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相关概念视频

Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

Modified-Release Drug Delivery Systems: Rate-Programmed II

Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
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Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...
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Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...
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Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...

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从可降解的PEG水凝中设计的零顺序药物释放 - - 拉巴胺案例研究.

Lage Ahrenstedt1, Anel Oosthuysen1, Peter Zilla1

  • 1Cardiovascular Research Unit, University of Cape Town, Cape Town, South Africa.

Journal of biomaterials applications
|January 6, 2026
PubMed
概括

研究人员修改了Rapamycin (Ra) 以控制药物输送,制造出在7-19天内释放Ra的水凝. 链接器附近的结构变化对释放率产生了重大影响,为先进的药物输送系统提供了洞察力.

关键词:
通过PEGylation进行化.药物输送是药物输送的过程.这种水凝是水凝.这种药物是拉帕米辛 (Rapamycin).释放动力学释放动力学零级化剂的排泄是零级的

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科学领域:

  • 生物材料科学 生物材料科学
  • 聚合物化学 聚合物化学
  • 药物运输 药物运输 药物运输

背景情况:

  • 控制药物释放系统对于治疗疗效至关重要.
  • 拉巴胺素 (Ra) 是一种强大的免疫抑制剂,具有狭窄的治疗窗口.
  • 基于水凝的药物输送提供了持续释放的潜力.

研究的目的:

  • 为了合成和描述用于控制药物释放的拉巴素结合基.
  • 为了研究乙烯链体结构对药物释放动态的影响.
  • 为了探索水凝架构对拉帕米辛化配置文件的影响.

主要方法:

  • 拉帕米辛与烯酸和酸的衍生.
  • 修改后的拉帕米辛与化聚乙烯糖醇 (PEG) 的结合.
  • 通过使用多臂PEG巨和化PEG交叉连接剂通过结合添加形成水凝.
  • 在生理条件下的体外药物释放研究.

主要成果:

  • 在7-19天内观察到零级拉巴胺素释放,可通过水凝结构调节.
  • 与β-thioether相比,α-thioether链表现出更快的水解和释放 (11-31%的增加).
  • 促进胀和降解的水凝 (PEG烯酸盐) 呈现出更高的药物释放率.
  • 基于Ra的交叉连接导致了两相释放:最初的零顺序,然后是爆发阶段.

结论:

  • 水凝的设计,特别是乙烯链结构,显著调节了拉巴胺释放动力学.
  • 乙烯组的电子吸收效应加快了的水解和药物释放.
  • 这些发现为设计针对量身定制的可控药物输送应用的先进水凝提供了基础.