caseinate, and CaCl2.
  • Preparation of Mps encapsulated in SA/SC gel beads at different ratios (1/4, 2/3, 3/2, 4/1).
  • Assessment of encapsulation efficiency, particle size, and stability under heat, pH, light, and storage conditions.

Main Results:

  • The optimal SA/SC ratio of 2/3 yielded high encapsulation efficiency (74.30%) and small particle size (2.02 mm).
  • Encapsulated Mps exhibited significantly reduced degradation rates under heat and improved stability across different pH levels.
  • Encapsulation increased Mps retention efficiency by 22.01% under UV light after seven days and improved storage stability.

Conclusions:

  • AC2 gel beads effectively enhance the stability of Monascus pigments.
  • The ionic gelation method using SA/SC is a viable strategy for stabilizing Mps.
  • This approach holds promise for preserving Mps in various applications, improving their shelf-life and performance.