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相关概念视频

Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
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Factors Influencing Drug Absorption: Physicochemical Parameters01:22

Factors Influencing Drug Absorption: Physicochemical Parameters

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The physicochemical characteristics of drugs play a crucial role in formulating stable and bioavailable drug products. The solubility of a drug, governed by the varying pH along the GI tract and its dissociation constant (pKa), is pivotal in determining its ionization state and absorption rate. Notably, weak acids and bases remain unionized and are absorbed more rapidly.
Enhanced drug absorption can be achieved by reducing particle sizes and increasing surface areas, thereby facilitating...
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Drug Delivery: Overview01:16

Drug Delivery: Overview

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The selection of a drug's delivery route depends upon its physicochemical properties, including lipid or water solubility and ionization, as well as the therapeutic requirement, such as immediate or sustained effect. These routes can be divided into three primary categories: enteral, parenteral, and topical.
Enteral delivery involves administering drugs directly through swallowing, sublingual placement, or buccal application. Orally administered drugs predominantly navigate the...
274
Drug Delivery: Parenteral Route01:29

Drug Delivery: Parenteral Route

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The parenteral route is a critical method of drug administration. It delivers compounds directly into the systemic circulation and bypasses the gastrointestinal tract. This approach is particularly advantageous for drugs that exhibit poor absorption or instability when administered orally.
There are three primary parenteral routes: intravenous (IV), intramuscular (IM), and subcutaneous (SC). The IV route introduces the drug directly into the bloodstream, ensuring immediate action. The IM route...
381
Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry01:20

Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry

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Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...
171
Drug Delivery: Miscellaneous Routes01:22

Drug Delivery: Miscellaneous Routes

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Drug delivery methods like oral inhalation, nasal sprays, transdermal patches, eye drops, intravitreal injection,  and rectal administration provide localized effects with reduced toxicity.
Oral inhalation and nasal sprays swiftly transfer drugs across the respiratory epithelium's mucosal layer. Inhaled glucocorticoids and bronchodilators directly target lung conditions such as asthma, while fluticasone nasal spray mitigates allergic rhinitis.
Transdermal patches transport drugs...
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响应式Zwitterionic材料用于增强药物输送.

Ke Zheng1, Xumei Ouyang2, Hong Xie3

  • 1School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, China.

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概括

响应性zwiwterionic材料通过克服生物障碍,提供增强的抗瘤药物递送. 这些先进的材料响应内部信号,提高治疗效率和简化分子设计.

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科学领域:

  • 生物材料科学 生物材料科学
  • 纳米技术纳米技术
  • 药物输送系统 药物输送系统

背景情况:

  • 兹维特里昂材料以抗物质的特性而闻名,延长了纳米载体循环时间.
  • 经典的zwiterionic材料主要针对抗瘤药物输送中的血液循环障碍.
  • 多种生物障碍 (例如,瘤间歇压力,溶酶体障碍) 限制了传统纳米载体的效率.

研究的目的:

  • 审查对响应性兹威特子材料的最新进展,以克服抗瘤药物输送中的多种生物障碍.
  • 为了突出响应内源刺激而没有额外的响应群体的zwitterionic材料.
  • 讨论这些先进材料在癌症治疗中的前景和挑战.

主要方法:

  • 文献综述了响应性zwitterionic材料的近期进展.
  • 对响应pH值,温度,酶或活性氧物种的zwitterionic材料的分析.
  • 关于分子设计和刺激反应性的讨论.

主要成果:

  • 响应性zwiwterionic材料显示出克服多种生物障碍的潜力,不仅仅是防腐.
  • 这些材料可以被设计为响应特定的生物信号,增强有针对性的交付.
  • 内在的响应性简化了分子结构,保持了简单的合成.

结论:

  • 响应性zwiwterionic材料代表着对抗瘤药物输送的传统抗菌剂的显著进步.
  • 进一步研究响应性紫外线材料对于开发更有效的癌症疗法至关重要.
  • 这些材料提供了一个有前途的策略,以提高药物输送效率和减少副作用.