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Updated: Aug 16, 2025
Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release
Published on: February 13, 2016
Preparation and characterization of morphine gelatine microspheres
Xin Jin1, Jun Ji1, Yonghai Sun2
1Anesthesiology Department, the Chinese PLA Air Force Medical Center, Beijing, Hebei, China.
Abstract:
Morphine is a widely used opioid analgesic. However, standard morphine dosages and administration methods exhibit a short half-life and pose a risk of respiratory depression. Sustained-release microspheres can deliver prolonged efficacy and reduce side effects. We present a new controlled-release morphine gelatine microsphere (MGM) prepared using an emulsification-crosslinking strategy. The gelatine microsphere design improves the bioavailability of morphine. And it not only increases the clinical analgesic efficacy but also the safety of clinical medication through a gradual, sustained release. Besides, we describe MGMs' preparation, release, pharmacodynamics, and pharmacokinetics. And the drug metabolism pathway. We calculate the release rate of morphine by measuring plasma morphine concentration over time and pharmacokinetic parameters. It optimized the manufacturing process of MGMs, which makes the analgesic effect have a longer duration. MGMs analgesic effect shows dose dependence. After they were administrated, MGMs were released more slowly. Peak concentration was reduced, and the relative bioavailability improved. It even reached 88.84%. Its pharmacokinetic process was consistent with the two-component first-order absorption model. MGMs deliver sustained-release and long-action pharmacokinetics. It shows design goals of improving drug bioavailability, prolonging drug residence time in vivo, and maintaining stable blood drug concentration.
Insights
New morphine gelatine microspheres (MGMs) offer sustained release, improving pain relief efficacy and safety. This controlled-release formulation enhances morphine bioavailability and prolongs its effects, reducing risks associated with standard dosages.
Area of Science:
- Pharmacology
- Biomaterials Science
- Drug Delivery Systems
Background:
- Standard morphine administration has a short half-life and risks respiratory depression.
- Sustained-release formulations can improve efficacy and reduce side effects of analgesics.
- Morphine gelatine microspheres (MGMs) offer a novel approach to controlled drug delivery.
Purpose of the Study:
- To develop and characterize a controlled-release morphine gelatine microsphere (MGM) formulation.
- To evaluate the preparation, release kinetics, pharmacodynamics, and pharmacokinetics of MGMs.
- To assess the potential of MGMs to improve morphine bioavailability and clinical safety.
Main Methods:
- MGMs were prepared using an emulsification-crosslinking strategy.
- Morphine release rates were determined by measuring plasma concentrations over time.
- Pharmacokinetic and pharmacodynamic parameters were analyzed, including bioavailability and drug metabolism.
Main Results:
- The MGM formulation demonstrated sustained release of morphine, reducing peak plasma concentrations.
- Relative bioavailability of morphine was significantly improved, reaching 88.84%.
- The pharmacokinetic profile was consistent with a two-component first-order absorption model, indicating prolonged in vivo residence time.
Conclusions:
- MGMs provide sustained-release and long-action pharmacokinetics for morphine.
- The developed formulation enhances drug bioavailability, prolongs residence time, and maintains stable blood concentrations.
- MGMs represent a promising strategy for improving the clinical efficacy and safety of morphine analgesia.
