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Related Concept Videos

EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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...
Affinity and Avidity01:41

Affinity and Avidity

Overview
Essential Minerals for Bone Health01:31

Essential Minerals for Bone Health

The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

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Related Experiment Video

Updated: May 9, 2026

Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation
14:46

Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation

Published on: January 20, 2018

Valency-dependent affinity of bioactive hydroxyapatite-binding dendrons.

Wen Tang1, Yanrui Ma, Sibai Xie

  • 1Department of Polymer Science, The University of Akron, Akron, Ohio 44325, United States.

Biomacromolecules
|August 13, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed multivalent hydroxyapatite (HA)-binding peptides to precisely control biomolecule attachment. Tetravalent constructs show a 100-fold increase in HA binding affinity, enabling advanced applications in biomaterials and tissue engineering.

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Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation
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Published on: January 20, 2018

Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
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Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications

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Synthesis of Graphene-Hydroxyapatite Nanocomposites for Potential Use in Bone Tissue Engineering
07:14

Synthesis of Graphene-Hydroxyapatite Nanocomposites for Potential Use in Bone Tissue Engineering

Published on: July 27, 2022

Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Biotechnology

Background:

  • Hydroxyapatite (HA) surfaces are crucial for protein purification, implants, and tissue engineering.
  • Controllable functionalization of HA surfaces with biomolecules remains a challenge for advanced applications.

Purpose of the Study:

  • To synthesize and characterize multivalent HA-binding peptide bioconjugates with tunable valency and tether length.
  • To precisely control biomolecule binding behavior on HA surfaces.

Main Methods:

  • Synthesis of multivalent HA-binding peptide bioconjugates.
  • Characterization of binding affinities using quartz crystal microbalance with dissipation monitoring (QCM-D).

Main Results:

  • A clear relationship between dendron structure and HA binding affinity was established.
  • Tetravalent HA-binding peptide constructs demonstrated a 100-fold enhancement in binding affinity.
  • Successful conjugation of biotin and a bone morphogenic protein-2 (BMP-2) derivative peptide was achieved.

Conclusions:

  • Multivalent peptide bioconjugates offer precise control over HA surface functionalization.
  • Enhanced binding affinity opens new avenues for HA-based biomaterials and therapeutic delivery systems.