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Videos de Conceptos Relacionados

Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

1.7K
Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
1.7K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.0K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.0K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.4K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.4K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

1.9K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
1.9K
Radical Reactivity: Electrophilic Radicals01:02

Radical Reactivity: Electrophilic Radicals

1.8K
Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
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Free Radicals in Chemical Biology: from Chemical Behavior to Biomarker Development
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Free Radicals in Chemical Biology: from Chemical Behavior to Biomarker Development

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Polimerizaciones radicales intracelulares mediadas por bacterias

Eleonora Ornati1,2, Jules Perrard1, Tobias A Hoffmann1

  • 1Department of Chemistry and Centre for Synthetic Biology, Technical University of Darmstadt, Peter-Grünberg-Str. 4, 64287 Darmstadt, Germany.

Journal of the American Chemical Society
|March 4, 2025
PubMed
Resumen

Las células bacterianas ahora pueden sintetizar polímeros dentro de sí mismas utilizando la polimerización radical de transferencia atómica. Este método bioortogonal crea polímeros compatibles con las células y abre nuevas vías para la biología sintética y la ingeniería celular.

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Área de la Ciencia:

  • Biología sintética
  • Química de los polímeros
  • Microbiología

Sus antecedentes:

  • La síntesis intracelular de polímeros sintéticos es un reto.
  • La polimerización bioortogonal ofrece una ruta a las células modificadas por polímeros.
  • Las células bacterianas presentan potencial como fábricas de polímeros vivos.

Objetivo del estudio:

  • Para demostrar la polimerización de radicales intracelulares en Escherichia coli.
  • Para investigar la compatibilidad celular de este proceso de polimerización.
  • Explorar el uso de células bacterianas como plataformas de síntesis de polímeros bioortogonales.

Principales métodos:

  • Iniciación de la polimerización mediante la reacción radical de transferencia de átomos provocada por las biomoléculas.
  • Confirmación de la polimerización intracelular mediante espectroscopia de RMN, GPC y etiquetado por fluorescencia.
  • Evaluación de la viabilidad celular, el comportamiento y la integridad de la membrana mediante microscopía, citometría de flujo y ensayos metabólicos.

Principales resultados:

  • Escherichia coli inició con éxito la polimerización de varios monómeros intracelulares.
  • Los polímeros sintetizados fueron compatibles con las células, manteniendo una alta viabilidad celular.
  • Los tintes fluorescentes se incorporaron a los polímeros sintetizados en celuloide.

Conclusiones:

  • Las células bacterianas pueden actuar como catalizadores vivos para la producción de polímeros.
  • La polimerización radical de transferencia atómica intracelular es una herramienta bioortogonal viable.
  • Este enfoque avanza en las aplicaciones de ingeniería celular y biología sintética.