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Fast Reactions01:27

Fast Reactions

9
Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...
9
Methods for Studying Drug Absorption: In vitro01:16

Methods for Studying Drug Absorption: In vitro

847
In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
The diffusion cell method uses a two-compartment cell, including a donor compartment with the drug solution, which simulates the environment where the drug is applied, and a receptor compartment with a buffer solution, which simulates the environment...
847
Phase I Reactions: Reductive Reactions01:27

Phase I Reactions: Reductive Reactions

806
Phase I biotransformation reductive reactions are chemical processes that modify drugs by introducing or revealing polar functional groups via reduction. Enzymes called reductases catalyze these reactions, playing a pivotal role in drug metabolism by transforming lipophilic drugs into more polar, water-soluble metabolites for easy excretion. An essential type of reductive reaction is the carbonyl group reduction, where aldehydes and ketones are reduced to alcohols. An example is the...
806
In Vitro Drug Dissolution: Compendial Testing Models I01:13

In Vitro Drug Dissolution: Compendial Testing Models I

584
Compendial dissolution methods are standardized procedures defined by pharmacopeias to evaluate the rate at which a drug dissolves in a specific medium. These methods ensure batch-to-batch consistency, enable quality control, and support the prediction of drug bioavailability. They are critical for both immediate and modified-release drug products.The apparatuses used for dissolution testing differ in their design and mechanical function, but all aim to simulate the physiological environment of...
584
In Vitro Drug Dissolution: Compendial Testing Models II01:09

In Vitro Drug Dissolution: Compendial Testing Models II

694
Various dissolution methods are utilized to assess a drug’s dissolution rate, including the flow-through cell, paddle-over-disk, cylinder, and reciprocating disk methods.The flow-through cell apparatus (USP (United States Pharmacopeia) method 4) comprises a reservoir for the dissolution medium and a pump that propels the medium through the cell containing the test sample. This method is crucial for assessing modified-release dosage forms with minimally soluble active ingredients,...
694
In Vitro Drug Dissolution: Alternative Methods01:17

In Vitro Drug Dissolution: Alternative Methods

389
Alternative drug dissolution methods include the rotating bottle, intrinsic dissolution test, peristalsis, and the Franz diffusion cell method. The rotating bottle method involves meticulously rotating tightly capped controlled-release beads in a temperature-controlled bath. Periodic decanting of samples allows for residue assay, followed by refilling with fresh medium and testing at various pH levels to emulate the gastrointestinal tract conditions.In contrast, the intrinsic dissolution test...
389

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試料を錠剤で簡素化する

Buddhisha Udugama1, Pranav Kadhiresan1, Amila Samarakoon1

  • 1Institute of Biomaterials and Biomedical Engineering, ‡Terrence Donnelly Centre for Cellular and Bimolecular Research, §Department of Chemistry, ∥Department of Chemical Engineering, and ⊥Department of Materials Science and Engineering, University of Toronto , 160 College Street, Toronto, Ontario, Canada M5S 3E1.

Journal of the American Chemical Society
|November 28, 2017
PubMed
まとめ
この要約は機械生成です。

複雑な検査を簡素化し 冷蔵庫なしで 遠隔地での使用を可能にしました このイノベーションにより 医療診断のアクセシビリティが 世界的に向上します

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科学分野:

  • バイオテクノロジー
  • 医療診断
  • アッセイ開発

背景:

  • 現在の医学的診断検査は高感度ですが,しばしば複雑な手順,専門職,熱感度の高い反応剤の冷蔵が必要です.
  • 冷却と多段階のプロセスの必要性は,特に資源の限られた環境で,高度な診断ツールの展開を制限します.

研究 の 目的:

  • 安定した,事前測定された診断用反応剤の製造のための高通量圧縮方法を開発する.
  • このタブレット技術が様々な診断試験に 応用可能で臨床的準備ができていることを示す.

主な方法:

  • 新しい高通量圧縮技術を使用して,アッセイ成分をカラーコード付きタブレットにカプセル化しました.
  • タブレット内の熱感反応剤の安定性を評価した.
  • タブレット診断は,同熱核酸増強,酵素ベースの免疫測定,およびマイクロビーズ診断を含むさまざまな測定に適用されました.
  • 臨床準備は,B型肝炎陽性患者のサンプルを,錠剤検査でスクリーニングすることによって評価した.

主要な成果:

  • 錠剤製法により,熱に敏感な反応剤を安定させ,測定の準備を簡素化することができました.
  • この技術は,核酸増強と免疫測定を含むさまざまな診断用途において有効であることが証明されました.
  • タブレット診断は,B型肝炎のスクリーニングにおいて臨床的有用性を示し,安定性と使いやすさを示した.
  • この方法は,冷蔵庫と複雑な処理手順の必要性を排除します.

結論:

  • 診断用反応剤の錠剤は,繊細な材料を安定させ,複雑な測定を簡素化するための堅固な解決策を提供します.
  • この技術は,冷却の要件や特殊な搬送などの物流上の障壁を大幅に軽減します.
  • 開発された方法は,特に遠隔地またはサービス不足の地域で,先進的な医療診断のアクセシビリティと導入能力を高めます.