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Related Concept Videos

Surface Active Agents01:27

Surface Active Agents

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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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Micelles01:30

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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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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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The physicochemical characteristics of drugs play a crucial role in formulating stable and bioavailable drug products. The solubility of a drug, governed by the varying pH along the GI tract and its dissociation constant (pKa), is pivotal in determining its ionization state and absorption rate. Notably, weak acids and bases remain unionized and are absorbed more rapidly.
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Solutions of Gases in Liquids
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Flavonoid-surfactant interactions: A detailed physicochemical study.

Onkar Singh1, Rajwinder Kaur1, Rakesh Kumar Mahajan1

  • 1Department of Chemistry, UGC-centre for Advanced Studies-II, Guru Nanak Dev University, Amritsar-143005, India.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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This study explores how flavonoids like quercetin and kaempferol interact with surfactants AOT and NaDEHP. Flavonoids show enhanced antioxidant activity in NaDEHP micelles, suggesting their location influences behavior.

Keywords:
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Area of Science:

  • Physical Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Flavonoids are natural antioxidants with potential therapeutic applications.
  • Understanding their behavior in solution, particularly in organized media like micelles, is crucial for optimizing their function.
  • Surfactants form micelles that can alter the properties and activity of encapsulated molecules.

Purpose of the Study:

  • To investigate the interactions between specific flavonoids (quercetin, kaempferol) and anionic surfactants (AOT, NaDEHP).
  • To determine the location of these flavonoids within surfactant micelles.
  • To correlate flavonoid location with their antioxidant behavior and micellar properties.

Main Methods:

  • Surface tension measurements to study micellar and interfacial behavior.
  • UV-visible, fluorescence, and differential pulse voltammetry (DPV) for probing flavonoid location.
  • Dynamic light scattering (DLS) to confirm flavonoid solubilization and aggregate size.
  • Assessing radical scavenging activity (RSA) and degradation kinetics.

Main Results:

  • Flavonoid solubilization within AOT and NaDEHP aggregates was confirmed by DLS.
  • UV-visible, fluorescence, and DPV provided insights into the probable location of flavonoids within the micelles.
  • Both radical scavenging activity (RSA) and degradation rate constants (k) for flavonoids were higher in NaDEHP micelles compared to AOT micelles.

Conclusions:

  • The location of flavonoids within surfactant micelles significantly impacts their antioxidant behavior.
  • NaDEHP micelles provide a microenvironment that enhances the radical scavenging activity and stability of quercetin and kaempferol.
  • This research offers a pathway for controlling flavonoid antioxidant properties through micellar encapsulation.