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Drug Delivery: Overview01:16

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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.
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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.
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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.
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Changes in polymorphic forms can significantly influence the bioavailability of poorly soluble drugs. Although the FDA defines pharmaceutical equivalence based on having the same active ingredient, dosage form, and route of administration, it does not automatically disqualify products with different polymorphic forms. This means two products with different polymorphs can still be deemed pharmaceutically equivalent. However, polymorphic differences can affect properties like wettability,...
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The enteral drug administration involves three primary routes: oral, sublingual, and buccal. Oral ingestion is the most prevalent, safe, economical, and convenient method for drug administration. However, it has certain drawbacks, including limited absorption due to the drug's low water solubility or poor membrane permeability, possible emesis from GI mucosa irritation, destruction of drugs by digestive enzymes or low gastric pH, and irregular absorption along with food or other drugs.
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一个非抗原性随机聚乙烯糖/聚二二氧化) 基药物输送平台.

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随机聚乙烯甘醇 (rPEG) 在纳米医学中为传统的PEG提供了一个非抗原替代品. 这种新材料形成了具有高药载荷能力和降低抗体反应的聚合物微粒,提高了纳米医药的安全性和有效性.

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科学领域:

  • 纳米医学是一种纳米医学.
  • 聚合物化学 聚合物化学
  • 生物材料科学 生物材料科学

背景情况:

  • 聚乙烯甘醇 (PEG) 由于其隐形性质在纳米医学中至关重要,但抗PEG抗体 (APAs) 限制了其使用.
  • 开发PEG替代品对于克服免疫性问题和确保纳米药物的安全性和有效性至关重要.

研究的目的:

  • 开发和描述一种使用随机PEG (rPEG) 和聚二二氧化 (PPheOzi) 的新型非抗原聚合物微粒平台.
  • 评估基于rPEG的菌体的药物负载能力和临床前安全概况.
  • 评估与传统PEG相比,rPEG的抗原性降低.

主要方法:

  • 通过环开聚合合成合成rPEG和PPheOzi.
  • 组装ABA类型的triblock共聚合物 (rPEG-b-PPheOzi-b-rPEG) 和对聚合物微粒 (PMs) 的表征.
  • 使用Efavirenz的药物加载研究和使用细胞系和PBMCs的临床前安全评估.
  • 使用竞争性酶链免疫吸收试验 (ELISA) 评估APA结合亲和力.

主要成果:

  • 用rPEG和PPheOzi形成的聚合物微粒显示出对Efavirenz具有可调节的药物载荷能力.
  • 临床前安全性评估显示,在小鼠纤维细胞和人类PBMC中没有显著的毒性.
  • 与PEG相比,竞争性ELISA揭示了与rPEG相比,对rPEG的APA亲和力显著降低.

结论:

  • rPEG和PPheOzi的组合创造了一个具有高药物载荷能力的非抗原性菌根平台.
  • 这种新的平台解决了PEG免疫性限制,为纳米医学应用提供了更安全的替代方案.
  • 基于rPEG的菌体在提高药物输送系统的安全性和有效性方面表现有前途.