相关实验视频

Updated: May 11, 2025

A Package of Established Analytical Tools to Investigate the Solid-State Alteration of Lipid-Based Excipients
11:27

A Package of Established Analytical Tools to Investigate the Solid-State Alteration of Lipid-Based Excipients

Published on: August 9, 2022

1.9K

抗药克洛巴萨姆的无形状态:制备和表征

Marina M Marcos Valdez1, Julio Sanchez2, María E Bertotto3

  • 1Facultad de Ciencias Químicas, Departamento de Ciencias Farmacéuticas y Unidad de Investigación y Desarrollo en Tecnología Farmacéutica (UNITEFA)-Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET), Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, X5000HUA, Argentina.

AAPS PharmSciTech
|April 17, 2025
PubMed
概括

已经成功地制备和表征了无形的克洛巴萨姆 (CLOB). 然而,在各种压力条件下,这种无形形式很容易恢复到其晶体状态,这表明它没有明显的物理稳定性优势,而不是晶体CLOB.

关键词:
1,5-二西平类药物是什么在X射线光电子光谱学中使用X射线光电子光谱.传统的和模块化的DSC.进行脱化,使其脱化.动态机械分析机械分析

更多相关视频

Preparation of Acute Human Hippocampal Slices for Electrophysiological Recordings07:31

Preparation of Acute Human Hippocampal Slices for Electrophysiological Recordings

Published on: May 7, 2020

7.1K
Electrophoretic Delivery of γ-aminobutyric Acid GABA into Epileptic Focus Prevents Seizures in Mice07:01

Electrophoretic Delivery of γ-aminobutyric Acid GABA into Epileptic Focus Prevents Seizures in Mice

Published on: May 16, 2019

8.9K

相关概念视频

Preparation of Amides01:29

Preparation of Amides

Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
2.9K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
3.1K
Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism

Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
246
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
3.4K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
3.4K
Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
3.8K