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Updated: Jan 20, 2026

Evaluation of Oxidative Stress in Biological Samples Using the Thiobarbituric Acid Reactive Substances Assay
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Chitosan-Thiobarbituric Acid: A Superadsorbent for Mercury.

Rahul Bhatt1, Shilpi Kushwaha2, Sreedhar Bojja3

  • 1Department of Chemistry, Faculty of Science, M. S. University of Baroda, Sayajigunj, Vadodara 390002, Gujarat, India.

ACS Omega
|August 29, 2019
PubMed
Summary

Chitosan-thiobarbituric acid (CT) effectively removes mercury species. This novel adsorbent demonstrates high adsorption capacities and reusability for elemental mercury, inorganic mercury, and methyl mercury.

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Mercury contamination poses significant environmental and health risks.
  • Effective removal of diverse mercury species (elemental, inorganic, methyl) is crucial.
  • Developing novel, high-capacity adsorbents is a key research area.

Purpose of the Study:

  • To synthesize and characterize a novel chitosan-based adsorbent (CT).
  • To investigate the adsorption potential of CT for elemental mercury (Hg0), inorganic mercury (Hg2+), and methyl mercury (CH3Hg+).
  • To evaluate the reusability of the CT adsorbent.

Main Methods:

  • Supramolecular cross-linking of chitosan with thiobarbituric acid to form CT.
  • Comprehensive characterization using UV-Vis, SEM-EDX, FTIR, NMR, DSC, TGA, and XRD.
  • Mercury adsorption experiments with optimization of parameters and isotherm modeling (Langmuir, Freundlich, Temkin).

Main Results:

  • CT exhibited high adsorption capacities: 1357.69 mg/g for Hg0, 2504.86 mg/g for Hg2+, and 2475.38 mg/g for CH3Hg+.
  • Adsorption data fitted well with Langmuir, Freundlich, and Temkin isotherm models.
  • The CT adsorbent was successfully reused for up to three cycles with specific elution solutions.

Conclusions:

  • Chitosan-thiobarbituric acid (CT) is a highly effective adsorbent for various mercury species.
  • CT offers superior adsorption capacities compared to many existing materials.
  • The adsorbent's reusability highlights its potential for practical mercury remediation applications.