Video Experimental Relacionado
Updated: May 2, 2026
09:57
A Facile and Efficient Approach for the Production of Reversible Disulfide Cross-linked Micelles
Published on: December 23, 2016
8.3K
Micelas de polímero que contienen telurio: sistemas competitivos y regulados de coordinación de ligandos y sistemas
Wei Cao1, Yuwei Gu, Myriam Meineck
1Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University , Beijing 100084, China .
Journal of the American Chemical Society
|March 11, 2014
Resumen
Los investigadores desarrollaron un nuevo polímero que contiene telurio para la administración controlada de medicamentos. Este nanomaterial permite la liberación sintonizable de medicamentos a base de platino a través de la coordinación competitiva, ofreciendo una nueva plataforma para aplicaciones biomédicas.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química de Polímeros La Química de Polímeros es la química de los polímeros.
- Nanotecnología La nanotecnología es la nanotecnología.
- Ingeniería Biomédica Ingeniería Biomédica.
Sus antecedentes:
- La liberación de carga ajustable de los nanomateriales es crucial para la administración de medicamentos.
- Se necesitan nuevos materiales para ampliar las opciones de los sistemas de liberación controlada.
- El telurio no ha sido explorado previamente en polímeros solubles en agua para la administración de medicamentos.
Objetivo del estudio:
- Introducir un nuevo polímero que contiene telurio para aplicaciones de administración de fármacos.
- Establecer un sistema de coordinación competitivo para la carga y liberación de drogas basadas en platino.
- Para demostrar el control regulado por ligandos sobre la cinética de liberación de fármacos.
Principales métodos:
- Síntesis de un nuevo polímero soluble en agua que contiene telurio.
- Diseño de un sistema químico de coordinación que utiliza las interacciones platino-telurio para la carga de fármacos.
- Investigación de la coordinación competitiva con biomoléculas para la liberación de fármacos.
- Modulación de la cinética de liberación utilizando varios ligandos competitivos con diferentes capacidades de coordinación.
Principales resultados:
- Introducción exitosa de telurio en polímeros solubles en agua para la administración de medicamentos.
- Demostración de la carga de drogas a base de platino a través de la coordinación platino-telurio.
- Lograr la liberación controlada de fármacos a través de la coordinación competitiva con las biomoléculas.
- Se mostró la cinética de liberación sintonizable mediante la alteración de ligandos competitivos.
Conclusiones:
- El nuevo polímero que contiene telurio representa una nueva clase de vehículos de administración de fármacos.
- El sistema de coordinación competitivo permite la liberación de fármacos sintonizables regulados por ligandos.
- Esta plataforma ofrece potencial para nanotecnologías biomédicas avanzadas.
Videos de Conceptos Relacionados
00:43Complexometric Titration: Ligands
2.5K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
2.5K
02:51Metal-Ligand Bonds
19.3K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
19.3K
01:19Complexation Equilibria: The Chelate Effect
1.7K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.7K
01:22EDTA: Chemistry and Properties
4.1K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
4.1K
02:52Stereoisomerism
11.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.1K
02:42Valence Bond Theory
8.9K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.9K