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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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Drug delivery methods like oral inhalation, nasal sprays, transdermal patches, eye drops, intravitreal injection,  and rectal administration provide localized effects with reduced toxicity.
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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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Drug Delivery: Enteral Route01:18

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The enteral drug administration involves three primary routes: oral, sublingual, and buccal. Oral ingestion is the most prevalent, safe, economical, and convenient method for drug administration. However, it has certain drawbacks, including limited absorption due to the drug's low water solubility or poor membrane permeability, possible emesis from GI mucosa irritation, destruction of drugs by digestive enzymes or low gastric pH, and irregular absorption along with food or other drugs.
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Polypeptide-based drug delivery systems for programmed release.

Xu Wang1, Ziyuan Song2, Shiqi Wei3

  • 1Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics (Theranostics), School of Pharmacy, Tianjin Medical University, Tianjin, 300070, PR China; Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, United States.

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|July 3, 2021
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Summary
This summary is machine-generated.

Synthetic polypeptides from N-carboxyanhydrides (NCAs) offer biocompatible drug delivery. Their structures enable programmed release, advancing next-generation therapeutics and diagnostics.

Keywords:
Drug delivery systemN-carboxyanhydridePolypeptideProgrammed releaseRing-opening polymerization

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Polypeptides are biocompatible materials with tunable properties.
  • Ring-opening polymerization of N-carboxyanhydrides (NCAs) is a key method for polypeptide synthesis.
  • Polypeptides self-assemble into nanostructures for biomedical applications.

Purpose of the Study:

  • To review polypeptide-based drug delivery systems synthesized via NCA chemistry.
  • To highlight designs for programmed drug release based on polypeptide structure.
  • To discuss future perspectives in polypeptide biomaterials for therapeutics and diagnostics.

Main Methods:

  • Review of literature on NCA polymerization and polypeptide self-assembly.
  • Analysis of polypeptide structure-property relationships for drug delivery.
  • Focus on molecular design for controlled and programmed release.

Main Results:

  • Polypeptides offer diverse functionalities and controlled assembly into nanostructures.
  • NCA chemistry enables precise control over polypeptide synthesis and properties.
  • Designed polypeptide architectures facilitate programmed drug release.

Conclusions:

  • Polypeptide-based drug delivery systems derived from NCA chemistry show significant promise.
  • Programmed release strategies enhance therapeutic efficacy and diagnostic capabilities.
  • This field is poised to impact next-generation therapeutics and diagnostics.