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Related Concept Videos

EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

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...
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...
EDTA: Indirect and Alkalimetric Titration01:23

EDTA: Indirect and Alkalimetric Titration

Unlike direct titration, back-titration, and displacement titration, indirect titration is an EDTA titration method for quantifying anions. In the indirect titration method, anions are precipitated as their insoluble salts with excess metal ions. The filtrate containing the excess metal ions is directly titrated with standard EDTA until the endpoint is achieved. Another approach involves extracting the metal ion and back-titrating with standard EDTA to obtain the endpoint. In this way, the...
Complexometric EDTA Titration Curves01:20

Complexometric EDTA Titration Curves

EDTA titration curves determine the free metal ion concentration. The titration curve represents the change in concentration of free metal ions (p function) as a function of the volume of EDTA added. This curve consists of three regions: before, at, and after equivalence points. Excess free metal ions are present before the equivalence point. Equal concentrations of metal ions and EDTA are present at the equivalence point. After the equivalence point, excess EDTA exists. This means slight...
Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a result, EDTA...
EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides and...

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Related Experiment Video

Updated: May 11, 2026

Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
05:41

Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications

Published on: February 23, 2017

Hydroxyapatite synthesis using EDTA.

Nak Heon Kang1, Soon Je Kim, Seung Han Song

  • 1Department of Plastic & Reconstructive Surgery, College of Medicine, Chungnam National University, Daejeon, Korea.

The Journal of Craniofacial Surgery
|May 30, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a new, cost-effective method to synthesize hydroxyapatite, a bone graft material. This convenient process yields a product with superior cell growth compared to traditional bone allografts.

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Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect
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Last Updated: May 11, 2026

Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
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Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect
09:35

Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect

Published on: September 11, 2015

Area of Science:

  • Biomaterials Science
  • Orthopedic Research
  • Biotechnology

Background:

  • Bone defects from trauma, cancer, or disease necessitate bone grafts.
  • Allografts offer an alternative to autologous bone grafts.
  • Hydroxyapatite (Ca10(PO4)6(OH)2) is a promising bone graft material, but its production is costly and time-consuming.

Purpose of the Study:

  • To develop a novel, economical, and convenient synthesis method for hydroxyapatite.
  • To evaluate the physicochemical properties and biocompatibility of synthesized hydroxyapatite.
  • To compare the synthesized hydroxyapatite with freeze-dried bone allograft (control).

Main Methods:

  • Hydroxyapatite was synthesized using EDTA at room temperature and low pressure.
  • Physicochemical characterization included X-ray diffraction (XRD) and microscopy.
  • Cellular studies assessed cell growth and alkaline phosphatase activity using freeze-dried bone allograft as a control.

Main Results:

  • Synthesized hydroxyapatite presented as rod-shaped particles (2-5 μm length, 0.5-1 μm width).
  • XRD analysis confirmed a substance similar to freeze-dried bone allograft.
  • Synthesized hydroxyapatite exhibited 1.5-fold greater cell growth and comparable alkaline phosphatase activity after 3 days compared to the control.

Conclusions:

  • A new, convenient, and scalable method for hydroxyapatite synthesis was established.
  • The synthesized hydroxyapatite demonstrates excellent biocompatibility and potential for bone defect repair.
  • This method facilitates large-scale production and scaffold fabrication for future medical applications.