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Engineering calcium peroxide based oxygen generating scaffolds for tissue survival.

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Oxygen-generating scaffolds using calcium peroxide (CaO2) and polycaprolactone (PCL) improve cell survival in tissue engineering. These novel biomaterials provide a sustained oxygen supply, overcoming hypoxia challenges during construct development.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Biomedical Engineering

Background:

  • Oxygen supply is critical for engineered tissues but host vascularization takes weeks, leading to cell death from hypoxia.
  • Current tissue constructs face oxygen deprivation, cellular dysfunction, and necrosis during development.

Purpose of the Study:

  • To develop and evaluate oxygen-generating scaffolds using calcium peroxide (CaO2) and polycaprolactone (PCL) to sustain cell viability.
  • To investigate the physiochemical properties and oxygen release kinetics of these novel biomaterials.

Main Methods:

  • Fabrication of polycaprolactone (PCL) scaffolds loaded with varying concentrations of calcium peroxide (CaO2).
  • In vitro assessment of oxygen release, mechanical properties, swelling, and degradation over 35 days.
  • Encapsulation of NIH/3T3 fibroblasts, L6 rat myoblasts, and cardiac fibroblasts to evaluate cell survival, proliferation, and function under hypoxic conditions.

Main Results:

  • Scaffolds demonstrated predictable oxygen release, achieving 5%–29% dissolved oxygen with increasing CaO2 loading.
  • Mechanical strength ranged from 5–20 kPa, with controlled swelling (22%–33%) and degradation rates.
  • Encapsulated cells showed enhanced survival, proliferation, and function under hypoxia, with scaffolds maintaining a stable pH (8–9).

Conclusions:

  • Oxygen-generating scaffolds offer a promising solution to overcome hypoxia in tissue engineering.
  • These CaO2-PCL biomaterials support cell viability and function, paving the way for clinically translatable tissue constructs.