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相关概念视频

Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.2K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
3.2K
Matrix-Assisted Laser Desorption Ionization (MALDI)01:08

Matrix-Assisted Laser Desorption Ionization (MALDI)

269
Matrix-assisted laser desorption ionization (MALDI) is a powerful analytical technique used in mass spectrometry. It enables the identification and characterization of various biomolecules, including proteins, peptides, nucleic acids, and carbohydrates. MALDI spectrometry is widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.
The analyte of interest, a biomolecule or a mixture of biomolecules, is mixed with a suitable matrix material. The...
269
Polymers: Defining Molecular Weight01:01

Polymers: Defining Molecular Weight

2.8K
Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight.  So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...
2.8K
Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

1.1K
An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a low-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.
To...
1.1K

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Ultrafast Lignin Extraction from Unusual Mediterranean Lignocellulosic Residues
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通过分散分析估计林格宁摩尔质量.

Tor I Simonsen1, Demi T Djajadi1, Andrea Ponzecchi1

  • 1Department of Geosciences and Natural Resource Management, University of Copenhagen, Frederiksberg C, Copenhagen, 1958, Denmark.

Macromolecular rapid communications
|January 22, 2025
PubMed
概括

泰勒分散分析 (TDA) 显示出确定素大小的前景,提供快速测量,无需静态相相互作用. 这种方法,特别是流量诱导分散分析 (FIDA),提供了与其他素表征技术相比较的结果.

关键词:
泰勒分散分析 (TDA) 是一种分析方法.扩散顺序光谱法 (DOSY) 是一种扩散顺序光谱法.流量诱导的分散分析 (FIDA)水力动力半径的水力动力半径尺寸排除色谱 (SEC) 是一种尺寸排除色谱.

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科学领域:

  • 生物质的价值化 生物质的价值化
  • 聚合物科学 聚合物科学
  • 分析化学 分析化学

背景情况:

  • 宁的复杂结构阻碍了准确的摩尔质量确定,这对于其工业应用至关重要.
  • 像SEC和DOSY NMR这样的现有方法在速度或复杂性方面存在局限性.

研究的目的:

  • 评估泰勒分散分析 (TDA) 用于测量素大小.
  • 为了比较基于TDA的方法与大小排除染色学 (SEC) 和扩散顺序光谱学 (DOSY) 的NMR.

主要方法:

  • 利用流量诱导分散分析 (FIDA),一种基于TDA的技术,具有双高斯拟合.
  • 应用摩尔质量校准用于比较分析.
  • 分析了用溶剂分离的苏打草木质素样本.

主要成果:

  • FIDA成功地确定了多种素物种的平均水力动力半径.
  • FIDA的结果显示与DOSY的NMR一致.
  • 在FIDA和SEC之间进行的比较显示,在素分数方面存在相似的相对差异.

结论:

  • FIDA是一种可行的法,用于对素大小进行估计,提供快速分析,避免静态相相互作用.
  • 目前,宁光变异性限制了FIDA的准确性.
  • 需要进一步改进,以克服局限性并推进FIDA用于素表征.