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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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Cellulose-metallothionein matrix for metal binding.

Naimat K Bari1, Shaswat Barua1, Ankush Garg1

  • 1Institute of Nano Science and Technology, Phase - 10, Sector - 64, Mohali, Punjab, India.

Carbohydrate Polymers
|April 26, 2018
PubMed
Summary

We developed a novel metal-binding matrix by covalently attaching metallothioneins to bacterial cellulose. This biocompatible conjugate shows enhanced metal binding and no toxicity, offering potential healthcare applications for metal toxicity management.

Keywords:
Bacterial celluloseCovalent conjugationEpoxidationMetal bindingMetallothionein

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Area of Science:

  • Biomaterials Science
  • Bioconjugation Chemistry
  • Nanotechnology

Background:

  • Bacterial cellulose (BC) is a biocompatible and biodegradable material with unique properties.
  • Metallothioneins (MTs) are physiological metal chelators with potential in metal detoxification.
  • Developing effective methods for conjugating proteins to BC is crucial for advanced biomaterial applications.

Purpose of the Study:

  • To create a novel metal-binding matrix by covalently conjugating metallothioneins to bacterial cellulose.
  • To investigate the efficacy of epoxy-amine conjugation chemistry for protein attachment to BC.
  • To evaluate the metal binding capacity, stability, and biocompatibility of the resulting conjugate.

Main Methods:

  • Bacterial cellulose (from Gluconobacter xylinus) hydroxyl groups were epoxidized.
  • Metallothioneins were covalently conjugated to the epoxidized BC via epoxy-amine chemistry.
  • Morphological, porosity, thermal stability, and metal binding capacity were analyzed.
  • Cytotoxicity was assessed using cellular metabolic and membrane integrity assays on MCF and HeLa cell lines.

Main Results:

  • A novel covalent protein-BC conjugation was achieved using epoxy-amine chemistry.
  • Up to 50% mass by mass of metallothionein was successfully attached to bacterial cellulose.
  • The modified BC exhibited altered morphology, porosity, and enhanced thermal stability.
  • A five-fold increase in metal binding capacity was observed compared to pristine BC.
  • The bacterial cellulose-metallothionein conjugate showed no significant toxicity to MCF and HeLa cells.

Conclusions:

  • The developed bacterial cellulose-metallothionein conjugate is a promising biomaterial for managing metal toxicity in healthcare.
  • The epoxy-amine conjugation strategy is effective for creating functional protein-cellulose matrices.
  • This approach can be extended to conjugate various other proteins for diverse biocompatible and biodegradable applications.