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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

139
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...
139
Modified-Release Drug Delivery Systems: Classification01:23

Modified-Release Drug Delivery Systems: Classification

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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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Modified-Release Drug Delivery Systems: Rate-Programmed I01:22

Modified-Release Drug Delivery Systems: Rate-Programmed I

174
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,...
174
Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

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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...
184

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基于金属-有机框架的自拆卸宏孔微电机,具有磁控运动,用于连续释放药物.

Javier Bujalance Fernández1, Víctor de la Asunción-Nadal1, Beatriz Jurado Sánchez1,2

  • 1Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Universidad de Alcala, Alcala de Henares, Madrid, E-28802, Spain.

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概括

这项研究引入了磁性微电机 (MMs) 用于连续递送药物. 这些MM携带两种癌症药物,根据pH值变化以不同的速度释放它们,改善向癌症治疗.

关键词:
5 - - 甲是一种5 - - 甲.癌细胞 癌细胞 癌细胞送货 送货 送货 送货 送货 送货德克索鲁比辛 (doxorubicin) 是一种药物.泽奥利特性意达的框架.

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科学领域:

  • 纳米技术 纳米技术
  • 材料科学 材料科学 材料科学
  • 生物医学工程 生物医学工程

背景情况:

  • 开发先进的药物输送系统对于有效的癌症治疗至关重要.
  • 金属有机框架 (MOF) 为药物封装提供可调节的特性.
  • 磁纳米颗粒使得治疗剂的向输送和受控运动成为可能.

研究的目的:

  • 为了合成基于宏的焦利性伊米达框架 (ZIF) 的磁性微电机 (MMs).
  • 为了实现双封装和pH触发的5 - 甲 (5-FU) 和多克索鲁比 (DOX) 的连续释放.
  • 使用这些MMs来证明向药物递送和癌细胞相互作用.

主要方法:

  • 在甲醇溶液中使用超偏磁铁氧化物纳米粒子 (Fe3O4) 合成MMs.
  • 5-FU (在巨孔结构内) 和DOX (在表面) 的双重封装.
  • 使用Caco-2细胞进行体外试验,以评估药物释放和细胞效应.

主要成果:

  • 对于5-FU (72.8μg/mg) 和DOX (3μg/mg) 的高负载能力.
  • 酸性pH触发了DOX的快速释放和5-FU的持续释放,这是由于ZIF-8的降解.
  • 在试验室中,已证明有针对性的输送和减少癌细胞活力.

结论:

  • 开发的MMs代表了一种新的pH敏感,磁导系统,用于连续的双重药物输送.
  • 这种方法为增强癌症化疗提供了一个有希望的策略,具有可控药物释放动力学.
  • 这是第一个基于磁性MOF的MM,能够连续释放两个药物的pH触发释放.