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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

906
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
1.8K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

438
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
438
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

542
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
542
Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

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The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
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相关实验视频

Updated: Jun 4, 2025

Development of Amelogenin-chitosan Hydrogel for In Vitro Enamel Regrowth with a Dense Interface
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一种新的双交联反应剂,用于丹丁结合界面稳定性.

Z L Tian1, H M Wang1, S H Yang1

  • 1Jilin Provincial Key Laboratory of Oral Biomedical Engineering, Hospital of Stomatology, Jilin University, Changchun, China.

Journal of dental research
|December 26, 2024
PubMed
概括

一种新的双交联试剂,FPA,通过交联原蛋白和抑制矩阵金属蛋白酶活性,有效地加强树脂-牙膜键,提高键的耐用性.

关键词:
一种类型I的原体.交叉连接试剂试剂的交叉连接牙粘合剂是一种牙粘合剂.牙科修复 修复 修复 牙科修复混合层 混合层 混合层矩阵金属蛋白酶抑制剂

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科学领域:

  • 生物材料科学 生物材料科学
  • 牙科材料科学 牙科材料科学
  • 聚合物化学 聚合物化学

背景情况:

  • 丁丁粘合程序需要耐用的接口来防止降解.
  • 牙中的矩阵金属蛋白酶 (MMP) 可以降解原蛋白,损害键的寿命.
  • 交叉连接试剂正在探索增强牙原蛋白稳定性和抑制MMPs.

研究的目的:

  • 为了合成和评估一个操作友好的双重交联试剂,3-(4-formyphenoxy)-2-hydroxypropyl methacrylate (FPA).
  • 评估FPA的交叉链接牙原蛋白的能力,并降低结合界面上的酶活性.
  • 评估FPA对树脂-丁结合物的耐用性和质量的影响.

主要方法:

  • 使用光谱学 (ATR-FTIR,UV-Vis) 和分子对接的FPA合成和表征.
  • 评估FPA-原相互作用,抗蛋白解和热解 (氧释放,TGA) 的耐药性.
  • 评估MMP抑制 (酶谱),细胞毒性 (CCK-8,活/死试验),结合强度和接口质量 (SEM,CLSM,水接触角度,纳米泄漏).

主要成果:

  • FPA成功地调解了与牙原蛋白的共价和键.
  • 用FPA处理的原体表现出对酶降解和热分解的增强抵抗力.
  • 在24小时和热循环后,FPA显著降低了粘合界面上的MMP活性,并改善了微拉伸键强度.
  • FPA处理改善了粘合接口质量,通过减少纳米泄漏和改变湿度来证明这一点.

结论:

  • 双重交叉连接试剂FPA在交叉连接牙原蛋白和抑制MMP活性方面是有效的.
  • FPA增强了树脂-牙键的寿命和质量,显示出显著的临床潜力.
  • FPA提供了一种有前途的策略,可以提高牙粘合剂修复的耐用性.