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Related Concept Videos

Bioavailability Enhancement: Drug Stability Enhancement and GI Retention01:05

Bioavailability Enhancement: Drug Stability Enhancement and GI Retention

143
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...
143

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Biodegradable pH-responsive hydrogels for controlled dual-drug release.

Liang Xu1, Linzi Qiu, Yang Sheng

  • 1Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China. rzhang@cczu.edu.cn.

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|April 8, 2020
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This summary is machine-generated.

New pH-responsive hydrogels deliver anti-cancer and anti-bacterial drugs with controlled release. These biocompatible hydrogels show significant volume changes with pH and tunable biodegradability, degrading within two weeks.

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Area of Science:

  • Biomaterials Science
  • Drug Delivery Systems
  • Polymer Chemistry

Background:

  • Developing effective drug delivery systems is crucial for treating complex diseases like cancer and bacterial infections.
  • pH-responsive materials offer targeted drug release, minimizing side effects and improving therapeutic efficacy.
  • Hydrogels provide a versatile platform for encapsulating and delivering therapeutic agents.

Purpose of the Study:

  • To engineer dual-drug loaded, pH-responsive hydrogels for controlled release of anti-cancer and anti-bacterial agents.
  • To investigate the impact of varying poly(l-lactide) molecular weights on hydrogel properties.
  • To characterize the pH-triggered swelling, drug release kinetics, biodegradability, and biocompatibility of the developed hydrogels.

Main Methods:

  • Synthesis of poly(l-lactide)-co-polyethyleneglycol-co-poly(l-lactide) dimethacrylates with varying l-lactide oligomer molecular weights.
  • Copolymerization with acrylic acid and N-isopropylacrylamide to form pH-responsive hydrogels.
  • Characterization of hydrogel swelling behavior, mechanical properties, biocompatibility (cytotoxicity assays), biodegradability, and in vitro drug release profiles at different pH values (1.2 and 7.4).

Main Results:

  • Hydrogels exhibited significant reversible volume reduction (>80%) at pH 1.2 compared to pH 7.4.
  • The hydrogels demonstrated excellent biocompatibility, showing no toxicity to cells.
  • Differential release of tetracycline over doxorubicin was observed at pH 1.2, while equal release occurred at pH 7.4.
  • Biodegradability was tunable by adjusting crosslinking density and pH, with complete degradation within 2 weeks at pH 7.4 for optimal formulations.

Conclusions:

  • The developed dual-drug loaded hydrogels are effective pH-responsive delivery systems for combined anti-cancer and anti-bacterial therapy.
  • The tunable properties, including controlled drug release and biodegradability, make these hydrogels promising for biomedical applications.
  • The hydrogels' pH-dependent behavior and biocompatibility support their potential for targeted and safe drug delivery.