Related Experiment Video
Updated: Jul 14, 2026
10:33
Generation of Alginate Microspheres for Biomedical Applications
Published on: August 12, 2012
[Study on the interaction between alginic sodium diester and azur A and the application]
Yong-ming Liu1, Gui-zhi Li, Fei Pan
1Chemical College of Yantai University, Yantai 264005, China. yongming_liu@163.com
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|May 23, 2007
Summary
A new method determines alginic sodium diester (ASD) by monitoring the fading of azur A (AA) due to complex formation. This sensitive technique offers accurate ASD quantification in pharmaceutical formulations.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Materials Science
Context:
- Investigating the molecular interactions between alginic sodium diester (ASD) and azur A (AA).
- Exploring the impact of varying pH and molar ratios on the spectral properties of the ASD-AA system.
- Utilizing absorption spectroscopy to probe complex formation dynamics.
Purpose:
- To elucidate the binding characteristics between alginic sodium diester and azur A.
- To develop a novel analytical method for the quantitative determination of alginic sodium diester.
- To establish the binding number and equilibrium constant for the ASD-AA interaction.
Summary:
- The study characterized the interaction between alginic sodium diester (ASD) and azur A (AA) using absorption spectra, analyzing the effects of pH and molar ratio.
- A theoretical model yielded a maximum binding number (N = 168) and binding equilibrium constant (K = 3.25 x 10^6).
- A new, sensitive method for ASD determination was developed based on the color fading of AA upon forming an ASD-AA ion-association complex, with a detection limit of 0.009 µg/mL.
Impact:
- The developed method provides a simple, accurate, and selective approach for ASD determination.
- The method demonstrates stability and satisfactory results when applied to the analysis of ASD in tablet formulations.
- This research contributes a valuable analytical tool for quality control and research involving alginic sodium diester.
Related Concept Videos
01:11Aryldiazonium Salts to Azo Dyes: Diazo Coupling
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
01:22Preparation 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...
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...
01:14Alkylation of β-Diester Enolates: Malonic Ester Synthesis
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.