Related Experiment Video
Updated: Oct 9, 2025
07:26
Agarose Fluid Gels Formed by Shear Processing During Gelation for Suspended 3D Bioprinting
Published on: May 26, 2023
2.6K
Interaction between Negatively Charged Fish Gelatin and Cyclodextrin in Aqueous Solution: Characteristics and
Qi Fang1, Nao Ma1, Keying Ding1
1College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo 315800, China.
Gels (Basel, Switzerland)
|December 23, 2021
Summary
Fish gelatin (FG) and cyclodextrins (CDs) form stable complexes. Optimal ratios enhance gel strength and alter FG structure, suggesting applications in food matrices.
Area of Science:
- Food Science
- Biopolymer Chemistry
- Materials Science
Background:
- Fish gelatin (FG) is a valuable biopolymer with potential applications in food systems.
- Cyclodextrins (CDs) are known for their ability to form inclusion complexes with various molecules.
- Understanding the interactions between FG and CDs is crucial for developing novel food ingredients.
Purpose of the Study:
- To investigate the effect of different ratios of fish gelatin (FG) to α, β, and γ cyclodextrins (CDs) on the phase behavior of concentrated biopolymer mixtures.
- To explore the formation of FG-CD complexes and their impact on physical properties like gel strength, turbidity, particle size, and viscosity.
- To analyze the conformational changes in FG induced by CD complexation using fluorescence and FTIR spectroscopy.
Main Methods:
- Preparation of concentrated biopolymer mixtures with varying FG-CD ratios (90:10).
- Measurement of gel strength, turbidity, particle size, and ζ-potential.
- Rheological analysis to determine viscosity and flow behavior (pseudo-plasticity).
- Spectroscopic techniques (fluorescence and FTIR) to study FG conformation and intermolecular interactions.
Main Results:
- The highest gel strength was observed at an FG-CD ratio of 90:10.
- FG-CD complexes exhibited reduced turbidity, smaller particle size, and lower ζ-potential compared to FG alone.
- All FG-CD mixtures displayed pseudo-plastic behavior, with FG-αCD showing the highest viscosity.
- CDs induced unfolding of FG molecules, promoting transitions from random coil to β-turn structures, evidenced by increased fluorescence and altered secondary structures via FTIR.
Conclusions:
- Fish gelatin and cyclodextrins form stable complexes with tunable properties.
- The ratio of FG to CD significantly influences the gel strength and rheological behavior of the mixture.
- Complexation with CDs induces conformational changes in fish gelatin, impacting its structure and potentially its functionality.
- These findings provide valuable insights for the application of FG-CD complexes in designing advanced food matrices.
Related Concept Videos
02:21Chemical and Solubility Equilibria
4.3K
The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place,...
4.3K
03:22Colloids
18.6K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
18.6K
03:45Formation of Complex Ions
24.2K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
24.2K
01:09Colloidal precipitates
868
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...
868
01:06Coagulation
411
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
411
03:13Intermolecular Forces
62.4K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
62.4K