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相关概念视频

Hydrolysis01:15

Hydrolysis

105.3K
Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
105.3K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.3K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.3K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.8K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
7.8K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.5K
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...
2.5K
Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

1.8K
Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
1.8K
Preparation of Diols and Pinacol Rearrangement01:57

Preparation of Diols and Pinacol Rearrangement

3.4K
Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
3.4K

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相关实验视频

Updated: Jul 1, 2025

Extraction of Lignin with High &#946;-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield
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Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield

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酸盐催化了并列的酸脱聚合/聚合.

Nicolò Pajer1, Matteo Gigli1, Claudia Crestini1

  • 1Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, Mestre, Italy, 30135.

ChemSusChem
|March 12, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的方法,用于将技术性氨酸再循环转化为有价值的化合物和增强的聚合物材料. 该过程结合了溶剂分化与修改的细菌乳糖酶,以有效地增值素.

关键词:
酶催化酶的催化作用卡夫特林尼尼 (英语:Kraft lignin) 是一种有机制的制材料.拉卡斯 (Laccase) 是一个古老的城市.天然聚合物的天然聚合物.有机溶解的红素.氧化过程中的氧化.

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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Visualizing Lignification Dynamics in Plants with Click Chemistry: Dual Labeling is BLISS!
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Visualizing Lignification Dynamics in Plants with Click Chemistry: Dual Labeling is BLISS!

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Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield

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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Visualizing Lignification Dynamics in Plants with Click Chemistry: Dual Labeling is BLISS!
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科学领域:

  • 生物技术是生物技术.
  • 聚合物科学 聚合物科学
  • 绿色化学 绿色化学

背景情况:

  • 技术素是丰富的生物聚合物,具有工业上循环的潜力.
  • 目前用于素价值化的方法往往缺乏效率或选择性.
  • 制定高价值生产和材料提升的战略至关重要.

研究的目的:

  • 开发一种联合的溶剂分化和酶氧化策略,用于技术性素上循环.
  • 为了实现高产,选择性分离素单体化合物 (MCs) 和聚合材料 (PMs).
  • 根据所得到材料的特性,如分子量和疏水性,进行定制.

主要方法:

  • 以溶剂为基础的分化与转基因细菌乳酶的氧化作用的结合.
  • 优化反应条件 (温度,时间,酶负载,性) 以进行选择性单体生成.
  • 来自软木 kraft 质素 (SKL) 和小麦有机溶解质素 (WSL) 的分离单体化合物和聚合材料的表征.

主要成果:

  • 高产率 (高达17.2 mg/g) 和选择性分离有价值的素单体化合物 (MCs).
  • 聚合材料 (PM) 的分子量 (Mw) 显著增加:SKL几乎增加了四倍,WSL增加了两倍.
  • 在酶催化氧化后,在技术性素,分离物和PM中表现出增加的疏水性.

结论:

  • 提出的战略有效地实现了生产高价值和技术基因增强材料的双重目标.
  • 基于乳糖酶的优化方法为高效和选择性的素上循环提供了一个有前途的途径.
  • 衍生材料的增强疏水性扩大了它们的潜在应用.