相关实验视频

Updated: Jun 14, 2025

Quantitative 31P NMR Analysis of Lignins and Tannins

Quantitative 31P NMR Analysis of Lignins and Tannins

Published on: August 2, 2021

红素结构特征及其抗氧化潜力:通过EPR,UV-Vis光谱和DPPH试验进行比较评估

Tina Ročnik Kozmelj¹, Maxim A Voinov², Miha Grilc¹

¹Department of Catalysis and Chemical Reaction Engineering, National Institute of Chemistry, Hajdrihova 19, 1001 Ljubljana, Slovenia.

International journal of molecular sciences

|August 29, 2024

概括

红素及其碎片表现出显著的抗氧化剂和自由基清除特性. 这项研究证实了它们在使用先进光谱方法的工业应用中的潜力.

科学领域:

聚合物化学聚合物化学
生物材料科学生物材料科学
分析化学分析化学

背景情况:

宁是一种天然的芳香聚合物,以其抗氧化特性而闻名.
利格宁衍生的寡聚物也显示出作为抗氧化剂的潜力.
了解它们的激进清理活动对于应用程序开发至关重要.

研究的目的:

评价分成的有机溶解木质素及其寡合碎片的抗氧化能力和自由基清除活性.
为了比较从电子磁共振 (EPR) 和UV-Vis光谱学获得的结果.
为了提供可靠的数据关于工业用途的素的抗氧化潜力.

主要方法:

采用了一种2,2-二-1-皮克里水 (DPPH) 试验.
采用电子磁共振 (EPR) 光谱法来测量自由基火.
应用UV-Vis光谱法来确定激素清除活性 (RSA).
分析了EPR数据,以推导动力速率常数.

主要成果:

素及其寡合体碎片都表现出显著的抗氧化活性.
EPR测量证实了由素有效地灭自由基.
紫外线-Vis光谱学提供了可比的RSA值,验证了EPR发现.
成功地获得了用于激素清理的动力速率常数.

结论:

分割的有机溶解性素及其寡合物具有显著的抗氧化和激素清除能力.
结合的EPR和UV-Vis光谱方法提高了抗氧化剂评估的可靠性.
氨酸衍生物在制药,食品防腐和化品领域的应用是有前途的.

关键词:

DPPH测试试剂的测试方法在EPR中使用EPR.抗氧化剂活性抗氧化剂活性素分数素分数素的寡聚物素的寡聚物器官溶液粉碎成粉末的方法

更多相关视频

Ultrafast Lignin Extraction from Unusual Mediterranean Lignocellulosic Residues

Ultrafast Lignin Extraction from Unusual Mediterranean Lignocellulosic Residues

Published on: March 9, 2021

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

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

Published on: January 7, 2019

相关概念视频

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given...