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Bioavailability Enhancement: Drug Stability Enhancement and GI Retention01:05

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Body:Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...
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Factors Influencing Drug Absorption: Pharmaceutical Parameters01:28

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Solid dosage forms such as tablets and capsules undergo rigorous manufacturing processes to ensure stability and effectiveness. Their dissolution and absorption properties are influenced significantly by the choice of excipients (inactive ingredients that serve various roles in the formulation), and the methodology applied during production. The manufacturing parameters, such as compression force and granulation techniques, significantly affect dissolution rates. Elevated compression forces...
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Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...
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The selection of a drug's delivery route depends upon its physicochemical properties, including lipid or water solubility and ionization, as well as the therapeutic requirement, such as immediate or sustained effect. These routes can be divided into three primary categories: enteral, parenteral, and topical.
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Body:After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt...
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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Drug Delivery

Background:

  • Polysaccharides are abundant natural polymers with desirable properties for biomedical applications.
  • They exhibit biocompatibility, biodegradability, and low immunogenicity, making them attractive for drug delivery.
  • Their chemical and enzymatic modifiability allows for the design of "smart" drug delivery systems.

Purpose of the Study:

  • To review strategies for utilizing crosslinked polysaccharides in controlled drug delivery.
  • To explore various forms of polysaccharide-based drug delivery systems, including conjugates, hydrogels, aerogels, and nanoparticles.

Main Methods:

  • Examination of crosslinking techniques for single polysaccharides, mixtures, and natural-synthetic hybrids.
  • Analysis of polysaccharide-drug conjugates for targeted therapeutic delivery.
  • Review of drug encapsulation within polysaccharide-based hydrogels and aerogels.
  • Investigation of self-assembly mechanisms for polysaccharide drug-loaded nanoparticles.

Main Results:

  • Crosslinking enhances the stability and functionality of polysaccharide-based drug delivery systems.
  • Polysaccharide-drug conjugates offer precise control over drug release kinetics.
  • Hydrogels and aerogels provide effective matrices for encapsulating therapeutic agents.
  • Self-assembled nanoparticles demonstrate potential for targeted and efficient drug delivery.

Conclusions:

  • Crosslinked polysaccharides are highly promising materials for developing advanced, controlled drug delivery platforms.
  • Diverse strategies, including conjugation, encapsulation, and self-assembly, leverage polysaccharide properties for effective therapeutics.
  • Further research into these biodegradable polymers will advance smart drug delivery system design.