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Related Concept Videos

Micelles01:30

Micelles

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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
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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...
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pH-responsive micelles based on caprylic acid.

Stefan Salentinig1, Stephanie Phan, Tamim A Darwish

  • 1Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus) , 381 Royal Parade, Parkville, VIC 3052, Australia.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 7, 2014
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Summary
This summary is machine-generated.

This study reveals that medium-chain triglyceride digestion products form pH-responsive colloidal structures. Micelle size and shape change with pH, impacting caprylic acid distribution for better lipid delivery.

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Area of Science:

  • Biochemistry
  • Colloid Science
  • Physical Chemistry

Background:

  • Free fatty acids are crucial for cellular energy and lipid metabolism.
  • Triglyceride hydrolysis yields amphiphilic free fatty acids and monoglycerides, essential for lipid transport.
  • Bile salts aid in transporting lipids and hydrophobic molecules from the intestine.

Purpose of the Study:

  • To investigate the pH-responsive self-assembly of medium-chain triglyceride digestion products.
  • To understand the colloidal structure formation and transformation during lipid digestion.
  • To elucidate the role of pH in the delivery of triglyceride lipids and hydrophobic molecules.

Main Methods:

  • Small-angle X-ray and neutron scattering were employed.
  • Solvent contrast variation and selective deuteration were used to map caprylic acid distribution.
  • Scattering data was modeled to analyze micelle transitions.

Main Results:

  • Mixed colloidal structures formed from medium-chain triglycerides (tricaprylin), bile salt, and phospholipid showed high pH responsiveness.
  • Increasing pH induced transitions in micelle size and shape.
  • Caprylic acid shifted from the micelle core to the shell or bulk water as pH increased.

Conclusions:

  • The pH-dependent colloidal behavior influences the delivery of lipids and hydrophobic compounds.
  • Understanding these transformations is key to optimizing nutrient and drug delivery systems.
  • This research provides insights into the colloidal dynamics of lipid digestion.