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相关概念视频

Proton (¹H) NMR: Chemical Shift01:07

Proton (¹H) NMR: Chemical Shift

3.5K
Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei...
3.5K
¹H NMR of Labile Protons: Temporal Resolution01:10

¹H NMR of Labile Protons: Temporal Resolution

1.7K
Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
1.7K
¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

¹H NMR of Labile Protons: Deuterium (²H) Substitution

1.4K
This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
1.4K
Types of Genetic Transfer Between Organisms02:18

Types of Genetic Transfer Between Organisms

31.0K
Genetic transfer occurs when genetic information is passed from one organism to another. It occurs via two mechanisms: vertical gene transfer and horizontal gene transfer. Vertical gene transfer occurs when genetic information is transferred from one generation to the next, which happens much more frequently than horizontal gene transfer. Both sexual and asexual reproduction are forms of vertical gene transfer, where one or more organisms pass some or all of their genome onto their progeny.
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Transfer RNA Synthesis02:36

Transfer RNA Synthesis

13.4K
One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
13.4K
¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons

4.2K
Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
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Updated: Feb 10, 2026

Fragmenting Bulk Hydrogels and Processing into Granular Hydrogels for Biomedical Applications
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质子转移水凝:多功能性和应用

JiHyeon Hwang1, Dong G Lee1, Hyunki Yeo1

  • 1Department of Chemical and Biological Engineering , Korea University , Seoul , 02841 , South Korea.

Journal of the American Chemical Society
|May 17, 2018
PubMed
概括

这项研究提出了一种多功能氧化物聚合,用于制造可调节的水凝. 这些可适应的水凝具有生物相容性,并可用于抗菌性质,展示其广泛的应用潜力.

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科学领域:

  • 聚合物化学
  • 材料科学
  • 生物材料工程

背景情况:

  • 水凝是具有多样性的重要生物材料.
  • 开发可适应和可调节的水凝合成方法对于先进的材料设计至关重要.
  • 现有的方法在聚合条件,前体或合成后的修改中可能缺乏多功能性.

研究的目的:

  • 证明硫醇和环氧化物的质子转移聚合是一种多用途的水凝合成方法.
  • 通过前体选择和聚合条件来探索水凝的可调性.
  • 调查功能化潜力和由此产生的材料特性,包括抗菌性质.

主要方法:

  • 在醇和环氧功能组之间利用质子转移聚合.
  • 探索各种聚合催化剂 (有机/无机) 和介质 (水,缓冲剂,有机溶剂).
  • 研究的不同凝触发因素:环境条件,37°C和光 (光化学).
  • 采用纳米印记光刻技术制作图案片.
  • 在凝后功能化乙烯基组以创建离子结构.

主要成果:

  • 在各种条件下通过氧化物聚合实现了可适应的水凝合成.
  • 通过选择前体和条件,证明了吸水,机械和生物降解性能.
  • 通过环境和光化学方法成功生产独立的图案厚薄膜.
  • 通过化后的功能化来制造抗菌水凝,以硫为基础的阴离子结构.
  • 在原始凝中观察到生物相容性和非粘合性,促进癌细胞集群的形成.

结论:

  • 硫醇和环氧化物的质子转移聚合是一种高度适应和实用性的水凝合成方法.
  • 该方法可以精确控制水凝的特性,并引入特定的功能,如抗菌活性.
  • 由此产生的生物相容和可调节的水凝有望用于各种生物医学应用,包括组织工程和药物输送.