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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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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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Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
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Oral drug delivery is the most common route of administration due to its convenience, cost-effectiveness, and high patient compliance. It enables precise formulation to ensure proper drug dosage and bioavailability. The development of oral dosage forms considers drug properties such as solubility, stability, and absorption to optimize therapeutic efficacy.Tablets, capsules, liquids, and chewable formulations enhance drug stability, mask undesirable tastes, and improve patient experience.
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Continuous-release drug delivery systems offer a strategic approach to maintaining therapeutic drug levels over extended periods following oral administration. By modulating the release rate of active pharmaceutical ingredients, these systems minimize fluctuations in plasma concentrations, which enhances clinical efficacy and reduces the need for frequent dosing. Such characteristics make them particularly advantageous in managing chronic diseases where patient adherence and stable drug...
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Delayed-release drug delivery systems are specialized pharmaceutical formulations designed to postpone the release of active compounds until the drug reaches a specific region of the gastrointestinal (GI) tract, typically the intestine. These systems are essential for drugs that may cause gastric irritation, are unstable in acidic environments, or need to exert therapeutic effects locally in the intestinal or colonic regions.The core feature of delayed-release systems is the use of enteric...

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完全可生物降解的基于弹性体的装置用于口服巨分子输送.

Reece McCabe1, Lasse Højlund Eklund Thamdrup1, Mahdi Ghavami1

  • 1The Danish National Research Foundation and Villum Foundation's Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Health Technology, Technical University of Denmark, 2800 Kgs Lyngby, Denmark.

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概括

研究人员开发了一种可生物降解的弹性体,聚乙酸 (POC),用于口服药物输送装置. 这种可持续材料对创建先进的薄膜类型设备来增强宏分子传递有希望.

关键词:
可生物降解的弹性体弹性体大分子分子是巨分子.口腔器械是一种口腔器械.口服药物输送是通过口服药物进行的.一个聚合物聚合物.

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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
  • 药物输送系统 药物输送系统

背景情况:

  • 片类型的口腔器械有可能通过单向释放在肠道中传递透性较差的宏分子.
  • 当前薄膜类型设备的一个主要局限性是使用非生物降解弹性体,这对环境造成了担忧.

研究的目的:

  • 为了合成和表征一种新的生物降解弹性体,用于制造环保的薄膜类型口服药物递送装置.
  • 评估由新材料制成的设备的机械性能,表面特性和药物释放性能.

主要方法:

  • 通过单反应合成聚甲醇酸盐 (POC).
  • 微尺度的图案复制使用造创建片类型的设备结构.
  • 机械测试 (弹性模量,故障时的应变),表面自由能量评估和降解研究.
  • 用乙氨基加载设备,肠道涂层,以及在模拟胃和肠液中进行体外药物释放测试.

主要成果:

  • 合成的POC弹性体表现出适当的机械性能 (弹性模量高达2.2MPa,故障时应变高达110%).
  • 在模拟生理条件下,装有乙氨基的肠道涂层设备在2.5小时内完全释放药物.
  • 该材料在表面自由能量和降解行为方面表现出有希望的特性.

结论:

  • 聚乙酸 (POC) 是一种可行的可生物降解替代品,用于用于型口服药物递送装置的非生物降解弹性体.
  • 开发的材料和设备制造方法支持药品的可持续和有效交付.
  • 需要进行进一步的研究,以探索基于POC的设备在巨分子输送方面的全部潜力.