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

Modified-Release Drug Delivery Systems: Rate-Programmed I

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

Modified-Release Drug Delivery Systems: Stimuli-Activated

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...
Modified-Release Drug Delivery Systems: Site-Targeted01:24

Modified-Release Drug Delivery Systems: Site-Targeted

Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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...
Transdermal Drug Delivery Systems01:18

Transdermal Drug Delivery Systems

Transdermal drug delivery systems (TDDS) enable the controlled release of drugs across the skin into systemic circulation. They are particularly advantageous for drugs with short half-lives or narrow therapeutic indices, as they maintain consistent plasma concentrations and reduce the risk of subtherapeutic or toxic levels.TDDS are categorized into monolithic, reservoir, and mixed systems. Monolithic systems embed the drug in a polymer matrix, where diffusion governs release. Reservoir systems...

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光で活性化された自己発熱型ジャヌスナノプロペラ.

Henri Truong1, Chiara Moretti2, Lionel Buisson1

  • 1Univ. Bordeaux, CNRS, Centre de Recherche Paul-Pascal (CRPP), UMR 5031, 115 Avenue Schweitzer, F-33600 Pessac, France. eric.grelet@crpp.cnrs.fr.

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|February 17, 2026
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まとめ

研究者は,制御されたナノスケール運動のための燃料なし,光活性化された金-シリカジャヌスナノ粒子を実証しました. この突破は,ブラウン運動の課題を克服し,ナノ科学とナノ医療のアプリケーションのための活性物質の正確な操作を可能にします.

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科学分野:

  • 活性物質物理学 活性物質物理学
  • ナノテクノロジー ナノテクノロジー
  • 軟質物質科学とは,軟質物質科学である.

背景:

  • 流体内のナノスケールの制御された輸送は,熱の変動 (ブラウン運動) によって妨げられます.
  • 既存の方法は,ナノメートルサイズの粒子の誘導運動に十分なエネルギーを与えるのに苦労しています.
  • ブラウンの拡散を克服することは,ナノ科学とナノ医療の応用にとって極めて重要です.

研究 の 目的:

  • 光学刺激を用いた金-シリカジャヌスナノ粒子の燃料なし,調整可能,および可逆の活性運動を実証する.
  • ナノスケールでの光誘導自己熱泳の実験的証拠を提供すること.
  • 活性物質の研究と操作のための最小限の光熱システムを確立する.

主な方法:

  • 金-シリカ (Au-SiO2) ジャヌスナノ粒子の合成 (R ≈ 33 nm).
  • ナノ粒子の軌道を分析するために単一粒子の追跡技術を活用する.
  • ナノ粒子活動を誘発および制御するための光学刺激.

主要な成果:

  • Au-SiO2 ジャヌスナノ粒子の燃料なし,可逆,調整可能な活性行動が実証されました.
  • 自己熱泳の直接的な実験的証拠を提供し,活発な運動とブラウンの拡散を区別した.
  • ナノスケール活性物質操作のための実行可能なシステムとして光駆動ナノ粒子を展示しました.

結論:

  • 光活性化されたジャヌスナノ粒子は,制御されたナノスケール輸送のための新しい解決策を提供します.
  • 自己熱泳は,ナノスケールでのブラウン運動を克服するためのメカニズムを提供します.
  • これらの光熱システムは,活性物質とナノ医療における基礎研究と応用に有望である.