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Factors Influencing Drug Absorption: Physicochemical Parameters01:22

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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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A drug's physicochemical properties fundamentally influence its metabolism. For instance, a drug's molecular size and shape critically determine its interaction with enzymes and transporters — larger drugs may face difficulty reaching enzyme active sites, altering their metabolic pathways. The pKa of a drug, which establishes its ionization state, can impact its solubility and absorption, thereby influencing metabolism.
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Impact Loading01:19

Impact Loading

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Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
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Factors Affecting Renal Clearance: Drug's Physicochemical Properties and Plasma Levels01:31

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Renal clearance of a drug is influenced by various factors, including its physicochemical properties and plasma levels. These factors play a significant role in determining how efficiently the kidneys eliminate a drug.
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Distributed Loads01:19

Distributed Loads

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Distributed loads are a common type of load that engineers and scientists encounter in various practical situations. Distributed loads often refer to a type of load spread over a surface or a structure and can be modeled as continuous force per unit area.
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Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
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Targeting Drugs to Larval Zebrafish Macrophages by Injecting Drug-Loaded Liposomes
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Temoporfin-loaded liposomes: physicochemical characterization.

Judith Kuntsche1, Ines Freisleben, Frank Steiniger

  • 1Department of Pharmaceutical Technology, Friedrich-Schiller-University Jena, Lessingstr. 8, D-07743 Jena, Germany. judith.kuntsche@pharmazie.uni-halle.de

European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences
|April 24, 2010
PubMed
Summary
This summary is machine-generated.

Temoporfin (mTHPC) liposomes were developed to improve drug delivery. Drug incorporation altered liposome thermal behavior, with longer fatty acid chains maintaining stability above body temperature.

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Area of Science:

  • Pharmaceutical Sciences
  • Drug Delivery Systems
  • Photodynamic Therapy

Background:

  • Temoporfin (mTHPC) is a hydrophobic photosensitizer used in photodynamic therapy for head and neck cancer.
  • The commercial formulation (Foscan) has limitations due to its solvent mixture.
  • Liposomes are explored as a carrier system to improve temoporfin delivery.

Purpose of the Study:

  • To characterize liposome formulations containing temoporfin.
  • To investigate the influence of temoporfin incorporation on liposome thermal phase behavior.
  • To compare conventional and "stealth" liposomes for temoporfin delivery.

Main Methods:

  • Preparation of conventional and pegylated liposomes with varying lipid compositions.
  • Physicochemical characterization using photon correlation spectroscopy, differential scanning calorimetry, and cryo-electron microscopy.
  • Evaluation of drug incorporation effects on liposome thermal properties and morphology.

Main Results:

  • Temoporfin incorporation concentration-dependently decreased liposome phase transition temperatures.
  • Liposomes with shorter fatty acid chains (DPPC/DPPG) showed phase transitions near or below body temperature.
  • Liposomes with longer fatty acid chains (DSPC/DSPG) maintained phase transitions well above body temperature, even at high drug loads.
  • Pegylated lipids did not significantly alter size or thermal behavior but indicated micellar structures.
  • Lyophilization and reconstitution affected morphology but not colloidal stability.

Conclusions:

  • Liposome composition, particularly fatty acid chain length, is critical for maintaining thermal stability with temoporfin.
  • Liposomes with longer acyl chains offer a promising approach for stable temoporfin delivery.
  • Further investigation into pegylated liposomes may reveal potential for enhanced drug delivery.